Hau Phan created CASSANDRA-12215:
------------------------------------
Summary: Read failure in cqlsh
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
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.
# 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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