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From "Hau Phan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12215) Read failure in cqlsh
Date Fri, 15 Jul 2016 18:54:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379911#comment-15379911
] 

Hau Phan commented on CASSANDRA-12215:
--------------------------------------

CREATE TABLE adsfadfafd.friendships_by_owner (
    owner_id uuid,
    friend_id uuid,
    created_at timestamp,
    friend_status text,
    friend_username text,
    status text,
    temp_friend boolean,
    username text static,
    PRIMARY KEY (owner_id, friend_id)
) WITH CLUSTERING ORDER BY (friend_id DESC)
    AND bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
    AND comment = ''
    AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
'max_threshold': '32', 'min_threshold': '4'}
    AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}
    AND crc_check_chance = 1.0
    AND dclocal_read_repair_chance = 0.1
    AND default_time_to_live = 0
    AND gc_grace_seconds = 0
    AND max_index_interval = 2048
    AND memtable_flush_period_in_ms = 0
    AND min_index_interval = 128
    AND read_repair_chance = 0.0
    AND speculative_retry = '99PERCENTILE';

> 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
>             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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