Critical Description
For every allocate request locking can be avoided. Improving performance
"pool-6-thread-300" #624 prio=5 os_prio=0 tid=0x00007f2f91152800 nid=0x8ec5 waiting for monitor entry [0x00007f1ec6a8d000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2841) - waiting to lock <0x00007f1f8107c748> (a org.apache.hadoop.yarn.conf.YarnConfiguration) at org.apache.hadoop.conf.Configuration.get(Configuration.java:1214) at org.apache.hadoop.conf.Configuration.getTrimmed(Configuration.java:1268) at org.apache.hadoop.conf.Configuration.getBoolean(Configuration.java:1674) at org.apache.hadoop.yarn.conf.YarnConfiguration.areNodeLabelsEnabled(YarnConfiguration.java:3646) at org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerUtils.normalizeAndValidateRequest(SchedulerUtils.java:234) at org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerUtils.normalizeAndvalidateRequest(SchedulerUtils.java:274) at org.apache.hadoop.yarn.server.resourcemanager.RMServerUtils.normalizeAndValidateRequests(RMServerUtils.java:261) at org.apache.hadoop.yarn.server.resourcemanager.DefaultAMSProcessor.allocate(DefaultAMSProcessor.java:242) at org.apache.hadoop.yarn.server.resourcemanager.scheduler.constraint.processor.DisabledPlacementProcessor.allocate(DisabledPlacementProcessor.java:75) at org.apache.hadoop.yarn.server.resourcemanager.AMSProcessingChain.allocate(AMSProcessingChain.java:92) at org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(ApplicationMasterService.java:427) - locked <0x00007f24dd3f9e40> (a org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService$AllocateResponseLock) at org.apache.hadoop.yarn.sls.appmaster.MRAMSimulator$1.run(MRAMSimulator.java:352) at org.apache.hadoop.yarn.sls.appmaster.MRAMSimulator$1.run(MRAMSimulator.java:349) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1729) at org.apache.hadoop.yarn.sls.appmaster.MRAMSimulator.sendContainerRequest(MRAMSimulator.java:348) at org.apache.hadoop.yarn.sls.appmaster.AMSimulator.middleStep(AMSimulator.java:212) at org.apache.hadoop.yarn.sls.scheduler.TaskRunner$Task.run(TaskRunner.java:94) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)