Details
Major Description
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:
"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)
