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  1. Cassandra
  2. CASSANDRA-10614

AssertionError while flushing memtables

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    • Severity:
      Critical

      Description

      While running mvbench against a single local node, I noticed this stacktrace showing up multiple times in the logs:

      ERROR 16:40:01 Exception in thread Thread[MemtableFlushWriter:1,5,main]
      java.lang.AssertionError: null
      	at org.apache.cassandra.db.rows.Rows.collectStats(Rows.java:70) ~[main/:na]
      	at org.apache.cassandra.io.sstable.format.big.BigTableWriter$StatsCollector.applyToRow(BigTableWriter.java:197) ~[main/:na]
      	at org.apache.cassandra.db.transform.BaseRows.hasNext(BaseRows.java:116) ~[main/:na]
      	at org.apache.cassandra.db.transform.UnfilteredRows.isEmpty(UnfilteredRows.java:38) ~[main/:na]
      	at org.apache.cassandra.db.ColumnIndex.writeAndBuildIndex(ColumnIndex.java:49) ~[main/:na]
      	at org.apache.cassandra.io.sstable.format.big.BigTableWriter.append(BigTableWriter.java:149) ~[main/:na]
      	at org.apache.cassandra.io.sstable.SimpleSSTableMultiWriter.append(SimpleSSTableMultiWriter.java:45) ~[main/:na]
      	at org.apache.cassandra.io.sstable.SSTableTxnWriter.append(SSTableTxnWriter.java:52) ~[main/:na]
      	at org.apache.cassandra.db.Memtable$FlushRunnable.writeSortedContents(Memtable.java:389) ~[main/:na]
      	at org.apache.cassandra.db.Memtable$FlushRunnable.runMayThrow(Memtable.java:352) ~[main/:na]
      	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[main/:na]
      	at com.google.common.util.concurrent.MoreExecutors$DirectExecutorService.execute(MoreExecutors.java:299) ~[guava-18.0.jar:na]
      	at org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1037) ~[main/:na]
      	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_45]
      	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_45]
      	at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_45]
      

      To reproduce, run mvbench with the regular schema and the following arguments:

      mvn exec:java -Dexec.args="--num-users 100000 --num-songs 1000000 --num-artists 10000 -n 500000 --endpoint 127.0.0.1"
      

        Attachments

        1. debug.log
          1001 kB
          Alan Boudreault
        2. system.log
          125 kB
          Alan Boudreault

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              • Assignee:
                thobbs Tom Hobbs
                Reporter:
                thobbs Tom Hobbs
                Authors:
                Tom Hobbs
                Reviewers:
                T Jake Luciani
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                • Created:
                  Updated:
                  Resolved: