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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-3085) Race condition in sstable reference counting
Date Fri, 26 Aug 2011 19:23:29 GMT
Race condition in sstable reference counting
--------------------------------------------

                 Key: CASSANDRA-3085
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3085
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0
            Reporter: Jonathan Ellis
            Assignee: Jonathan Ellis
            Priority: Critical
             Fix For: 1.0


DataTracker gives us an atomic View of memtable/sstables, but acquiring references is not
atomic.  So it is possible to acquire references to an SSTableReader object that is no longer
valid, as in this example:

View V contains sstables {A, B}.  We attempt a read in thread T using this View.
Meanwhile, A and B are compacted to {C}, yielding View W.  No references exist to A or B so
they are cleaned up.
Back in thread T we acquire references to A and B.  This does not cause an error, but it will
when we attempt to read from them next.

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