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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5284) Possible assertion triggered in SliceFromReadCommand
Date Mon, 25 Feb 2013 15:56:12 GMT
Sylvain Lebresne created CASSANDRA-5284:
-------------------------------------------

             Summary: Possible assertion triggered in SliceFromReadCommand
                 Key: CASSANDRA-5284
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5284
             Project: Cassandra
          Issue Type: Bug
            Reporter: Sylvain Lebresne
            Assignee: Sylvain Lebresne
            Priority: Minor
             Fix For: 1.1.11


In SliceFromReadCommand.maybeGenerateRetryCommand, the following assertion
{noformat}
assert maxLiveColumns <= count;
{noformat}
may actually fail. Namely, it asserts that no node has returned more columns that what was
asked for, which in general is true, but can not be if an expiring column is counted as dead
by the replica (but still send as a tombstone) but, due to clock difference, is actually counted
live by the coordinator.

I note that this is similar to CASSANDRA-5149 in that fixing CASSANDRA-5149 would fix this
too, but in the meantime, this edge case is harmless so there is probably not much point in
keeping the assertion.

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