Hello, On our data node, we are increasing getting alerts related to Data Node Pause Duration. So far, this is happening on a single data node out of nine data nodes. Following is the error captured from DN logs  2020-10-27 16:20:05,140 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected pause in JVM or host machine (eg GC): pause of approximately 1821ms GC pool 'ParNew' had collection(s): count=1 time=2075ms)   Current Java Heap Size of Data Node in Bytes is at 6GB   CM / CDH – 5.16.x   Any help is appreciated.   Regards Amn ... View more

Hello, How to update DNS part in host name, example from 192.168.0.1.test-1.pl to 192.168.0.1.test.co.pl so that we can open CM GUI via 192.168.0.1.test.co.pl:7180 and other web gui (hue, impala etc) with the new dns name test.co.pl.     Regards Anm ... View more

Hello, I need to reboot my Data node to fix an underlying network issue. OS team needs around 3 hours (approx.) to complete this activity, what would be the best approach: Decommission and recommission host / dn. Move DN to Offline Mode (feature in CM 5.16.x) Any help / guidance is appreciated.   Regards Amn ... View more

Hello All,   We are running Spark jobs via yarn and its failing with the below error, any help / pointer to fix is much appericated.   Shell output: main : command provided 1 main : run as user is TEST1 main : requested yarn user is TEST1 Writing to tmp file /data/8/yarn/nm/nmPrivate/application_1587389136999_0013/container_e56_1587389136999_0013_01_000477/container_e56_1587389136999_0013_01_000477.pid.tmp Writing to cgroup task files... Container exited with a non-zero exit code 1 org.apache.spark.rpc.RpcTimeoutException: Cannot receive any reply in 120 seconds. This timeout is controlled by spark.rpc.askTimeout at org.apache.spark.rpc.RpcTimeout.org$apache$spark$rpc$RpcTimeout$$createRpcTimeoutException(RpcTimeout.scala:48) at org.apache.spark.rpc.RpcTimeout$$anonfun$addMessageIfTimeout$1.applyOrElse(RpcTimeout.scala:63) at org.apache.spark.rpc.RpcTimeout$$anonfun$addMessageIfTimeout$1.applyOrElse(RpcTimeout.scala:59) at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36) at scala.util.Failure$$anonfun$recover$1.apply(Try.scala:216) at scala.util.Try$.apply(Try.scala:192) at scala.util.Failure.recover(Try.scala:216) at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:326) at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:326) at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) at org.spark_project.guava.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293) at scala.concurrent.impl.ExecutionContextImpl$$anon$1.execute(ExecutionContextImpl.scala:136) at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40) at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248) at scala.concurrent.Promise$class.complete(Promise.scala:55) at scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:153) at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:237) at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:237) at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) at scala.concurrent.BatchingExecutor$Batch$$anonfun$run$1.processBatch$1(BatchingExecutor.scala:63) at scala.concurrent.BatchingExecutor$Batch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:78) at scala.concurrent.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:55) at scala.concurrent.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:55) at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72) at scala.concurrent.BatchingExecutor$Batch.run(BatchingExecutor.scala:54) at scala.concurrent.Future$InternalCallbackExecutor$.unbatchedExecute(Future.scala:601) at scala.concurrent.BatchingExecutor$class.execute(BatchingExecutor.scala:106) at scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:599) at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40) at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248) at scala.concurrent.Promise$class.tryFailure(Promise.scala:112) at scala.concurrent.impl.Promise$DefaultPromise.tryFailure(Promise.scala:153) at org.apache.spark.rpc.netty.NettyRpcEnv.org$apache$spark$rpc$netty$NettyRpcEnv$$onFailure$1(NettyRpcEnv.scala:205) at org.apache.spark.rpc.netty.NettyRpcEnv$$anon$1.run(NettyRpcEnv.scala:239) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) 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) Caused by: java.util.concurrent.TimeoutException: Cannot receive any reply in 120 seconds ... 8 more   Regards Amn ... View more

Hi, We are repeatedly getting alerts for NN Pause duration (The health test result for NAME_NODE_PAUSE_DURATION has become bad: Average time spent paused was 44.5 second(s) (74.25%) per minute over the previous 5 minute(s). Critical threshold: 60.00%.)  CM / CDH - 5.16.2 Current NN Heap Size - 4GB Block Used - 5TB   Request some assistance in fixing this.   Thanks  Amn       ... View more