glusterfs.git/tests/bugs/replicate, branch release-6 cluster/afr: Prioritize ENOSPC over other errors 2020-07-08T01:29:06+00:00 karthik-us ksubrahm@redhat.com 2020-05-21T09:48:59+00:00 c30bd3ca40fe2235ab46f3cd1e76ed64ba0cd8e4 Problem: In a replicate/arbiter volume if file creations or writes fails on quorum number of bricks and on one brick it is due to ENOSPC and on other brick it fails for a different reason, it may fail with errors other than ENOSPC in some cases. Fix: Prioritize ENOSPC over other lesser priority errors and do not set op_errno in posix_gfid_set if op_ret is 0 to avoid receiving any error_no which can be misinterpreted by __afr_dir_write_finalize(). Also removing the function afr_has_arbiter_fop_cbk_quorum() which might consider a successful reply form a single brick as quorum success in some cases, whereas we always need fop to be successful on quorum number of bricks in arbiter configuration. Change-Id: I106e267f8b9451f681022f1cccb410d9bc824c08 Fixes: #1254 Signed-off-by: karthik-us <ksubrahm@redhat.com> (cherry picked from commit fa63b45ca5edf172b1b89b28b5db3c5129cc57b6) 
Problem:
In a replicate/arbiter volume if file creations or writes fails on
quorum number of bricks and on one brick it is due to ENOSPC and
on other brick it fails for a different reason, it may fail with
errors other than ENOSPC in some cases.

Fix:
Prioritize ENOSPC over other lesser priority errors and do not set
op_errno in posix_gfid_set if op_ret is 0 to avoid receiving any
error_no which can be misinterpreted by __afr_dir_write_finalize().

Also removing the function afr_has_arbiter_fop_cbk_quorum() which
might consider a successful reply form a single brick as quorum
success in some cases, whereas we always need fop to be successful
on quorum number of bricks in arbiter configuration.

Change-Id: I106e267f8b9451f681022f1cccb410d9bc824c08
Fixes: #1254
Signed-off-by: karthik-us <ksubrahm@redhat.com>
(cherry picked from commit fa63b45ca5edf172b1b89b28b5db3c5129cc57b6)
afr: more quorum checks in lookup and new entry marking 2020-07-08T01:26:32+00:00 Ravishankar N ravishankar@redhat.com 2020-06-16T05:17:47+00:00 4cc44e3f128bf0eb90e5634c634ff5eabeaeda60 Problem: See github issue for details. Fix: -In lookup if the entry exists in 2 out of 3 bricks, don't fail the lookup with ENOENT just because there is an entrylk on the parent. Consider quorum before deciding. -If entry FOP does not succeed on quorum no. of bricks, do not perform new entry mark. Fixes: #1303 Change-Id: I56df8c89ad53b29fa450c7930a7b7ccec9f4a6c5 Signed-off-by: Ravishankar N <ravishankar@redhat.com> (cherry picked from commit c4a6748f25d2c1ab3ebcf89952278ebf94c8d371) 
Problem: See github issue for details.

Fix:
-In lookup if the entry exists in 2 out of 3 bricks, don't fail the
lookup with ENOENT just because there is an entrylk on the parent.
Consider quorum before deciding.

-If entry FOP does not succeed on quorum no. of bricks, do not perform
new entry mark.

Fixes: #1303
Change-Id: I56df8c89ad53b29fa450c7930a7b7ccec9f4a6c5
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
(cherry picked from commit c4a6748f25d2c1ab3ebcf89952278ebf94c8d371)
afr: mark pending xattrs as a part of metadata heal 2020-04-20T07:40:10+00:00 Ravishankar N ravishankar@redhat.com 2018-12-24T07:30:19+00:00 7ea9eec1e89b9e9576120e89aef15b15f3d14768 ...if pending xattrs are zero for all children. Problem: If there are no pending xattrs and a metadata heal needs to be performed, it can be possible that we end up with xattrs inadvertendly deleted from all bricks, as explained in the BZ. Fix: After picking one among the sources as the good copy, mark pending xattrs on all sources to blame the sinks. Now even if this metadata heal fails midway, a subsequent heal will still choose one of the valid sources that it picked previously. Updates: #1067 Change-Id: If1b050b70b0ad911e162c04db4d89b263e2b8d7b Signed-off-by: Ravishankar N <ravishankar@redhat.com> (cherry picked from commit 2d5ba449e9200b16184b1e7fc84cabd015f1f779) 
...if pending xattrs are zero for all children.

Problem:
If there are no pending xattrs and a metadata heal needs to be
performed, it can be possible that we end up with xattrs inadvertendly
deleted from all bricks, as explained in the  BZ.

