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From "Alexey Goncharuk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-11704) Write tombstones during rebalance to get rid of deferred delete buffer
Date Tue, 09 Apr 2019 11:54:00 GMT
Alexey Goncharuk created IGNITE-11704:
-----------------------------------------

             Summary: 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


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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