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From "Pavel Kovalenko (Jira)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-11704) Write tombstones during rebalance to get rid of deferred delete buffer
Date Mon, 02 Sep 2019 13:55:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-11704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16920882#comment-16920882
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Pavel Kovalenko commented on IGNITE-11704:
------------------------------------------

[~sboikov] If you don't mind I'll take the ticket for finishing.

> 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: Pavel Kovalenko
>            Priority: Major
>              Labels: rebalance
>
> 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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