710 lines
22 KiB
XML
710 lines
22 KiB
XML
<?xml version="1.0"?>
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<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
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<!-- Do not modify this file directly. Instead, copy entries that you -->
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<!-- wish to modify from this file into hdfs-site.xml and change them -->
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<!-- there. If hdfs-site.xml does not already exist, create it. -->
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<configuration>
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<property>
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<name>dfs.namenode.logging.level</name>
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<value>info</value>
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<description>The logging level for dfs namenode. Other values are "dir"(trac
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e namespace mutations), "block"(trace block under/over replications and block
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creations/deletions), or "all".</description>
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</property>
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<property>
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<name>dfs.namenode.rpc-address</name>
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<value></value>
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<description>
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RPC address that handles all clients requests. If empty then we'll get the
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value from fs.default.name.
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The value of this property will take the form of hdfs://nn-host1:rpc-port.
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</description>
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</property>
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<property>
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<name>dfs.secondary.http.address</name>
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<value>0.0.0.0:50090</value>
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<description>
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The secondary namenode http server address and port.
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If the port is 0 then the server will start on a free port.
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</description>
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</property>
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<property>
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<name>dfs.datanode.address</name>
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<value>0.0.0.0:50010</value>
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<description>
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The datanode server address and port for data transfer.
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If the port is 0 then the server will start on a free port.
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</description>
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</property>
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<property>
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<name>dfs.datanode.http.address</name>
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<value>0.0.0.0:50075</value>
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<description>
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The datanode http server address and port.
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If the port is 0 then the server will start on a free port.
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</description>
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</property>
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<property>
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<name>dfs.datanode.ipc.address</name>
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<value>0.0.0.0:50020</value>
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<description>
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The datanode ipc server address and port.
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If the port is 0 then the server will start on a free port.
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</description>
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</property>
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<property>
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<name>dfs.datanode.handler.count</name>
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<value>3</value>
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<description>The number of server threads for the datanode.</description>
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</property>
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<property>
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<name>dfs.http.address</name>
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<value>0.0.0.0:50070</value>
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<description>
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The address and the base port where the dfs namenode web ui will listen on.
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If the port is 0 then the server will start on a free port.
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</description>
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</property>
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<property>
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<name>dfs.https.enable</name>
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<value>false</value>
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<description>Decide if HTTPS(SSL) is supported on HDFS
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</description>
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</property>
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<property>
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<name>dfs.https.need.client.auth</name>
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<value>false</value>
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<description>Whether SSL client certificate authentication is required
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</description>
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</property>
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<property>
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<name>dfs.https.server.keystore.resource</name>
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<value>ssl-server.xml</value>
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<description>Resource file from which ssl server keystore
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information will be extracted
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</description>
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</property>
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<property>
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<name>dfs.https.client.keystore.resource</name>
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<value>ssl-client.xml</value>
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<description>Resource file from which ssl client keystore
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information will be extracted
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</description>
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</property>
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<property>
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<name>dfs.datanode.https.address</name>
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<value>0.0.0.0:50475</value>
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</property>
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<property>
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<name>dfs.https.address</name>
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<value>0.0.0.0:50470</value>
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</property>
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<property>
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<name>dfs.datanode.dns.interface</name>
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<value>default</value>
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<description>The name of the Network Interface from which a data node should
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report its IP address.
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</description>
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</property>
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<property>
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<name>dfs.datanode.dns.nameserver</name>
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<value>default</value>
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<description>The host name or IP address of the name server (DNS)
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which a DataNode should use to determine the host name used by the
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NameNode for communication and display purposes.
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</description>
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</property>
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<property>
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<name>dfs.replication.considerLoad</name>
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<value>true</value>
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<description>Decide if chooseTarget considers the target's load or not
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</description>
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</property>
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<property>
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<name>dfs.default.chunk.view.size</name>
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<value>32768</value>
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<description>The number of bytes to view for a file on the browser.
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</description>
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</property>
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<property>
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<name>dfs.datanode.du.reserved</name>
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<value>0</value>
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<description>Reserved space in bytes per volume. Always leave this much space free for non dfs use.