Fix:
After picking one among the sources as the good copy, mark pending xattrs on
all sources to blame the sinks. Now even if this metadata heal fails midway,
a subsequent heal will still choose one of the valid sources that it
picked previously.

Updates: #1067
Change-Id: If1b050b70b0ad911e162c04db4d89b263e2b8d7b
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
(cherry picked from commit 2d5ba449e9200b16184b1e7fc84cabd015f1f779)
afr: prevent spurious entry heals leading to gfid split-brain 2020-02-28T06:06:10+00:00 Ravishankar N ravishankar@redhat.com 2020-02-11T09:04:48+00:00 559fd060c59edec69ba66be7e0a447c8e0408d51 Problem: In a hyperconverged setup with granular-entry-heal enabled, if a file is recreated while one of the bricks is down, and an index heal is triggered (with the brick still down), entry-self heal was doing a spurious heal with just the 2 good bricks. It was doing a post-op leading to removal of the filename from .glusterfs/indices/entry-changes as well as erroneous setting of afr xattrs on the parent. When the brick came up, the xattrs were cleared, resulting in the renamed file not getting healed and leading to gfid split-brain and EIO on the mount. Fix: Proceed with entry heal only when shd can connect to all bricks of the replica, just like in data and metadata heal. fixes: bz#1804594 Change-Id: I916ae26ad1fabf259bc6362da52d433b7223b17e Signed-off-by: Ravishankar N <ravishankar@redhat.com> (cherry picked from commit 06453d77d056fbaa393a137ca277a20e38d2f67e) 
Problem:
In a hyperconverged setup with granular-entry-heal enabled, if a file is
recreated while one of the bricks is down, and an index heal is triggered
(with the brick still down), entry-self heal was doing a spurious heal
with just the 2 good bricks. It was doing a post-op leading to removal
of the filename from .glusterfs/indices/entry-changes as well as
erroneous setting of afr xattrs on the parent. When the brick came up,
the xattrs were cleared, resulting in the renamed file not getting
healed and leading to gfid split-brain and EIO on the mount.

Fix:
Proceed with entry heal only when shd can connect to all bricks of the replica,
just like in data and metadata heal.

fixes: bz#1804594
Change-Id: I916ae26ad1fabf259bc6362da52d433b7223b17e
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
(cherry picked from commit 06453d77d056fbaa393a137ca277a20e38d2f67e)
Cluster/afr: Don't treat all bricks having metadata pending as split-brain 2020-02-25T07:06:51+00:00 karthik-us ksubrahm@redhat.com 2019-06-06T05:29:42+00:00 96d326cc917baf6ac44f4deacef6d251ebcdf0ea Problem: We currently don't have a roll-back/undoing of post-ops if quorum is not met. Though the FOP is still unwound with failure, the xattrs remain on the disk. Due to these partial post-ops and partial heals (healing only when 2 bricks are up), we can end up in metadata split-brain purely from the afr xattrs point of view i.e each brick is blamed by atleast one of the others for metadata. These scenarios are hit when there is frequent connect/disconnect of the client/shd to the bricks. Fix: Pick a source based on the xattr values. If 2 bricks blame one, the blamed one must be treated as sink. If there is no majority, all are sources. Once we pick a source, self-heal will then do the heal instead of erroring out due to split-brain. This patch also adds restriction of all the bricks to be up to perform metadata heal to avoid any metadata loss. Removed the test case tests/bugs/replicate/bug-1468279-source-not-blaming-sinks.t as it was doing metadata heal even when only 2 of 3 bricks were up. Change-Id: I07a9d62f84ceda329dcab1f02a33aeed258dcb09 fixes: bz#1805097 Signed-off-by: karthik-us <ksubrahm@redhat.com> 
Problem:
We currently don't have a roll-back/undoing of post-ops if quorum is not met.
Though the FOP is still unwound with failure, the xattrs remain on the disk.
Due to these partial post-ops and partial heals (healing only when 2 bricks
are up), we can end up in metadata split-brain purely from the afr xattrs
point of view i.e each brick is blamed by atleast one of the others for
metadata. These scenarios are hit when there is frequent connect/disconnect
of the client/shd to the bricks.

Fix:
Pick a source based on the xattr values. If 2 bricks blame one, the blamed
one must be treated as sink. If there is no majority, all are sources. Once
we pick a source, self-heal will then do the heal instead of erroring out
due to split-brain.
This patch also adds restriction of all the bricks to be up to perform
metadata heal to avoid any metadata loss.

