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From "Tyler Hobbs (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-10614) AsertionError while flushing memtables
Date Wed, 28 Oct 2015 16:43:27 GMT
Tyler Hobbs created CASSANDRA-10614:

             Summary: AsertionError while flushing memtables
                 Key: CASSANDRA-10614
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: Tyler Hobbs
            Priority: Critical
             Fix For: 3.0.0

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( ~[main/:na]
	at org.apache.cassandra.db.transform.BaseRows.hasNext( ~[main/:na]
	at org.apache.cassandra.db.transform.UnfilteredRows.isEmpty( ~[main/:na]
	at org.apache.cassandra.db.ColumnIndex.writeAndBuildIndex( ~[main/:na]
	at ~[main/:na]
	at org.apache.cassandra.db.Memtable$FlushRunnable.writeSortedContents(
	at org.apache.cassandra.db.Memtable$FlushRunnable.runMayThrow( ~[main/:na]
	at ~[main/:na]
	at org.apache.cassandra.db.ColumnFamilyStore$ ~[main/:na]
	at java.util.concurrent.ThreadPoolExecutor.runWorker( ~[na:1.8.0_45]
	at java.util.concurrent.ThreadPoolExecutor$ ~[na:1.8.0_45]
	at ~[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

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