SSTable cleanup killed by IllegalStateException
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Key: CASSANDRA-1458
URL: https://issues.apache.org/jira/browse/CASSANDRA-1458
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 0.7 beta 1
Environment: trunk from 2010-08-31
Reporter: Christopher Gist
Priority: Minor
Compacted SSTables were not being deleted even after a forced GC. The following
stack traces were observed:
ERROR [SSTABLE-CLEANUP-TIMER] 2010-09-01 15:54:07,254 CassandraDaemon.java
(line 85) Uncaught exception in thread Thread[SSTABLE-CLEANUP-TIMER,5,main]
java.lang.IllegalStateException: Task already scheduled or cancelled
at java.util.Timer.sched(Timer.java:380)
at java.util.Timer.schedule(Timer.java:192)
at
org.apache.cassandra.io.sstable.SSTableDeletingReference$CleanupTask.run(SSTableDeletingReference.java:86)
at java.util.TimerThread.mainLoop(Timer.java:534)
at java.util.TimerThread.run(Timer.java:484)
ERROR [SSTABLE-DELETER] 2010-09-01 16:20:22,587 CassandraDaemon.java (line 85)
Uncaught exception in thread Thread[SSTABLE-DELETER,5,main]
java.lang.IllegalStateException: Timer already cancelled.
at java.util.Timer.sched(Timer.java:376)
at java.util.Timer.schedule(Timer.java:192)
at
org.apache.cassandra.io.sstable.SSTableDeletingReference.cleanup(SSTableDeletingReference.java:70)
at
org.apache.cassandra.io.sstable.SSTableReader$1$1.run(SSTableReader.java:85)
at java.lang.Thread.run(Thread.java:636)
If the SSTableDeletingReference$CleanupTask cannot delete a file, it
reschedules itself for later. TimerTasks (which CleanupTask subclasses) are
intended to be scheduled only once and will cause an IllegalStateException in
the timer when it tries to schedule itself again. The exception causes timer to
effectively cancel itself and the next attempt to schedule a task will cause an
IllegalStateException in the SSTABLE-DELETER.
It appears this could be fixed by scheduling a new CleanupTask instead of the
same one that failed (SSTableDeletingReference.java:86).
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