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From Viktor Jevdokimov <>
Subject Internal error processing batch_mutate java.util.ConcurrentModificationException
Date Fri, 03 Feb 2012 15:49:55 GMT
What may be cause of the following exception in 1.0.7 Cassandra:

ERROR [Thrift:134] 2012-02-03 15:51:02,800 (line 3462) Internal error processing
        at java.util.AbstractList$Itr.checkForComodification(
        at java.util.AbstractList$
        at org.apache.cassandra.utils.FBUtilities.waitOnFutures(
        at org.apache.cassandra.service.AbstractWriteResponseHandler.waitForHints(
        at org.apache.cassandra.service.AbstractWriteResponseHandler.get(
        at org.apache.cassandra.service.StorageProxy.mutate(
        at org.apache.cassandra.thrift.CassandraServer.doInsert(
        at org.apache.cassandra.thrift.CassandraServer.internal_batch_mutate(
        at org.apache.cassandra.thrift.CassandraServer.batch_mutate(
        at org.apache.cassandra.thrift.Cassandra$Processor$batch_mutate.process(
        at org.apache.cassandra.thrift.Cassandra$Processor.process(
        at org.apache.cassandra.thrift.CustomTThreadPoolServer$
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(
        at java.util.concurrent.ThreadPoolExecutor$

Best regards/ Pagarbiai

Viktor Jevdokimov

Senior Developer


Phone: +370 5 212 3063. Fax: +370 5 261 0453

J. Jasinskio 16C, LT-01112 Vilnius, Lithuania

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