Removed the test case tests/bugs/replicate/bug-1468279-source-not-blaming-sinks.t
as it was doing metadata heal even when only 2 of 3 bricks were up.

Change-Id: I07a9d62f84ceda329dcab1f02a33aeed258dcb09
fixes: bz#1805097
Signed-off-by: karthik-us <ksubrahm@redhat.com>
cluster/afr: Heal entries when there is a source & no healed_sinks 2019-10-17T10:52:54+00:00 karthik-us ksubrahm@redhat.com 2019-09-05T10:44:50+00:00 b69eb47dd3ee968325fa070ee500c8b70fcc96bc Problem: In a situation where B1 blames B2, B2 blames B1 and B3 doesn't blame anything for entry heal, heal will not complete even though we have clear source and sinks. This will happen because while doing afr_selfheal_find_direction() only the bricks which are blamed by non-accused bricks are considered as sinks. Later in __afr_selfheal_entry_finalize_source() when it tries to mark all the non-sources as sinks it fails to do so because there won't be any healed_sinks marked, no witness present and there will be a source. Fix: If there is a source and no healed_sinks, then reset all the locked sources to 0 and healed sinks to 1 to do conservative merge. Change-Id: If40d8bc95d52a52b2730f55bdcf135109b421548 Fixes: bz#1760706 Signed-off-by: karthik-us <ksubrahm@redhat.com> 
Problem:
In a situation where B1 blames B2, B2 blames B1 and B3 doesn't blame
anything for entry heal, heal will not complete even though we have
clear source and sinks. This will happen because while doing
afr_selfheal_find_direction() only the bricks which are blamed by
non-accused bricks are considered as sinks. Later in
__afr_selfheal_entry_finalize_source() when it tries to mark all the
non-sources as sinks it fails to do so because there won't be any
healed_sinks marked, no witness present and there will be a source.

Fix:
If there is a source and no healed_sinks, then reset all the locked
sources to 0 and healed sinks to 1 to do conservative merge.

Change-Id: If40d8bc95d52a52b2730f55bdcf135109b421548
Fixes: bz#1760706
Signed-off-by: karthik-us <ksubrahm@redhat.com>
afr: support split-brain CLI for replica 3 2019-10-17T10:51:33+00:00 Ravishankar N ravishankar@redhat.com 2019-09-28T03:23:08+00:00 50dbcd45fa3165247608e2b889d6a802ba5d6323 Ever since we added quorum checks for lookups in afr via commit bd44d59741bb8c0f5d7a62c5b1094179dd0ce8a4, the split-brain resolution commands would not work for replica 3 because there would be no readables for the lookup fop. The argument was that split-brains do not occur in replica 3 but we do see (data/metadata) split-brain cases once in a while which indicate that there are a few bugs/corner cases yet to be discovered and fixed. Fortunately, commit 8016d51a3bbd410b0b927ed66be50a09574b7982 added GF_CLIENT_PID_GLFS_HEALD as the pid for all fops made by glfsheal. If we leverage this and allow lookups in afr when pid is GF_CLIENT_PID_GLFS_HEALD, split-brain resolution commands will work for replica 3 volumes too. Likewise, the check is added in shard_lookup as well to permit resolving split-brains by specifying "/.shard/shard-file.xx" as the file name (which previously used to fail with EPERM). Change-Id: I3c543dea79caf7cfbc1633e9089cb1cdd2538ba9 Fixes: bz#1760792 Signed-off-by: Ravishankar N <ravishankar@redhat.com> (cherry picked from commit 47dbd753187f69b3835d2e42fdbe7485874c4b3e) 
Ever since we added quorum checks for lookups in afr via commit
bd44d59741bb8c0f5d7a62c5b1094179dd0ce8a4, the split-brain resolution
commands would not work for replica 3 because there would be no
readables for the lookup fop.

The argument was that split-brains do not occur in replica 3 but we do
see (data/metadata) split-brain cases once in a while which indicate that there are
a few bugs/corner cases yet to be discovered and fixed.

Fortunately, commit  8016d51a3bbd410b0b927ed66be50a09574b7982 added
GF_CLIENT_PID_GLFS_HEALD as the pid for all fops made by glfsheal. If we
leverage this and allow lookups in afr when pid is GF_CLIENT_PID_GLFS_HEALD,
split-brain resolution commands will work for replica 3 volumes too.

Likewise, the check is added in shard_lookup as well to permit resolving
split-brains by specifying "/.shard/shard-file.xx" as the file name
(which previously used to fail with EPERM).

