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Hau Phan commented on CASSANDRA-12215: -------------------------------------- Sure, with tracing on; here's the error message of the select * from friendships_by_owner. {code} 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'} {code} Here's logs from system.log when the error occurs: {code} WARN [SharedPool-Worker-2] 2016-07-22 09:24:47,589 AbstractLocalAwareExecutorService.java:169 - Uncaught exception on thread Thread[SharedPool-Worker-2,5,main]: {} java.lang.RuntimeException: java.lang.NullPointerException at org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2453) ~[main/:na] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_65] at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164) ~[main/:na] at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:136) [main/:na] at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [main/:na] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65] Caused by: java.lang.NullPointerException: null {code} > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)