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From "John Laban (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4095) Internal error processing get_slice (NullPointerException)
Date Wed, 28 Mar 2012 03:11:28 GMT
Internal error processing get_slice (NullPointerException)
----------------------------------------------------------

                 Key: CASSANDRA-4095
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4095
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.8
         Environment: Java(TM) SE Runtime Environment (build 1.6.0_30-b12)

            Reporter: John Laban
            Priority: Minor


I get this pretty regularly.  It seems to happen transiently on multiple nodes in my cluster,
every so often, and goes away.


ERROR [Thrift:45] 2012-03-26 19:59:12,024 Cassandra.java (line 3041) Internal error processing
get_slice
java.lang.NullPointerException
        at org.apache.cassandra.db.SliceFromReadCommand.maybeGenerateRetryCommand(SliceFromReadCommand.java:76)
        at org.apache.cassandra.service.StorageProxy.fetchRows(StorageProxy.java:724)
        at org.apache.cassandra.service.StorageProxy.read(StorageProxy.java:564)
        at org.apache.cassandra.thrift.CassandraServer.readColumnFamily(CassandraServer.java:128)
        at org.apache.cassandra.thrift.CassandraServer.getSlice(CassandraServer.java:283)
        at org.apache.cassandra.thrift.CassandraServer.multigetSliceInternal(CassandraServer.java:365)
        at org.apache.cassandra.thrift.CassandraServer.get_slice(CassandraServer.java:326)
        at org.apache.cassandra.thrift.Cassandra$Processor$get_slice.process(Cassandra.java:3033)
        at org.apache.cassandra.thrift.Cassandra$Processor.process(Cassandra.java:2889)
        at org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:187)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)



The line in question is (I think) the one below, so it looks like the column family reference
for a row can sometimes be null?

    int liveColumnsInRow = row != null ? row.cf.getLiveColumnCount() : 0;



Here is my column family (on 1.0.8):

    ColumnFamily: WorkQueue (Super)
      Key Validation Class: org.apache.cassandra.db.marshal.UTF8Type
      Default column value validator: org.apache.cassandra.db.marshal.UTF8Type
      Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type/org.apache.cassandra.db.marshal.UTF8Type
      Row cache size / save period in seconds / keys to save : 0.0/0/all
      Row Cache Provider: org.apache.cassandra.cache.ConcurrentLinkedHashCacheProvider
      Key cache size / save period in seconds: 0.0/0
      GC grace seconds: 0
      Compaction min/max thresholds: 4/32
      Read repair chance: 0.0
      Replicate on write: false
      Bloom Filter FP chance: default
      Built indexes: []
      Compaction Strategy: org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy


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