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From "Vladislav Pyatkov (Jira)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-14821) AssertionError: Historical iterator tries to iterate WAL out of reservation
Date Thu, 03 Jun 2021 07:17:00 GMT
Vladislav Pyatkov created IGNITE-14821:
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             Summary: AssertionError: Historical iterator tries to iterate WAL out of reservation
                 Key: IGNITE-14821
                 URL: https://issues.apache.org/jira/browse/IGNITE-14821
             Project: Ignite
          Issue Type: Improvement
            Reporter: Vladislav Pyatkov


A reason of the issue is incorrect comparison WAL pointer, that leads to choose not quite
the last pointer for reservation before rebalance. The old code selected the earliest WAL
segment, but not the last pointer in it.

Assuming assertion error in description:

Historical iterator tries to iterate WAL out of reservation [cache=SYSTEM_CACHEGROUP_LONGKEYS,
reservedPointer=FileWALPointer [idx=10, fileOff=448674503, len=104925], historicalPointer=FileWALPointer
[idx=10, fileOff=442844723, len=104925]]
reservedPointer is chosen incorrect, but corresponds to the valid segment {{idx=10}} (the
same as in historicalPointer).

A valid comparison of WAL pointers solved this issue. Segment number and segment offset participate
in it together (look at the FileWalPointer#comapreTo method).



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