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From "Hau Phan (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-12215) NullPointerException during Compaction
Date Thu, 21 Jul 2016 16:25:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15387984#comment-15387984
] 

Hau Phan edited comment on CASSANDRA-12215 at 7/21/16 4:25 PM:
---------------------------------------------------------------

Implemented the patch from CASSANDRA-11988, the noticeable change is when gc_grace_seconds
is set to a year, a select * will now show the data + tombstone'd partitions.  

With gc_grace_seconds set to 1 day, still getting the java.lang.NullPointerException error.


was (Author: nothau):
Implemented the patch from CASSANDRA-11988, the noticeable change is when gc_grace_seconds
is set to a year, a select * will now show the data + tombstone'd partitions.  



> 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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