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Date: Tue, 21 Feb 2012 19:54:48 +0000 (UTC)
From: "Sylvain Lebresne (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-3870) Internal error processing
 batch_mutate: java.util.ConcurrentModificationException on CounterColumn
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    [ https://issues.apache.org/jira/browse/CASSANDRA-3870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212852#comment-13212852 ] 

Sylvain Lebresne commented on CASSANDRA-3870:
---------------------------------------------

Just to be clear, I'm *really* leaning towards the path of removing the 'wait for hint future' from the writeHandler (as of 3870.txt) unless someone remember a reason why that code is still useful that I've missed.
                
> Internal error processing batch_mutate: java.util.ConcurrentModificationException on CounterColumn
> --------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3870
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3870
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.0.7
>         Environment: Debian 6.0 x64
> x64 Sun Java 6u26
> Cassandra 1.0.7
> JNA
> 2 DCs, 1 ring/DC, 8 nodes/ring, RF=3/DC, Random partitioner.
> Disk access auto (mmap)
>            Reporter: Viktor Jevdokimov
>            Assignee: Aaron Morton
>              Labels: counters
>             Fix For: 1.0.8
>
>         Attachments: 3870.txt, cassandra-1.0-3870-V2.txt, cassandra-1.0-3870-V3.txt, cassandra-1.0-3870.txt
>
>
> Cassandra throws an exception below while performing batch_mutate with counter column insertion mutation to increment column with 1:
> ERROR [Thrift:134] 2012-02-03 15:51:02,800 Cassandra.java (line 3462) Internal error processing batch_mutate
> 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.utils.FBUtilities.waitOnFutures(FBUtilities.java:532)
>         at org.apache.cassandra.service.AbstractWriteResponseHandler.waitForHints(AbstractWriteResponseHandler.java:89)
>         at org.apache.cassandra.service.AbstractWriteResponseHandler.get(AbstractWriteResponseHandler.java:58)
>         at org.apache.cassandra.service.StorageProxy.mutate(StorageProxy.java:201)
>         at org.apache.cassandra.thrift.CassandraServer.doInsert(CassandraServer.java:639)
>         at org.apache.cassandra.thrift.CassandraServer.internal_batch_mutate(CassandraServer.java:590)
>         at org.apache.cassandra.thrift.CassandraServer.batch_mutate(CassandraServer.java:598)
>         at org.apache.cassandra.thrift.Cassandra$Processor$batch_mutate.process(Cassandra.java:3454)
>         at org.apache.cassandra.thrift.Cassandra$Processor.process(Cassandra.java:2889)
>         at org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:187)
>         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)
> Column family definition:
> create column family CountersColumnFamily1
>   with column_type = 'Standard'
>   and comparator = 'BytesType'
>   and default_validation_class = 'BytesType'
>   and key_validation_class = 'BytesType'
>   and rows_cached = 1000000.0
>   and row_cache_save_period = 0
>   and row_cache_keys_to_save = 2147483647
>   and keys_cached = 0.0
>   and key_cache_save_period = 14400
>   and read_repair_chance = 0.1
>   and gc_grace = 43200
>   and min_compaction_threshold = 4
>   and max_compaction_threshold = 32
>   and replicate_on_write = true
>   and row_cache_provider = 'SerializingCacheProvider'
>   and compaction_strategy = 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy';

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