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Posted to issues@ignite.apache.org by "Ignite TC Bot (Jira)" <ji...@apache.org> on 2021/07/13 10:58:00 UTC
[jira] [Commented] (IGNITE-11704) Write tombstones during rebalance
to get rid of deferred delete buffer
[ https://issues.apache.org/jira/browse/IGNITE-11704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17379825#comment-17379825 ]
Ignite TC Bot commented on IGNITE-11704:
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* IgniteBasicTestSuite: WALRecordSerializationTest.testAllWalRecordsSerializedAndDeserializedSuccessfully - Test has low fail rate in base branch 0,0% and is not flaky
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[TeamCity *--> Run :: All* Results|https://ci.ignite.apache.org/viewLog.html?buildId=6084197&buildTypeId=IgniteTests24Java8_RunAll]
> Write tombstones during rebalance to get rid of deferred delete buffer
> ----------------------------------------------------------------------
>
> Key: IGNITE-11704
> URL: https://issues.apache.org/jira/browse/IGNITE-11704
> Project: Ignite
> Issue Type: Improvement
> Reporter: Alexey Goncharuk
> Assignee: Alexey Scherbakov
> Priority: Major
> Labels: rebalance
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Currently Ignite relies on deferred delete buffer in order to handle write-remove conflicts during rebalance. Given the limit size of the buffer, this approach is fundamentally flawed, especially in case when persistence is enabled.
> I suggest to extend the logic of data storage to be able to store key tombstones - to keep version for deleted entries. The tombstones will be stored when rebalance is in progress and should be cleaned up when rebalance is completed.
> Later this approach may be used to implement fast partition rebalance based on merkle trees (in this case, tombstones should be written on an incomplete baseline).
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