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</description>
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</property>
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<property>
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<name>dfs.name.dir</name>
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<value>${hadoop.tmp.dir}/dfs/name</value>
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<description>Determines where on the local filesystem the DFS name node
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should store the name table(fsimage). If this is a comma-delimited list
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of directories then the name table is replicated in all of the
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directories, for redundancy. </description>
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</property>
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<property>
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<name>dfs.name.edits.dir</name>
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<value>${dfs.name.dir}</value>
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<description>Determines where on the local filesystem the DFS name node
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should store the transaction (edits) file. If this is a comma-delimited list
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of directories then the transaction file is replicated in all of the
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directories, for redundancy. Default value is same as dfs.name.dir
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</description>
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</property>
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<property>
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<name>dfs.namenode.edits.toleration.length</name>
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<value>0</value>
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<description>
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The length in bytes that namenode is willing to tolerate when the edit log
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is corrupted. The edit log toleration feature checks the entire edit log.
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It computes read length (the length of valid data), corruption length and
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padding length. In case that corruption length is non-zero, the corruption
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will be tolerated only if the corruption length is less than or equal to
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the toleration length.
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For disabling edit log toleration feature, set this property to -1. When
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the feature is disabled, the end of edit log will not be checked. In this
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case, namenode will startup normally even if the end of edit log is
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corrupted.
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</description>
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</property>
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<property>
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<name>dfs.web.ugi</name>
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<value>webuser,webgroup</value>
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<description>The user account used by the web interface.
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Syntax: USERNAME,GROUP1,GROUP2, ...
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</description>
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</property>
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<property>
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<name>dfs.permissions</name>
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<value>true</value>
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<description>
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If "true", enable permission checking in HDFS.
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If "false", permission checking is turned off,
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but all other behavior is unchanged.
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Switching from one parameter value to the other does not change the mode,
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owner or group of files or directories.
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</description>
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</property>
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<property>
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<name>dfs.permissions.supergroup</name>
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<value>supergroup</value>
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<description>The name of the group of super-users.</description>
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</property>
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<property>
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<name>dfs.block.access.token.enable</name>
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<value>false</value>
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<description>
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If "true", access tokens are used as capabilities for accessing datanodes.
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If "false", no access tokens are checked on accessing datanodes.
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</description>
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</property>
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<property>
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<name>dfs.block.access.key.update.interval</name>
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<value>600</value>
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<description>
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Interval in minutes at which namenode updates its access keys.
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</description>
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</property>
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<property>
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<name>dfs.block.access.token.lifetime</name>
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<value>600</value>
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<description>The lifetime of access tokens in minutes.</description>
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</property>
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<property>
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<name>dfs.data.dir</name>
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<value>${hadoop.tmp.dir}/dfs/data</value>
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<description>Determines where on the local filesystem an DFS data node
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should store its blocks. If this is a comma-delimited
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list of directories, then data will be stored in all named
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directories, typically on different devices.
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Directories that do not exist are ignored.
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</description>
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</property>
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<property>
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<name>dfs.datanode.data.dir.perm</name>
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<value>755</value>
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<description>Permissions for the directories on on the local filesystem where
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the DFS data node store its blocks. The permissions can either be octal or
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symbolic.</description>
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</property>
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<property>
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<name>dfs.replication</name>
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<value>3</value>
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<description>Default block replication.
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The actual number of replications can be specified when the file is created.
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The default is used if replication is not specified in create time.
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</description>
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</property>
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<property>
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<name>dfs.replication.max</name>
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<value>512</value>
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<description>Maximal block replication.
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</description>
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</property>
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<property>
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<name>dfs.replication.min</name>
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<value>1</value>
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<description>Minimal block replication.
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</description>
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</property>
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<property>
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<name>dfs.block.size</name>
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<value>67108864</value>
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<description>The default block size for new files.</description>
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</property>
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<property>
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<name>dfs.df.interval</name>
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<value>60000</value>
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<description>Disk usage statistics refresh interval in msec.</description>
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</property>
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<property>
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<name>dfs.client.block.write.retries</name>
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<value>3</value>
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<description>The number of retries for writing blocks to the data nodes,
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before we signal failure to the application.
