Hello,
Recently we changed compaction strategy fora table to LCS from the default
STCS. While bootstrapping a node , we are getting following Exception in the
logs:
ERROR [CompactionExecutor:81] 2016-05-11 13:48:54,694 CassandraDaemon.java
(line 258) Exception in thread Thread[CompactionExecutor:81,1,main]
java.lang.RuntimeException: Last written key DecoratedKey(-2711050270696519088,
623330333a313a35) >= current key DecoratedKey(-8631371593982690738,
623437393a313a30) writing into /cassandra/data/main/myCF/myCF-tmp-jb-326-Data.db
at
org.apache.cassandra.io.sstable.SSTableWriter.beforeAppend(SSTableWriter.java:143)
at
org.apache.cassandra.io.sstable.SSTableWriter.append(SSTableWriter.java:166)
at
org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:167)
at
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
at
org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:60)
at
org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:59)
at
org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionTask.run(CompactionManager.java:198)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
INFO [CompactionExecutor:68] 2016-05-11 14:10:28,957 ColumnFamilyStore.java
(line 795) Enqueuing flush of Memtable-compactions_in_progress@541886922(0/0
serialized/live bytes, 1 ops)
Questions:
1. Are these exceptions due to data corruption ?
2. I am unable to reproduce the problem. How can I reproduce the
Exception? Is there any specific case when such exceptions are raised?
3. Without reproducing the Exception, how can I test the patch available
at related JIRA : https://issues.apache.org/jira/browse/CASSANDRA-9935
Thanks,
Prakash Chauhan.
