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https://issues.apache.org/jira/browse/CASSANDRA-12215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15397608#comment-15397608
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Sylvain Lebresne commented on CASSANDRA-12215:
----------------------------------------------
Unfortunately, the stack provided above looks incomplete. In particular, there
should be more after the {{Caused by:}} line and that's the part that would
allow us to know what's going on.
But I will also note that despite being incomplete from a diagnostic point of
view, that 2nd stack track is clearly not the same one than in the description.
So to avoid confusion, I'm going to close that ticket as duplicate of
CASSANDRA-11988, because as far as the ticket description goes, it is a
duplicate.
But please, [~nothau], can you open a new ticket for your new exception, the
one you get with CASSANDRA-11988 applied. Thanks.
> NullPointerException during Compaction
> --------------------------------------
>
> Key: CASSANDRA-12215
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12215
> Project: Cassandra
> Issue Type: Bug
> Components: Compaction
> Environment: Cassandra 3.0.8, cqlsh 5.0.1
> Reporter: Hau Phan
> Fix For: 3.0.x
>
>
> Running 3.0.8 on a single standalone node with cqlsh 5.0.1, the keyspace RF =
> 1 and class SimpleStrategy.
> Attempting to run a 'select * from <table>' and receiving this error:
> ReadFailure: code=1300 [Replica(s) failed to execute read] message="Operation
> failed - received 0 responses and 1 failures" info={'failures': 1,
> 'received_responses': 0, 'required_responses': 1, 'consistency': 'ONE'}
> Cassandra system.log prints this:
> {code}
> ERROR [CompactionExecutor:5] 2016-07-15 13:42:13,219 CassandraDaemon.java:201
> - Exception in thread Thread[CompactionExecutor:5,1,main]
> java.lang.NullPointerException: null
> at
> org.apache.cassandra.db.transform.UnfilteredRows.isEmpty(UnfilteredRows.java:58)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.partitions.PurgeFunction.applyToPartition(PurgeFunction.java:64)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.partitions.PurgeFunction.applyToPartition(PurgeFunction.java:24)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.transform.BasePartitions.hasNext(BasePartitions.java:96)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.compaction.CompactionIterator.hasNext(CompactionIterator.java:226)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:177)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:78)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:60)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:263)
> ~[apache-cassandra-3.0.8.jar:3.0.8]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> ~[na:1.8.0_65]
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> ~[na:1.8.0_65]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> ~[na:1.8.0_65]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [na:1.8.0_65]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
> {code}
> Doing a sstabledump -d shows a few rows with the column value of
> "<tombstone>", telling me compaction doesn't seem to be working correctly.
> # nodetool compactionstats
> pending tasks: 1
> attempting to run a compaction gets:
> # nodetool compact <table> <cf>
> error: null
> -- StackTrace --
> java.lang.NullPointerException
> at
> org.apache.cassandra.db.transform.UnfilteredRows.isEmpty(UnfilteredRows.java:58)
> at
> org.apache.cassandra.db.partitions.PurgeFunction.applyToPartition(PurgeFunction.java:64)
> at
> org.apache.cassandra.db.partitions.PurgeFunction.applyToPartition(PurgeFunction.java:24)
> at
> org.apache.cassandra.db.transform.BasePartitions.hasNext(BasePartitions.java:96)
> at
> org.apache.cassandra.db.compaction.CompactionIterator.hasNext(CompactionIterator.java:226)
> at
> org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:177)
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> at
> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:78)
> at
> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:60)
> at
> org.apache.cassandra.db.compaction.CompactionManager$8.runMayThrow(CompactionManager.java:606)
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Since the table is pretty small, I can do a copy to, truncate the table, and
> copy from, and the table is fine. But my concern is if compaction fails to
> remove those rows, and the table will eventually be very large in a
> production environment, the copy, truncate, and copy will no longer be an
> option.
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