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https://issues.apache.org/jira/browse/CASSANDRA-3957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215980#comment-13215980
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Jonathan Ellis commented on CASSANDRA-3957:
-------------------------------------------
I note that this is the Periodic commitlog executor, which does NOT block for
CommitLog.add. So, if the CF is serialized (later) while another thread
modifies it, we could hit this error.
We don't modify the mutation CF directly in CFS.apply, since we clone into the
arena allocator.
The only place I see where we modify the mutation CF is in
ignoreObsoleteMutations... but that only happens for indexed columns, so that
can't be the cause here since it involves SuperColumns.
(Note that the mutation CF won't be changed by updateRowCache, since the
mutation CF is never inserted into the cache; it's only used to add to an
existing cache row, if one exists.)
Am I missing something?
Perhaps it would be best to start by creating a test to serialize the above
RowMutation and see if it reproduces in the absence of concurrent activity, to
rule out the possibility of serializedSize simply having a bug w/ SuperColumns.
> Supercolumn serialization assertion failure
> -------------------------------------------
>
> Key: CASSANDRA-3957
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3957
> Project: Cassandra
> Issue Type: Bug
> Reporter: Jonathan Ellis
> Assignee: Yuki Morishita
> Fix For: 1.0.9
>
>
> As reported at
> http://mail-archives.apache.org/mod_mbox/cassandra-user/201202.mbox/%3CCADJL=w5kH5TEQXOwhTn5Jm3cmR4Rj=nfjcqlryxv7plyasi...@mail.gmail.com%3E,
> {noformat}
> ERROR 10:51:44,282 Fatal exception in thread
> Thread[COMMIT-LOG-WRITER,5,main]
> java.lang.AssertionError: Final buffer length 4690 to accomodate data size
> of 2347 (predicted 2344) for RowMutation(keyspace='Player',
> key='36336138643338652d366162302d343334392d383466302d356166643863353133356465',
> modifications=[ColumnFamily(PlayerCity [SuperColumn(owneditem_1019
> []),SuperColumn(owneditem_1024 []),SuperColumn(owneditem_1026
> []),SuperColumn(owneditem_1074 []),SuperColumn(owneditem_1077
> []),SuperColumn(owneditem_1084 []),SuperColumn(owneditem_1094
> []),SuperColumn(owneditem_1130 []),SuperColumn(owneditem_1136
> []),SuperColumn(owneditem_1141 []),SuperColumn(owneditem_1142
> []),SuperColumn(owneditem_1145 []),SuperColumn(owneditem_1218
> [636f6e6e6563746564:false:5@1329648704269002
> ,63757272656e744865616c7468:false:3@1329648704269006
> ,656e64436f6e737472756374696f6e54696d65:false:13@1329648704269007
> ,6964:false:4@1329648704269000,6974656d4964:false:15@1329648704269001
> ,6c61737444657374726f79656454696d65:false:1@1329648704269008
> ,6c61737454696d65436f6c6c6563746564:false:13@1329648704269005
> ,736b696e4964:false:7@1329648704269009,78:false:4@1329648704269003
> ,79:false:3@1329648704269004,]),SuperColumn(owneditem_133
> []),SuperColumn(owneditem_134 []),SuperColumn(owneditem_135
> []),SuperColumn(owneditem_141 []),SuperColumn(owneditem_147
> []),SuperColumn(owneditem_154 []),SuperColumn(owneditem_159
> []),SuperColumn(owneditem_171 []),SuperColumn(owneditem_253
> []),SuperColumn(owneditem_422 []),SuperColumn(owneditem_438
> []),SuperColumn(owneditem_515 []),SuperColumn(owneditem_521
> []),SuperColumn(owneditem_523 []),SuperColumn(owneditem_525
> []),SuperColumn(owneditem_562 []),SuperColumn(owneditem_61
> []),SuperColumn(owneditem_634 []),SuperColumn(owneditem_636
> []),SuperColumn(owneditem_71 []),SuperColumn(owneditem_712
> []),SuperColumn(owneditem_720 []),SuperColumn(owneditem_728
> []),SuperColumn(owneditem_787 []),SuperColumn(owneditem_797
> []),SuperColumn(owneditem_798 []),SuperColumn(owneditem_838
> []),SuperColumn(owneditem_842 []),SuperColumn(owneditem_847
> []),SuperColumn(owneditem_849 []),SuperColumn(owneditem_851
> []),SuperColumn(owneditem_852 []),SuperColumn(owneditem_853
> []),SuperColumn(owneditem_854 []),SuperColumn(owneditem_857
> []),SuperColumn(owneditem_858 []),SuperColumn(owneditem_874
> []),SuperColumn(owneditem_884 []),SuperColumn(owneditem_886
> []),SuperColumn(owneditem_908 []),SuperColumn(owneditem_91
> []),SuperColumn(owneditem_911 []),SuperColumn(owneditem_930
> []),SuperColumn(owneditem_934 []),SuperColumn(owneditem_937
> []),SuperColumn(owneditem_944 []),SuperColumn(owneditem_945
> []),SuperColumn(owneditem_962 []),SuperColumn(owneditem_963
> []),SuperColumn(owneditem_964 []),])])
> at
> org.apache.cassandra.utils.FBUtilities.serialize(FBUtilities.java:682)
> at
> org.apache.cassandra.db.RowMutation.getSerializedBuffer(RowMutation.java:279)
> at
> org.apache.cassandra.db.commitlog.CommitLogSegment.write(CommitLogSegment.java:122)
> at
> org.apache.cassandra.db.commitlog.CommitLog$LogRecordAdder.run(CommitLog.java:599)
> at
> org.apache.cassandra.db.commitlog.PeriodicCommitLogExecutorService$1.runMayThrow(PeriodicCommitLogExecutorService.java:49)
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
> at java.lang.Thread.run(Thread.java:662)
> {noformat}
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