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https://issues.apache.org/jira/browse/CASSANDRA-15902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Swen Fuhrmann reassigned CASSANDRA-15902:
-----------------------------------------
Assignee: Swen Fuhrmann
> OOM because repair session thread not closed when terminating repair
> --------------------------------------------------------------------
>
> Key: CASSANDRA-15902
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15902
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Repair
> Reporter: Swen Fuhrmann
> Assignee: Swen Fuhrmann
> Priority: Normal
>
> In our cluster, after a while some nodes running slowly out of memory. On
> that nodes we observed that Cassandra Reaper cancel repairs with a JMX call
> to {{StorageServiceMBean.forceTerminateAllRepairSessions()}} because reaching
> timeout of 30 min.
> In the memory heap dump we see >100 instances of
> {{io.netty.util.concurrent.FastThreadLocalThread}}. In the thread dump we see
> lot of repair threads:
> {noformat}
> grep "Repair#" threaddump.txt | wc -l
> 50 {noformat}
>
> The repair jobs are waiting for the validation to finish:
> {noformat}
> "Repair#152:1" #96170 daemon prio=5 os_prio=0 tid=0x0000000012fc5000
> nid=0x542a waiting on condition [0x00007f81ee414000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000007939bcfc8> (a
> com.google.common.util.concurrent.AbstractFuture$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at
> com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:285)
> at
> com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:116)
> at
> com.google.common.util.concurrent.Uninterruptibles.getUninterruptibly(Uninterruptibles.java:137)
> at
> com.google.common.util.concurrent.Futures.getUnchecked(Futures.java:1509)
> at org.apache.cassandra.repair.RepairJob.run(RepairJob.java:160)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at
> org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:81)
> at
> org.apache.cassandra.concurrent.NamedThreadFactory$$Lambda$13/480490520.run(Unknown
> Source)
> at java.lang.Thread.run(Thread.java:748) {noformat}
>
> Thats the line where the threads stuck:
> {noformat}
> // Wait for validation to complete
> Futures.getUnchecked(validations); {noformat}
>
> The call to {{StorageServiceMBean.forceTerminateAllRepairSessions()}} stops
> the thread pool executor. It looks like that futures which are in progress
> will therefor never be completed and the repair thread waits forever and
> won't be finished.
>
> Environment:
> Cassandra version: 3.11.4
> Cassandra Reaper: 1.4.0
> Java Runtime:
> {noformat}
> openjdk version "1.8.0_212"
> OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_212-b03)
> OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.212-b03, mixed mode)
> {noformat}
>
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