Bug 1584483 - afr: don't update readables if inode refresh failed on all children
Summary: afr: don't update readables if inode refresh failed on all children
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: GlusterFS
Classification: Community
Component: replicate
Version: mainline
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Ravishankar N
QA Contact:
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Whiteboard:
Depends On:
Blocks: 1597116 1599247
TreeView+ depends on / blocked
 
Reported: 2018-05-31 03:13 UTC by Ravishankar N
Modified: 2018-10-23 15:10 UTC (History)
1 user (show)

Fixed In Version: glusterfs-5.0
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Clone Of:
: 1597116 1599247 (view as bug list)
Environment:
Last Closed: 2018-10-23 15:10:44 UTC
Regression: ---
Mount Type: ---
Documentation: ---
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Description Ravishankar N 2018-05-31 03:13:17 UTC
Description of problem:

To see if BZ 1329505 can be solved since the stop gap fix for it is being reverted at https://review.gluster.org/#/c/20028 . */ 

Problem: If inode refresh failed on all children of afr due to ENOENT (say file migrated by dht), it resets the readables to zero. Any inflight txn which then later comes on the inode fails with EIO because no readable children present for the inode.

Fix: Don't update readables when inode refresh fails on *all* children of afr. In that way any inflight txns will either proceed with its own inode refresh if needed and fail it with the right errno or use the old value of readables and continue with the txn.

Comment 1 Worker Ant 2018-05-31 03:17:37 UTC
REVIEW: https://review.gluster.org/20029 (afr: don't update readables if inode refresh failed on all children) posted (#2) for review on master by Ravishankar N

Comment 2 Worker Ant 2018-06-18 15:30:06 UTC
COMMIT: https://review.gluster.org/20029 committed in master by "Ravishankar N" <ravishankar> with a commit message- afr: don't update readables if inode refresh failed on all children

Problem:
If inode refresh failed on all children of afr due to ENOENT (say file
migrated by dht), it resets the readables to zero. Any inflight txn which
then later comes on the inode fails with EIO because no readable
children present for the inode.

Fix:
Don't update readables when inode refresh fails on *all* children of
afr. In that way any inflight txns will either proceed with its own inode
refresh if needed and fail it with the right errno or use the old value
of readables and continue with the txn.

Also, add quorum checks to the beginning of afr_transaction(). Otherwise, we
seem to be winding the lock and checking for quorum only in pre-op pahse.

Note: This should ideally fix BZ 1329505 since the stop gap fix for
it is has been reverted at https://review.gluster.org/#/c/20028.

Change-Id: Ia638c092d8d12dc27afb3cdad133394845061319
updates: bz#1584483
Signed-off-by: Ravishankar N <ravishankar>

Comment 3 Shyamsundar 2018-10-23 15:10:44 UTC
This bug is getting closed because a release has been made available that should address the reported issue. In case the problem is still not fixed with glusterfs-5.0, please open a new bug report.

glusterfs-5.0 has been announced on the Gluster mailinglists [1], packages for several distributions should become available in the near future. Keep an eye on the Gluster Users mailinglist [2] and the update infrastructure for your distribution.

[1] https://lists.gluster.org/pipermail/announce/2018-October/000115.html
[2] https://www.gluster.org/pipermail/gluster-users/


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