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From "Jeff Jirsa (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13282) Commitlog replay may fail if last mutation is within 4 bytes of end of segment
Date Wed, 01 Mar 2017 05:02:45 GMT
Jeff Jirsa created CASSANDRA-13282:
--------------------------------------

             Summary: Commitlog replay may fail if last mutation is within 4 bytes of end
of segment
                 Key: CASSANDRA-13282
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13282
             Project: Cassandra
          Issue Type: Bug
            Reporter: Jeff Jirsa
            Assignee: Jeff Jirsa
             Fix For: 3.0.x, 3.11.x, 4.x


Following CASSANDRA-9749 , stricter correctness checks on commitlog replay can incorrectly
detect "corrupt segments" and stop commitlog replay (and potentially stop cassandra, depending
on the configured policy). In {{CommitlogReplayer#replaySyncSection}} we try to read a 4 byte
int {{serializedSize}}, and if it's 0 (which will happen due to zeroing when the segment was
created), we continue on to the next segment. However, it appears that if a mutation is sized
such that it ends with 1, 2, or 3 bytes remaining in the segment, we'll hit pass the {{isEOF}}
on the while loop but fail to read the {{serializedSize}} int, and fail. 



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