[CASSANDRA-12215] NullPointerException during Compaction

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Duplicate
• Fix Version/s: 3.0.9
• Component/s: Local/Compaction

Environment

Cassandra 3.0.8, cqlsh 5.0.1

• Severity: Normal
• Assignee: Unassigned
• Reporter: Hau Phan
• Created: 15/Jul/16 18:48
• Updated: 01/Aug/21 12:37
• Resolved: 28/Jul/16 14:33

Description

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:

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]

Doing a sstabledump -d shows a few rows with the column value of "<tombstone>", telling me compaction doesn't seem to be working correctly.

1. nodetool compactionstats
   pending tasks: 1

attempting to run a compaction gets:

1. 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.

Issue Links

• duplicates: CASSANDRA-11988 NullPointerException when reading/compacting table