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https://issues.apache.org/jira/browse/CASSANDRA-10614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989981#comment-14989981
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Tyler Hobbs commented on CASSANDRA-10614:
-----------------------------------------
bq. Ah I get it. Can we optimize for the single row case? since we know it will
not have this issue and the initial check will suffice?
Sure. I've pushed [another
commit|https://github.com/thobbs/cassandra/commit/4e89a92f25e5f4c1dae640f06a301270c3e34d4f]
to do that.
> AssertionError while flushing memtables
> ---------------------------------------
>
> Key: CASSANDRA-10614
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10614
> Project: Cassandra
> Issue Type: Bug
> Components: Local Write-Read Paths
> Reporter: Tyler Hobbs
> Assignee: Tyler Hobbs
> Priority: Critical
> Fix For: 3.0.0
>
> Attachments: debug.log, system.log
>
>
> While running mvbench against a single local node, I noticed this stacktrace
> showing up multiple times in the logs:
> {noformat}
> 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]
> {noformat}
> To reproduce, run mvbench with the regular schema and the following arguments:
> {noformat}
> mvn exec:java -Dexec.args="--num-users 100000 --num-songs 1000000
> --num-artists 10000 -n 500000 --endpoint 127.0.0.1"
> {noformat}
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