openstack
/
cinder
Code Issues Proposed changes

Remove logging on Swift backup obj writer 

Since change I1f1d9c0d6e3f04f1ecd5ef7c5d813005ee116409 we are running
parts of the backups on native threads, which due to an eventlet bug [1]
have bad interactions with greenthreads, so we have to avoid any logging
when executing code in a native thread.

This patch removes the MD5 logging on the SwiftObjectWriter close
method and adds comments and docstring referring to this limitation.

[1] https://github.com/eventlet/eventlet/issues/432

Closes-Bug: #1745168
Change-Id: I0857cecd7d8ab0ee7e3e9bd6e15f4987ede4d653
(cherry picked from commit c6cb84bd63)
This commit is contained in:
Gorka Eguileor 2018-01-24 17:00:19 +01:00
parent 96d0e2755d
commit a1084c237a
2 changed files with 17 additions and 7 deletions
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20
cinder/backup/chunkeddriver.py
View File

@ -56,6 +56,11 @@ CONF = cfg.CONF
CONF.register_opts(chunkedbackup_service_opts)
# Object writer and reader returned by inheriting classes must not have any
# logging calls, as well as the compression libraries, as eventlet has a bug
# (https://github.com/eventlet/eventlet/issues/432) that would result in
# failures.
@six.add_metaclass(abc.ABCMeta)
class ChunkedBackupDriver(driver.BackupDriver):
"""Abstract chunked backup driver.
@ -122,14 +127,23 @@ class ChunkedBackupDriver(driver.BackupDriver):
def get_object_writer(self, container, object_name, extra_metadata=None):
"""Returns a writer object which stores the chunk data in backup repository.
The object returned should be a context handler that can be used
in a "with" context.
The object returned should be a context handler that can be used in a
"with" context.
The object writer methods must not have any logging calls, as eventlet
has a bug (https://github.com/eventlet/eventlet/issues/432) that would
result in failures.
"""
return
@abc.abstractmethod
def get_object_reader(self, container, object_name, extra_metadata=None):
"""Returns a reader object for the backed up chunk."""
"""Returns a reader object for the backed up chunk.
The object reader methods must not have any logging calls, as eventlet
has a bug (https://github.com/eventlet/eventlet/issues/432) that would
result in failures.
"""
return
@abc.abstractmethod

4
cinder/backup/drivers/swift.py
View File

@ -280,11 +280,7 @@ class SwiftBackupDriver(chunkeddriver.ChunkedBackupDriver):
content_length=len(self.data))
except socket.error as err:
raise exception.SwiftConnectionFailed(reason=err)
LOG.debug('swift MD5 for %(object_name)s: %(etag)s',
{'object_name': self.object_name, 'etag': etag, })
md5 = hashlib.md5(self.data).hexdigest()
LOG.debug('backup MD5 for %(object_name)s: %(md5)s',
{'object_name': self.object_name, 'md5': md5})
if etag != md5:
err = _('error writing object to swift, MD5 of object in '
'swift %(etag)s is not the same as MD5 of object sent '