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</description>
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</property>
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<property>
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<name>dfs.blockreport.intervalMsec</name>
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<value>3600000</value>
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<description>Determines block reporting interval in milliseconds.</description>
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</property>
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<property>
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<name>dfs.blockreport.initialDelay</name> <value>0</value>
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<description>Delay for first block report in seconds.</description>
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</property>
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<property>
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<name>dfs.heartbeat.interval</name>
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<value>3</value>
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<description>Determines datanode heartbeat interval in seconds.</description>
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</property>
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<property>
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<name>dfs.namenode.handler.count</name>
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<value>10</value>
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<description>The number of server threads for the namenode.</description>
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</property>
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<property>
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<name>dfs.safemode.threshold.pct</name>
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<value>0.999f</value>
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<description>
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Specifies the percentage of blocks that should satisfy
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the minimal replication requirement defined by dfs.replication.min.
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Values less than or equal to 0 mean not to wait for any particular
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percentage of blocks before exiting safemode.
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Values greater than 1 will make safe mode permanent.
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</description>
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</property>
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<property>
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<name>dfs.namenode.safemode.min.datanodes</name>
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<value>0</value>
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<description>
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Specifies the number of datanodes that must be considered alive
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before the name node exits safemode.
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Values less than or equal to 0 mean not to take the number of live
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datanodes into account when deciding whether to remain in safe mode
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during startup.
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Values greater than the number of datanodes in the cluster
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will make safe mode permanent.
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</description>
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</property>
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<property>
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<name>dfs.safemode.extension</name>
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<value>30000</value>
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<description>
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Determines extension of safe mode in milliseconds
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after the threshold level is reached.
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</description>
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</property>
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<property>
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<name>dfs.balance.bandwidthPerSec</name>
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<value>1048576</value>
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<description>
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Specifies the maximum amount of bandwidth that each datanode
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can utilize for the balancing purpose in term of
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the number of bytes per second.
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</description>
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</property>
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<property>
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<name>dfs.hosts</name>
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<value></value>
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<description>Names a file that contains a list of hosts that are
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permitted to connect to the namenode. The full pathname of the file
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must be specified. If the value is empty, all hosts are
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permitted.</description>
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</property>
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<property>
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<name>dfs.hosts.exclude</name>
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<value></value>
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<description>Names a file that contains a list of hosts that are
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not permitted to connect to the namenode. The full pathname of the
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file must be specified. If the value is empty, no hosts are
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excluded.</description>
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</property>
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<property>
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<name>dfs.max.objects</name>
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<value>0</value>
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<description>The maximum number of files, directories and blocks
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dfs supports. A value of zero indicates no limit to the number
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of objects that dfs supports.
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</description>
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</property>
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<property>
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<name>dfs.namenode.decommission.interval</name>
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<value>30</value>
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<description>Namenode periodicity in seconds to check if decommission is
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complete.</description>
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</property>
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<property>
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<name>dfs.namenode.decommission.nodes.per.interval</name>
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<value>5</value>
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<description>The number of nodes namenode checks if decommission is complete
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in each dfs.namenode.decommission.interval.</description>
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</property>
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<property>
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<name>dfs.replication.interval</name>
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<value>3</value>
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<description>The periodicity in seconds with which the namenode computes
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repliaction work for datanodes. </description>
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</property>
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<property>
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<name>dfs.access.time.precision</name>
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<value>3600000</value>
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<description>The access time for HDFS file is precise upto this value.
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The default value is 1 hour. Setting a value of 0 disables
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access times for HDFS.
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</description>
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</property>
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<property>
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<name>dfs.support.append</name>
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<description>
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This option is no longer supported. HBase no longer requires that
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this option be enabled as sync is now enabled by default. See
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HADOOP-8230 for additional information.
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</description>
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</property>
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<property>
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<name>dfs.namenode.delegation.key.update-interval</name>
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<value>86400000</value>
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<description>The update interval for master key for delegation tokens
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in the namenode in milliseconds.
