Details
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Sub-task
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Status: Resolved
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Major
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Resolution: Fixed
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None
Description
Pauses in all Map threads but one are observed in the beginning . This is caused by waiting on future.get() in HadoopV2Job.getTaskContext(HadoopTaskInfo) .
at sun.misc.Unsafe.park(boolean, long) at java.util.concurrent.locks.LockSupport.park(Object) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt() at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(int) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(int) at org.apache.ignite.internal.util.future.GridFutureAdapter.get0(boolean) at org.apache.ignite.internal.util.future.GridFutureAdapter.get() at org.apache.ignite.internal.processors.hadoop.impl.v2.HadoopV2Job.getTaskContext(HadoopTaskInfo) at org.apache.ignite.internal.processors.hadoop.shuffle.HadoopShuffleJob.<init>(Object, IgniteLogger, HadoopJob, GridUnsafeMemory, int, int[], int) at org.apache.ignite.internal.processors.hadoop.shuffle.HadoopShuffle.newJob(HadoopJobId) at org.apache.ignite.internal.processors.hadoop.shuffle.HadoopShuffle.job(HadoopJobId) at org.apache.ignite.internal.processors.hadoop.shuffle.HadoopShuffle.output(HadoopTaskContext) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopEmbeddedTaskExecutor$1.createOutput(HadoopTaskContext) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.createOutputInternal(HadoopTaskContext) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.runTask(HadoopPerformanceCounter) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.call0() at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask$1.call() at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask$1.call() at org.apache.ignite.internal.processors.hadoop.impl.v2.HadoopV2TaskContext.runAsJobOwner(Callable) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.call() at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.call() at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopExecutorService$2.body() at org.apache.ignite.internal.util.worker.GridWorker.run() at java.lang.Thread.run()
while the working thread initializes the context:
Java Monitor Wait at java.lang.Object.wait(long) at java.lang.Thread.join(long) at java.lang.Thread.join() at org.apache.hadoop.util.Shell.joinThread(Thread) at org.apache.hadoop.util.Shell.runCommand() at org.apache.hadoop.util.Shell.run() at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute() at org.apache.hadoop.util.Shell.isSetsidSupported() at org.apache.hadoop.util.Shell.<clinit>() at org.apache.hadoop.util.StringUtils.<clinit>() at org.apache.hadoop.security.SecurityUtil.getAuthenticationMethod(Configuration) at org.apache.hadoop.security.UserGroupInformation.initialize(Configuration, boolean) at org.apache.hadoop.security.UserGroupInformation.ensureInitialized() at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(Subject) at org.apache.hadoop.security.UserGroupInformation.getLoginUser() at org.apache.hadoop.security.UserGroupInformation.getCurrentUser() at org.apache.hadoop.mapreduce.task.JobContextImpl.<init>(Configuration, JobID) at org.apache.hadoop.mapred.JobContextImpl.<init>(JobConf, JobID, Progressable) at org.apache.hadoop.mapred.JobContextImpl.<init>(JobConf, JobID) at org.apache.ignite.internal.processors.hadoop.impl.v2.HadoopV2TaskContext.<init>(HadoopTaskInfo, HadoopJob, HadoopJobId, UUID, DataInput) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Constructor, Object[]) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Object[]) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Object[]) at java.lang.reflect.Constructor.newInstance(Object[]) at org.apache.ignite.internal.processors.hadoop.impl.v2.HadoopV2Job.getTaskContext(HadoopTaskInfo) at org.apache.ignite.internal.processors.hadoop.shuffle.HadoopShuffleJob.<init>(Object, IgniteLogger, HadoopJob, GridUnsafeMemory, int, int[], int) at org.apache.ignite.internal.processors.hadoop.shuffle.HadoopShuffle.newJob(HadoopJobId) at org.apache.ignite.internal.processors.hadoop.shuffle.HadoopShuffle.job(HadoopJobId) at org.apache.ignite.internal.processors.hadoop.shuffle.HadoopShuffle.output(HadoopTaskContext) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopEmbeddedTaskExecutor$1.createOutput(HadoopTaskContext) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.createOutputInternal(HadoopTaskContext) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.runTask(HadoopPerformanceCounter) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.call0() at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask$1.call() at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask$1.call() at org.apache.ignite.internal.processors.hadoop.impl.v2.HadoopV2TaskContext.runAsJobOwner(Callable) at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.call() at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopRunnableTask.call() at org.apache.ignite.internal.processors.hadoop.taskexecutor.HadoopExecutorService$2.body() at org.apache.ignite.internal.util.worker.GridWorker.run() at java.lang.Thread.run()
Experimental solution can be found in branch "ignite-4270-sync-direct-gzip-avoid-setup-pauses". 2 changes are made there:
1) HadoopShuffle.job() avoided "speculative execution"
2) task contexts creation paralleled in HadoopShuffleJob.<init>().
JFR profiles show that there are no pauses any more, however, there is stil a lot of work done in each thread loading classes, parsing XML configs, and initializing Hadoop statics (in case of UserGroupInformation.getCurrentUser() this even involves a shell script execution).
