Hadoop의 yarn-client와 연결 시에 아래와 같은 에러 발생한다면

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18/02/01 11:21:43 ERROR client.TransportClient: Failed to send RPC 8239418781252696800 to datanode-c/192.168.10.29:41292: java.nio.channels.ClosedChannelException
java.nio.channels.ClosedChannelException
 
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Java 8의 과도한 메모리 할당 문제로 인해서 yarn 클러스터 연관성이 있을 수 있습니다.



따라서 hadoop의 홈 디렉터리 이하에 /etc/hadoop 에서 yarn-site.xml 설정 파일을 적절히 수정할 필요가 있습니다.

 : yarn-site.xml 편집

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$ vi /usr/local/hadoop/etc/hadoop/yarn-site.xml
 
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 : 수정 후 저장 및 종료

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<configuration>
 
...
 
<property>
        <name>yarn.nodemanager.pmem-check-enabled</name>
        <value>false</value>
</property>
<property>
        <name>yarn.nodemanager.vmem-check-enabled</name>
        <value>false</value>
</property>
</configuration>
 
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* yarn.nodemanager.pmem-check-enabled: 물리적 메모리 제한이 컨테이너에 적용되는지 여부

* yarn.nodemanager.vmem-check-enabled: 가상 메모리 제한이 컨테이너에 적용되는지 여부


아래의 증상도 동일한 이유에서 발생되는 에러가 아닐까 생각됩니다.

 : 증상 1

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18/02/01 11:21:43 ERROR cluster.YarnScheduler: Lost executor 2 on datanode-b: Slave lost
 
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 : 증상 2

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18/02/01 11:21:43 ERROR client.TransportClient: Failed to send RPC 6587330219710502294 to datanode-c/192.168.10.29:41292: java.nio.channels.ClosedChannelException
java.nio.channels.ClosedChannelException
 
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 : 증상 3

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18/02/01 11:21:43 ERROR cluster.YarnScheduler: Lost executor 1 on datanode-c: Slave lost
 
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출처: https://stackoverflow.com/questions/39467761/how-to-know-what-is-the-reason-for-closedchannelexceptions-with-spark-shell-in-y



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[에러] java.lang.IllegalArgumentException: Required executor memory (8192+819 MB) is above the max threshold (8192 MB) of this cluster! Please check the values of 'yarn.scheduler.maximum-allocation-mb' and/or 'yarn.nodemanager.resource.memory-mb'.  (0) 2018.02.01


Hadoop의 yarn-client와 연결 시에 아래와 같은 에러 발생한다면

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18/02/01 10:26:54 INFO remote.RemoteActorRefProvider$RemotingTerminator: Remoting shut down.
java.lang.IllegalArgumentException: Required executor memory (8192+819 MB) is above the max threshold (8192 MB) of this cluster! Please check the values of 'yarn.scheduler.maximum-allocation-mb' and/or 'yarn.nodemanager.resource.memory-mb'.
        at org.apache.spark.deploy.yarn.Client.verifyClusterResources(Client.scala:283)
        at org.apache.spark.deploy.yarn.Client.submitApplication(Client.scala:139)
        at org.apache.spark.scheduler.cluster.YarnClientSchedulerBackend.start(YarnClientSchedulerBackend.scala:57)
        at org.apache.spark.scheduler.TaskSchedulerImpl.start(TaskSchedulerImpl.scala:144)
        at org.apache.spark.SparkContext.<init>(SparkContext.scala:530)
        at org.apache.spark.repl.SparkILoop.createSparkContext(SparkILoop.scala:1017)
        at $iwC$$iwC.<init>(<console>:15)
        at $iwC.<init>(<console>:24)
        at <init>(<console>:26)
        at .<init>(<console>:30)
        at .<clinit>(<console>)
        at .<init>(<console>:7)
        at .<clinit>(<console>)
        at $print(<console>)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
        at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1346)
        at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
        at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
        at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
        at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:857)
        at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:902)
        at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:814)
        at org.apache.spark.repl.SparkILoopInit$$anonfun$initializeSpark$1.apply(SparkILoopInit.scala:125)
        at org.apache.spark.repl.SparkILoopInit$$anonfun$initializeSpark$1.apply(SparkILoopInit.scala:124)
        at org.apache.spark.repl.SparkIMain.beQuietDuring(SparkIMain.scala:324)
        at org.apache.spark.repl.SparkILoopInit$class.initializeSpark(SparkILoopInit.scala:124)
        at org.apache.spark.repl.SparkILoop.initializeSpark(SparkILoop.scala:64)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1$$anonfun$apply$mcZ$sp$5.apply$mcV$sp(SparkILoop.scala:974)
        at org.apache.spark.repl.SparkILoopInit$class.runThunks(SparkILoopInit.scala:159)
        at org.apache.spark.repl.SparkILoop.runThunks(SparkILoop.scala:64)
        at org.apache.spark.repl.SparkILoopInit$class.postInitialization(SparkILoopInit.scala:108)
        at org.apache.spark.repl.SparkILoop.postInitialization(SparkILoop.scala:64)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:991)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
        at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
        at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:945)
        at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1059)
        at org.apache.spark.repl.Main$.main(Main.scala:31)
        at org.apache.spark.repl.Main.main(Main.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731)
        at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)
        at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)
        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)
        at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
 
