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https://issues.apache.org/jira/browse/CASSANDRA-4231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13271974#comment-13271974
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Dave Brosius commented on CASSANDRA-4231:
-----------------------------------------
it would seem the endpoint list is changing out from under the RangeClient as
the list is referenced shared with the ringCache.
> ConcurrentModificationException while writing mutations with
> ColumnFamilyRecordWrite
> ------------------------------------------------------------------------------------
>
> Key: CASSANDRA-4231
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4231
> Project: Cassandra
> Issue Type: Bug
> Components: Hadoop
> Affects Versions: 1.0.10
> Environment: Debian Squeeze, one local cassandra node
> Reporter: bert Passek
>
> Hello,
> we are using mapreduce jobs for writing data into cassandra. Sometimes the
> job fails because of a concurrent modification exception.
> java.io.IOException: java.util.ConcurrentModificationException
> at
> org.apache.cassandra.hadoop.ColumnFamilyRecordWriter$RangeClient.run(ColumnFamilyRecordWriter.java:307)
> Caused by: java.util.ConcurrentModificationException
> at
> java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> at java.util.AbstractList$Itr.next(AbstractList.java:343)
> at org.apache.cassandra.thrift.SuperColumn.write(SuperColumn.java:440)
> at
> org.apache.cassandra.thrift.ColumnOrSuperColumn.write(ColumnOrSuperColumn.java:561)
> at org.apache.cassandra.thrift.Mutation.write(Mutation.java:384)
> at
> org.apache.cassandra.thrift.Cassandra$batch_mutate_args.write(Cassandra.java:19021)
> at
> org.apache.cassandra.thrift.Cassandra$Client.send_batch_mutate(Cassandra.java:1018)
> at
> org.apache.cassandra.thrift.Cassandra$Client.batch_mutate(Cassandra.java:1008)
> at
> org.apache.cassandra.hadoop.ColumnFamilyRecordWriter$RangeClient.run(ColumnFamilyRecordWriter.java:299)
> We were using Cassandra 1.0.8 for quite a long time without such problems.
> Regards Bert Passek
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