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Posted to commits@cassandra.apache.org by "Dan Hendry (Commented) (JIRA)" <ji...@apache.org> on 2011/11/10 22:13:51 UTC
[jira] [Commented] (CASSANDRA-3482) Flush Assertion Error - CF size
changed during serialization
[ https://issues.apache.org/jira/browse/CASSANDRA-3482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148013#comment-13148013 ]
Dan Hendry commented on CASSANDRA-3482:
---------------------------------------
I should also point out that the number of columns being logged in the error, 3/4, is MUCH smaller than the expected column count based on the flushed bytes.
Just based on the usage pattern for this CF and reading the description for CASSANDRA-2503, I suspect (without any real evidence) they may be related.
> Flush Assertion Error - CF size changed during serialization
> ------------------------------------------------------------
>
> Key: CASSANDRA-3482
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3482
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.2
> Environment: RHEL 6
> java version "1.6.0_26"
> 6 node cluster
> Reporter: Dan Hendry
>
> I have seen the following assert in the logs - there are no other suspicious or unexpected log messages.
> INFO [FlushWriter:9] 2011-11-10 13:08:58,882 Memtable.java (line 237) Writing Memtable-UserData@1388955390(25676955/430716097 serialized/live bytes, 478913 ops)
> ERROR [FlushWriter:9] 2011-11-10 13:08:59,513 AbstractCassandraDaemon.java (line 133) Fatal exception in thread Thread[FlushWriter:9,5,main]
> java.lang.AssertionError: CF size changed during serialization: was 4 initially but 3 written
> at org.apache.cassandra.db.ColumnFamilySerializer.serializeForSSTable(ColumnFamilySerializer.java:94)
> at org.apache.cassandra.db.ColumnFamilySerializer.serializeWithIndexes(ColumnFamilySerializer.java:112)
> at org.apache.cassandra.io.sstable.SSTableWriter.append(SSTableWriter.java:177)
> at org.apache.cassandra.db.Memtable.writeSortedContents(Memtable.java:264)
> at org.apache.cassandra.db.Memtable.access$400(Memtable.java:47)
> at org.apache.cassandra.db.Memtable$4.runMayThrow(Memtable.java:289)
> at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> Once the error occurs, further MemtablePostFlusher tasks are blocked:
> nodetool tpstats:
> Pool Name Active Pending Completed Blocked All time blocked
> MemtablePostFlusher 1 18 16 0 0
> It *seems* that all further flushed for the particular CF (in this case UserData) will also result in the same assertion error. Restarting the node fixes the problem.
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