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</description>
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</property>
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<property>
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<name>dfs.namenode.delegation.token.max-lifetime</name>
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<value>604800000</value>
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<description>The maximum lifetime in milliseconds for which a delegation
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token is valid.
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</description>
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</property>
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<property>
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<name>dfs.namenode.delegation.token.renew-interval</name>
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<value>86400000</value>
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<description>The renewal interval for delegation token in milliseconds.
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</description>
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</property>
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<property>
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<name>dfs.datanode.failed.volumes.tolerated</name>
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<value>0</value>
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<description>The number of volumes that are allowed to
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fail before a datanode stops offering service. By default
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any volume failure will cause a datanode to shutdown.
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</description>
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</property>
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<property>
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<name>dfs.datanode.max.xcievers</name>
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<value>4096</value>
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<description>Specifies the maximum number of threads to use for transferring data
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in and out of the DN.
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</description>
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</property>
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<property>
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<name>dfs.datanode.readahead.bytes</name>
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<value>4193404</value>
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<description>
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While reading block files, if the Hadoop native libraries are available,
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the datanode can use the posix_fadvise system call to explicitly
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page data into the operating system buffer cache ahead of the current
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reader's position. This can improve performance especially when
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disks are highly contended.
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This configuration specifies the number of bytes ahead of the current
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read position which the datanode will attempt to read ahead. This
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feature may be disabled by configuring this property to 0.
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If the native libraries are not available, this configuration has no
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effect.
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</description>
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</property>
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<property>
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<name>dfs.datanode.drop.cache.behind.reads</name>
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<value>false</value>
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<description>
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In some workloads, the data read from HDFS is known to be significantly
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large enough that it is unlikely to be useful to cache it in the
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operating system buffer cache. In this case, the DataNode may be
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configured to automatically purge all data from the buffer cache
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after it is delivered to the client. This behavior is automatically
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disabled for workloads which read only short sections of a block
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(e.g HBase random-IO workloads).
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This may improve performance for some workloads by freeing buffer
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cache spage usage for more cacheable data.
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If the Hadoop native libraries are not available, this configuration
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has no effect.
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</description>
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</property>
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<property>
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<name>dfs.datanode.drop.cache.behind.writes</name>
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<value>false</value>
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<description>
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In some workloads, the data written to HDFS is known to be significantly
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large enough that it is unlikely to be useful to cache it in the
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operating system buffer cache. In this case, the DataNode may be
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configured to automatically purge all data from the buffer cache
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after it is written to disk.
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This may improve performance for some workloads by freeing buffer
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cache spage usage for more cacheable data.
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If the Hadoop native libraries are not available, this configuration
|
|
has no effect.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.datanode.sync.behind.writes</name>
|
|
<value>false</value>
|
|
<description>
|
|
If this configuration is enabled, the datanode will instruct the
|
|
operating system to enqueue all written data to the disk immediately
|
|
after it is written. This differs from the usual OS policy which
|
|
may wait for up to 30 seconds before triggering writeback.
|
|
|
|
This may improve performance for some workloads by smoothing the
|
|
IO profile for data written to disk.
|
|
|
|
If the Hadoop native libraries are not available, this configuration
|
|
has no effect.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.client.use.datanode.hostname</name>
|
|
<value>false</value>
|
|
<description>Whether clients should use datanode hostnames when
|
|
connecting to datanodes.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.datanode.use.datanode.hostname</name>
|
|
<value>false</value>
|
|
<description>Whether datanodes should use datanode hostnames when
|
|
connecting to other datanodes for data transfer.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.client.local.interfaces</name>
|
|
<value></value>
|
|
<description>A comma separated list of network interface names to use
|
|
for data transfer between the client and datanodes. When creating
|
|
a connection to read from or write to a datanode, the client
|
|
chooses one of the specified interfaces at random and binds its
|
|
socket to the IP of that interface. Individual names may be
|
|
specified as either an interface name (eg "eth0"), a subinterface
|
|
name (eg "eth0:0"), or an IP address (which may be specified using
|
|
CIDR notation to match a range of IPs).
