Pavel Vinokurov created IGNITE-13960:
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Summary: Starvation in mgmt pool caused by MetadataTask execution
Key: IGNITE-13960
URL: https://issues.apache.org/jira/browse/IGNITE-13960
Project: Ignite
Issue Type: Bug
Components: compute
Affects Versions: 2.9.1
Reporter: Pavel Vinokurov
Assignee: Pavel Vinokurov
*Issue:*
Requesting cache metadata from multiple threads causes starvation in the mgmt
pool.
*Root Cause:*
>From the mgmt pool GridCacheCommandHandler.MetadataJob calls
>GridCacheQueryManager#sqlMetadata() and
>GridClosureProcessor#callAsyncNoFailover().get() that executes and waits an
>another internal task. The job response of this task should be also handled
>from the mgmt pool. It causes starvation.
*Proposed Fix:*
Make GridCacheQueryManager#sqlMetadata() asynchronous and apply continuation
for GridCacheCommandHandler.MetadataJob to release a mgmt thread for the time
of completing the future returned by sqlMetadata().
Attached threads with hanging threads:
{code:java}
"mgmt-#10633" #14311 prio=5 os_prio=0 tid=0x0000560c79117000 nid=0x134c6
waiting on condition [0x00007f15baa77000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:304)
at
org.apache.ignite.internal.util.future.GridFutureAdapter.get0(GridFutureAdapter.java:177)
at
org.apache.ignite.internal.util.future.GridFutureAdapter.get(GridFutureAdapter.java:140)
at
org.apache.ignite.internal.processors.cache.query.GridCacheQueryManager.sqlMetadata(GridCacheQueryManager.java:1803)
at
org.apache.ignite.internal.processors.rest.handlers.cache.GridCacheCommandHandler$MetadataJob.execute(GridCacheCommandHandler.java:1123)
at
org.apache.ignite.internal.processors.rest.handlers.cache.GridCacheCommandHandler$MetadataJob.execute(GridCacheCommandHandler.java:1088)
at
org.apache.ignite.internal.processors.job.GridJobWorker$2.call(GridJobWorker.java:567)
at
org.apache.ignite.internal.util.IgniteUtils.wrapThreadLoader(IgniteUtils.java:7069)
at
org.apache.ignite.internal.processors.job.GridJobWorker.execute0(GridJobWorker.java:561)
at
org.apache.ignite.internal.processors.job.GridJobWorker.body(GridJobWorker.java:490)
at
org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:119)
at
org.apache.ignite.internal.processors.job.GridJobProcessor.processJobExecuteRequest(GridJobProcessor.java:1270)
at
org.apache.ignite.internal.processors.job.GridJobProcessor$JobExecutionListener.onMessage(GridJobProcessor.java:2088)
at
org.apache.ignite.internal.managers.communication.GridIoManager.invokeListener(GridIoManager.java:1635)
at
org.apache.ignite.internal.managers.communication.GridIoManager.processRegularMessage0(GridIoManager.java:1255)
at
org.apache.ignite.internal.managers.communication.GridIoManager.access$4300(GridIoManager.java:144)
at
org.apache.ignite.internal.managers.communication.GridIoManager$8.execute(GridIoManager.java:1144)
at
org.apache.ignite.internal.managers.communication.TraceRunnable.run(TraceRunnable.java:50)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"mgmt-#81" #270 prio=5 os_prio=0 tid=0x0000562323c3c800 nid=0x592 waiting on
condition [0x00007fba5f378000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:304)
at
org.apache.ignite.internal.util.future.GridFutureAdapter.get0(GridFutureAdapter.java:177)
at
org.apache.ignite.internal.util.future.GridFutureAdapter.get(GridFutureAdapter.java:140)
at
org.apache.ignite.internal.processors.cluster.GridClusterStateProcessor$ClientChangeGlobalStateComputeRequest.run(GridClusterStateProcessor.java:1979)
at
org.apache.ignite.internal.processors.closure.GridClosureProcessor$C4.execute(GridClosureProcessor.java:1943)
at
org.apache.ignite.internal.processors.job.GridJobWorker$2.call(GridJobWorker.java:567)
at
org.apache.ignite.internal.util.IgniteUtils.wrapThreadLoader(IgniteUtils.java:7069)
at
org.apache.ignite.internal.processors.job.GridJobWorker.execute0(GridJobWorker.java:561)
at
org.apache.ignite.internal.processors.job.GridJobWorker.body(GridJobWorker.java:490)
at
org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:119)
at
org.apache.ignite.internal.processors.job.GridJobProcessor.processJobExecuteRequest(GridJobProcessor.java:1270)
at
org.apache.ignite.internal.processors.job.GridJobProcessor$JobExecutionListener.onMessage(GridJobProcessor.java:2088)
at
org.apache.ignite.internal.managers.communication.GridIoManager.invokeListener(GridIoManager.java:1635)
at
org.apache.ignite.internal.managers.communication.GridIoManager.processRegularMessage0(GridIoManager.java:1255)
at
org.apache.ignite.internal.managers.communication.GridIoManager.access$4300(GridIoManager.java:144)
at
org.apache.ignite.internal.managers.communication.GridIoManager$8.execute(GridIoManager.java:1144)
at
org.apache.ignite.internal.managers.communication.TraceRunnable.run(TraceRunnable.java:50)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
{code}
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