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https://issues.apache.org/jira/browse/CASSANDRA-8851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14367727#comment-14367727
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Benedict commented on CASSANDRA-8851:
-------------------------------------
I've introduced a unit test to check index scan positions after downsampling.
It's not totally exhaustive, but it indicates it's most likely ok (and would be
tricky to explain this behaviour anyway, since both operations use the same
summary)
> Uncaught exception on thread Thread[SharedPool-Worker-16,5,main] after
> upgrade to 2.1.3
> ---------------------------------------------------------------------------------------
>
> Key: CASSANDRA-8851
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8851
> Project: Cassandra
> Issue Type: Bug
> Environment: ubuntu
> Reporter: Tobias Schlottke
> Assignee: Benedict
> Priority: Critical
> Fix For: 2.1.4
>
> Attachments: schema.txt, system.log.gz
>
>
> Hi there,
> after upgrading to 2.1.3 we've got the following error every few seconds:
> {code}
> WARN [SharedPool-Worker-16] 2015-02-23 10:20:36,392
> AbstractTracingAwareExecutorService.java:169 - Uncaught exception on thread
> Thread[SharedPool-Worker-16,5,main]: {}
> java.lang.AssertionError: null
> at org.apache.cassandra.io.util.Memory.size(Memory.java:307)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.utils.obs.OffHeapBitSet.capacity(OffHeapBitSet.java:61)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at org.apache.cassandra.utils.BloomFilter.indexes(BloomFilter.java:74)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.utils.BloomFilter.isPresent(BloomFilter.java:98)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.io.sstable.SSTableReader.getPosition(SSTableReader.java:1366)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.io.sstable.SSTableReader.getPosition(SSTableReader.java:1350)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.db.columniterator.SSTableSliceIterator.<init>(SSTableSliceIterator.java:41)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.db.filter.SliceQueryFilter.getSSTableColumnIterator(SliceQueryFilter.java:185)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.db.filter.QueryFilter.getSSTableColumnIterator(QueryFilter.java:62)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.db.CollationController.collectAllData(CollationController.java:273)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.db.CollationController.getTopLevelColumns(CollationController.java:62)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1915)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1748)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at org.apache.cassandra.db.Keyspace.getRow(Keyspace.java:342)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:57)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.db.ReadVerbHandler.doVerb(ReadVerbHandler.java:47)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> ~[na:1.7.0_45]
> at
> org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164)
> ~[apache-cassandra-2.1.3.jar:2.1.3]
> at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)
> [apache-cassandra-2.1.3.jar:2.1.3]
> at java.lang.Thread.run(Thread.java:744) [na:1.7.0_45]
> {code}
> This seems to crash the compactions and pushes up server load and piles up
> compactions.
> Any idea / possible workaround?
> Best,
> Tobias
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