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.image.transfer.bandwidthPerSec</name>
|
|
<value>0</value>
|
|
<description>
|
|
Specifies the maximum amount of bandwidth that can be utilized
|
|
for image transfer in term of the number of bytes per second.
|
|
A default value of 0 indicates that throttling is disabled.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.webhdfs.enabled</name>
|
|
<value>false</value>
|
|
<description>
|
|
Enable WebHDFS (REST API) in Namenodes and Datanodes.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.namenode.kerberos.internal.spnego.principal</name>
|
|
<value>${dfs.web.authentication.kerberos.principal}</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.secondary.namenode.kerberos.internal.spnego.principal</name>
|
|
<value>${dfs.web.authentication.kerberos.principal}</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.namenode.invalidate.work.pct.per.iteration</name>
|
|
<value>0.32f</value>
|
|
<description>
|
|
*Note*: Advanced property. Change with caution.
|
|
This determines the percentage amount of block
|
|
invalidations (deletes) to do over a single DN heartbeat
|
|
deletion command. The final deletion count is determined by applying this
|
|
percentage to the number of live nodes in the system.
|
|
The resultant number is the number of blocks from the deletion list
|
|
chosen for proper invalidation over a single heartbeat of a single DN.
|
|
Value should be a positive, non-zero percentage in float notation (X.Yf),
|
|
with 1.0f meaning 100%.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.namenode.replication.work.multiplier.per.iteration</name>
|
|
<value>2</value>
|
|
<description>
|
|
*Note*: Advanced property. Change with caution.
|
|
This determines the total amount of block transfers to begin in
|
|
parallel at a DN, for replication, when such a command list is being
|
|
sent over a DN heartbeat by the NN. The actual number is obtained by
|
|
multiplying this multiplier with the total number of live nodes in the
|
|
cluster. The result number is the number of blocks to begin transfers
|
|
immediately for, per DN heartbeat. This number can be any positive,
|
|
non-zero integer.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.namenode.avoid.read.stale.datanode</name>
|
|
<value>false</value>
|
|
<description>
|
|
Indicate whether or not to avoid reading from "stale" datanodes whose
|
|
heartbeat messages have not been received by the namenode
|
|
for more than a specified time interval. Stale datanodes will be
|
|
moved to the end of the node list returned for reading. See
|
|
dfs.namenode.avoid.write.stale.datanode for a similar setting for writes.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.namenode.avoid.write.stale.datanode</name>
|
|
<value>false</value>
|
|
<description>
|
|
Indicate whether or not to avoid writing to "stale" datanodes whose
|
|
heartbeat messages have not been received by the namenode
|
|
for more than a specified time interval. Writes will avoid using
|
|
stale datanodes unless more than a configured ratio
|
|
(dfs.namenode.write.stale.datanode.ratio) of datanodes are marked as
|
|
stale. See dfs.namenode.avoid.read.stale.datanode for a similar setting
|
|
for reads.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.namenode.stale.datanode.interval</name>
|
|
<value>30000</value>
|
|
<description>
|
|
Default time interval for marking a datanode as "stale", i.e., if
|
|
the namenode has not received heartbeat msg from a datanode for
|
|
more than this time interval, the datanode will be marked and treated
|
|
as "stale" by default. The stale interval cannot be too small since
|
|
otherwise this may cause too frequent change of stale states.
|
|
We thus set a minimum stale interval value (the default value is 3 times
|
|
of heartbeat interval) and guarantee that the stale interval cannot be less
|
|
than the minimum value.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.namenode.write.stale.datanode.ratio</name>
|
|
<value>0.5f</value>
|
|
<description>
|
|
When the ratio of number stale datanodes to total datanodes marked
|
|
is greater than this ratio, stop avoiding writing to stale nodes so
|
|
as to prevent causing hotspots.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.datanode.plugins</name>
|
|
<value></value>
|
|
<description>Comma-separated list of datanode plug-ins to be activated.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.namenode.plugins</name>
|
|
<value></value>
|
|
<description>Comma-separated list of namenode plug-ins to be activated.
|
|
</description>
|
|
</property>
|
|
|
|
</configuration>
|