Change-Id: I3c543dea79caf7cfbc1633e9089cb1cdd2538ba9
Fixes: bz#1760792
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
(cherry picked from commit 47dbd753187f69b3835d2e42fdbe7485874c4b3e)
ctime/rebalance: Heal ctime xattr on directory during rebalance 2019-09-27T11:34:25+00:00 Kotresh HR khiremat@redhat.com 2019-07-29T13:00:42+00:00 e152f753013f923f95ebdd63ffc4de0cd44221d1 After add-brick and rebalance, the ctime xattr is not present on rebalanced directories on new brick. This patch fixes the same. Note that ctime still doesn't support consistent time across distribute sub-volume. This patch also fixes the in-memory inconsistency of time attributes when metadata is self healed. Backport of: > Patch: https://review.gluster.org/23127 > Change-Id: Ia20506f1839021bf61d4753191e7dc34b31bb2df > BUG: 1734026 > Signed-off-by: Kotresh HR <khiremat@redhat.com> Patch: https://review.gluster.org/23127 Change-Id: Ia20506f1839021bf61d4753191e7dc34b31bb2df fixes: bz#1752413 Signed-off-by: Kotresh HR <khiremat@redhat.com> 
After add-brick and rebalance, the ctime xattr is not present
on rebalanced directories on new brick. This patch fixes the
same.

Note that ctime still doesn't support consistent time across
distribute sub-volume.

This patch also fixes the in-memory inconsistency of time attributes
when metadata is self healed.

Backport of:
 > Patch: https://review.gluster.org/23127
 > Change-Id: Ia20506f1839021bf61d4753191e7dc34b31bb2df
 > BUG: 1734026
 > Signed-off-by: Kotresh HR <khiremat@redhat.com>

Patch: https://review.gluster.org/23127
Change-Id: Ia20506f1839021bf61d4753191e7dc34b31bb2df
fixes: bz#1752413
Signed-off-by: Kotresh HR <khiremat@redhat.com>
afr/lookup: Pass xattr_req in while doing a selfheal in lookup 2019-09-23T07:00:22+00:00 Mohammed Rafi KC rkavunga@redhat.com 2019-07-10T16:14:38+00:00 850f20c5aeb0c935be99bef13e8a49bd52f186ff We were not passing xattr_req when doing a name self heal as well as a meta data heal. Because of this, some xdata was missing which causes i/o errors Backport of > https://review.gluster.org/#/c/glusterfs/+/23024/ >Change-Id: Ibfb1205a7eb0195632dc3820116ffbbb8043545f >Fixes: bz#1728770 >Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com> Fixes: bz#1749307 Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com> (cherry picked from commit d026f0bcfd301712e4f0671ccf238f43f2e6dd30) Change-Id: Ibfb1205a7eb0195632dc3820116ffbbb8043545f 
We were not passing xattr_req when doing a name self heal
as well as a meta data heal. Because of this, some xdata
was missing which causes i/o errors

Backport of > https://review.gluster.org/#/c/glusterfs/+/23024/
>Change-Id: Ibfb1205a7eb0195632dc3820116ffbbb8043545f
>Fixes: bz#1728770
>Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com>

Fixes: bz#1749307
Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com>
(cherry picked from commit d026f0bcfd301712e4f0671ccf238f43f2e6dd30)

Change-Id: Ibfb1205a7eb0195632dc3820116ffbbb8043545f
afr: wake up index healer threads 2019-09-05T05:59:32+00:00 Ravishankar N ravishankar@redhat.com 2019-08-30T05:00:31+00:00 3f0658b54c92131ec468a66b9fe0c3ac86e42061 (Backport of https://review.gluster.org/#/c/glusterfs/+/23288/) ...whenever shd is re-enabled after disabling or there is a change in `cluster.heal-timeout`, without needing to restart shd or waiting for the current `cluster.heal-timeout` seconds to expire. See BZ 1743988 for more details. Change-Id: Ia5ebd7c8e9f5b54cba3199c141fdd1af2f9b9bfe fixes: bz#1743988 Reported-by: Glen Kiessling <glenk1973@hotmail.com> Signed-off-by: Ravishankar N <ravishankar@redhat.com> 
(Backport of https://review.gluster.org/#/c/glusterfs/+/23288/)

...whenever shd is re-enabled after disabling or there is a change in
`cluster.heal-timeout`, without needing to restart shd or waiting for the
current `cluster.heal-timeout` seconds to expire.

See BZ 1743988 for more details.

Change-Id: Ia5ebd7c8e9f5b54cba3199c141fdd1af2f9b9bfe
fixes: bz#1743988
Reported-by: Glen Kiessling <glenk1973@hotmail.com>
Signed-off-by: Ravishankar N <ravishankar@redhat.com>