[jira] [Created] (IGNITE-13960) Starvation in mgmt pool caused by MetadataTask execution

[Anton Vinogradov (Jira)]

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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