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DAOS-15431 vos: clear DTX in CoS cache for the one committed by other - b24 #14324

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@Nasf-Fan Nasf-Fan commented May 7, 2024

It is possible that the DTX is committed locally via commit-on-share mechanism during some subsequent modification. But such modification may get failure on some remote paraticipant. Then the DTX entry will not be removed from CoS cache under such case because we do not know whether such DTX has already been committed on remote participant(s) successfully or not. Keeping it in CoS cache will allow us to re-try the commit globally sometime later.

Next time, when we re-try to commit such DTX globally, if all remote participants claim as done (return 0 or DER_NONEXIST or DER_ALREADY) successfully, then even if local VOS calims as DER_ALREADY, we still need to remove the DTX entry from CoS cache. Otherwise, we will find such DTX entry in the CoS cache everytime for batched commit (or DTX resync) as to block related process.

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… - b24

It is possible that the DTX is committed locally via commit-on-share
mechanism during some subsequent modification. But such modification
may get failure on some remote paraticipant. Then the DTX entry will
not be removed from CoS cache under such case because we do not know
whether such DTX has already been committed on remote participant(s)
successfully or not. Keeping it in CoS cache will allow us to re-try
the commit globally sometime later.

Next time, when we re-try to commit such DTX globally, if all remote
participants claim as done (return 0 or DER_NONEXIST or DER_ALREADY)
successfully, then even if local VOS calims as DER_ALREADY, we still
need to remove the DTX entry from CoS cache. Otherwise, we will find
such DTX entry in the CoS cache everytime for batched commit (or DTX
resync) as to block related process.

Signed-off-by: Fan Yong <fan.yong@intel.com>
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github-actions bot commented May 7, 2024

Bug-tracker data:
Ticket title is 'daos_test/suite.py: test_daos_rebuild_simple: during iteration: Test interrupted by SIGTERM'
Status is 'In Review'
Labels: 'scrubbed,triaged'
https://daosio.atlassian.net/browse/DAOS-15431

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LGTM. No errors found by checkpatch.

@Nasf-Fan Nasf-Fan marked this pull request as ready for review May 9, 2024 06:30
@Nasf-Fan Nasf-Fan requested review from a team as code owners May 9, 2024 06:30
@Nasf-Fan Nasf-Fan added the release-2.4 PR is eventually targeted for 2.4 label May 14, 2024
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No plan for back-port to release/2.4.

@Nasf-Fan Nasf-Fan closed this May 15, 2024
@Nasf-Fan Nasf-Fan deleted the Nasf-Fan/DAOS-15431_b24 branch October 9, 2024 09:45
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