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  1. Cassandra
  2. CASSANDRA-4206

AssertionError: originally calculated column size of 629444349 but now it is 588008950



    • Bug
    • Status: Resolved
    • Normal
    • Resolution: Fixed
    • None
    • None
    • None
    • Debian Squeeze Linux, kernel 2.6.32, sun-java6-bin 6.26-0squeeze1

    • Normal


      I've 4 node cluster of Cassandra 1.0.9. There is a rfTest3 keyspace with RF=3 and one CF with two secondary indexes. I'm importing data into this CF using Hadoop Mapreduce job, each row has less than 10 colkumns. From JMX:
      MaxRowSize: 1597
      MeanRowSize: 369

      And there are some tens of millions of rows.

      It's write-heavy usage and there is a big pressure on each node, there are quite some dropped mutations on each node. After ~12 hours of inserting I see these assertion exceptiona on 3 out of four nodes:

      ERROR 06:25:40,124 Fatal exception in thread Thread[HintedHandoff:1,1,main]
      java.lang.RuntimeException: java.util.concurrent.ExecutionException:
      java.lang.AssertionError: originally calculated column size of 629444349 but now it is 588008950
             at org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpointInternal(HintedHandOffManager.java:388)
             at org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpoint(HintedHandOffManager.java:256)
             at org.apache.cassandra.db.HintedHandOffManager.access$300(HintedHandOffManager.java:84)
             at org.apache.cassandra.db.HintedHandOffManager$3.runMayThrow(HintedHandOffManager.java:437)
             at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
             at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
             at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
             at java.lang.Thread.run(Thread.java:662)
      Caused by: java.util.concurrent.ExecutionException:
      java.lang.AssertionError: originally calculated column size of
      629444349 but now it is 588008950
             at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
             at java.util.concurrent.FutureTask.get(FutureTask.java:83)
             at org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpointInternal(HintedHandOffManager.java:384)
             ... 7 more
      Caused by: java.lang.AssertionError: originally calculated column size
      of 629444349 but now it is 588008950
             at org.apache.cassandra.db.compaction.LazilyCompactedRow.write(LazilyCompactedRow.java:124)
             at org.apache.cassandra.io.sstable.SSTableWriter.append(SSTableWriter.java:160)
             at org.apache.cassandra.db.compaction.CompactionTask.execute(CompactionTask.java:161)
             at org.apache.cassandra.db.compaction.CompactionManager$7.call(CompactionManager.java:380)
             at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
             at java.util.concurrent.FutureTask.run(FutureTask.java:138)
             ... 3 more

      Few lines regarding Hints from the output.log:

       INFO 06:21:26,202 Compacting large row system/HintsColumnFamily:70000000000000000000000000000000 (1712834057 bytes) incrementally
       INFO 06:22:52,610 Compacting large row system/HintsColumnFamily:10000000000000000000000000000000 (2616073981 bytes) incrementally
       INFO 06:22:59,111 flushing high-traffic column family CFS(Keyspace='system', ColumnFamily='HintsColumnFamily') (estimated 305147360 bytes)
       INFO 06:22:59,813 Enqueuing flush of Memtable-HintsColumnFamily@833933926(3814342/305147360 serialized/live bytes, 7452 ops)
       INFO 06:22:59,814 Writing Memtable-HintsColumnFamily@833933926(3814342/305147360 serialized/live bytes, 7452 ops)

      I think the problem may be somehow connected to an IntegerType secondary index. I had a different problem with CF with two secondary indexes, the first UTF8Type, the second IntegerType. After a few hours of inserting data in the afternoon and midnight repair+compact, the next day I couldn't find any row using the IntegerType secondary index. The output was like this:

      [default@rfTest3] get IndexTest where col1 = '3230727:http://zaskolak.cz/download.php';
      RowKey: 3230727:8383582:http://zaskolak.cz/download.php
      => (column=col1, value=3230727:http://zaskolak.cz/download.php, timestamp=1335348630332000)
      => (column=col2, value=8383582, timestamp=1335348630332000)
      RowKey: 3230727:8383583:http://zaskolak.cz/download.php
      => (column=col1, value=3230727:http://zaskolak.cz/download.php, timestamp=1335348449078000)
      => (column=col2, value=8383583, timestamp=1335348449078000)
      RowKey: 3230727:8383579:http://zaskolak.cz/download.php
      => (column=col1, value=3230727:http://zaskolak.cz/download.php, timestamp=1335348778577000)
      => (column=col2, value=8383579, timestamp=1335348778577000)
      3 Rows Returned.
      Elapsed time: 292 msec(s).
      [default@rfTest3] get IndexTest where col2 = 8383583;
      0 Row Returned.
      Elapsed time: 7 msec(s

      You can see there really is an 8383583 in col2 in on of the listed rows, but the search by secondary index returns nothing.

      The Assert Exception also happend only on CF with the secondary index of IntegerType. There were also secondary indexes of UTF8Type and
      LongType types. It's the first time I've tried secondary indexes of other type than UTF8Type.



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              patrik.modesto Patrik Modesto
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