Unsustainable Thread Accumulation in ParallelCompactionIterable.Reducer
ThreadPoolExecutor
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Key: CASSANDRA-3711
URL: https://issues.apache.org/jira/browse/CASSANDRA-3711
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 1.0.5
Environment: Linux version 2.6.32-71.29.1.el6.x86_64
([email protected]) (gcc version 4.4.4 20100726 (Red Hat
4.4.4-13) (GCC) ) #1 SMP Mon Jun 27 19:49:27 BST 2011
Reporter: Caleb William Rackliffe
With multithreaded compaction enabled, it looks like Reducer creates a new
thread pool for every compaction. These pools seem to just sit around - i.e.
"executor.shutdown()" never gets called and the Threads live forever waiting
for tasks that will never come. For instance...
Name: CompactionReducer:1
State: TIMED_WAITING on
java.util.concurrent.SynchronousQueue$TransferStack@72938aea
Total blocked: 0 Total waited: 1
Stack trace:
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:359)
java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:942)
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1043)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1103)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
java.lang.Thread.run(Thread.java:722)
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