java.lang.NullPointerException
        at org.apache.spark.sql.SQLContext$.createListenerAndUI(SQLContext.scala:1367)
        at org.apache.spark.sql.hive.HiveContext.<init>(HiveContext.scala:101)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at org.apache.spark.repl.SparkILoop.createSQLContext(SparkILoop.scala:1028)
        at $iwC$$iwC.<init>(<console>:15)
        at $iwC.<init>(<console>:24)
        at <init>(<console>:26)
        at .<init>(<console>:30)
        at .<clinit>(<console>)
        at .<init>(<console>:7)
        at .<clinit>(<console>)
        at $print(<console>)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
        at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1346)
        at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
        at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
        at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
        at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:857)
        at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:902)
        at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:814)
        at org.apache.spark.repl.SparkILoopInit$$anonfun$initializeSpark$1.apply(SparkILoopInit.scala:132)
        at org.apache.spark.repl.SparkILoopInit$$anonfun$initializeSpark$1.apply(SparkILoopInit.scala:124)
        at org.apache.spark.repl.SparkIMain.beQuietDuring(SparkIMain.scala:324)
        at org.apache.spark.repl.SparkILoopInit$class.initializeSpark(SparkILoopInit.scala:124)
        at org.apache.spark.repl.SparkILoop.initializeSpark(SparkILoop.scala:64)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1$$anonfun$apply$mcZ$sp$5.apply$mcV$sp(SparkILoop.scala:974)
        at org.apache.spark.repl.SparkILoopInit$class.runThunks(SparkILoopInit.scala:159)
        at org.apache.spark.repl.SparkILoop.runThunks(SparkILoop.scala:64)
        at org.apache.spark.repl.SparkILoopInit$class.postInitialization(SparkILoopInit.scala:108)
        at org.apache.spark.repl.SparkILoop.postInitialization(SparkILoop.scala:64)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:991)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
        at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
        at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:945)
        at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1059)
        at org.apache.spark.repl.Main$.main(Main.scala:31)
        at org.apache.spark.repl.Main.main(Main.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731)
        at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)
        at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)
        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)
        at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
 
<console>:16: error: not found: value sqlContext
         import sqlContext.implicits._
                ^
<console>:16: error: not found: value sqlContext
         import sqlContext.sql
                ^
 
cs



hadoop 홈 디렉터리 이하에 /etc/hadoop 디렉터리에 있는 mapred-site.xml 및 mapred-site.xml 파일의 설정값을 적절히 조정할 필요가 있습니다.

 : yarn-site.xml 편집

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$ vi /usr/local/hadoop/etc/hadoop/yarn-site.xml
 
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 : 수정 후 저장 및 종료

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<configuration>
 
...
 
<property>
        <name>yarn.nodemanager.resource.memory-mb</name>
        <value>10240</value>
</property>
<property>
        <name>yarn.scheduler.maximum-allocation-mb</name>
        <value>12288</value>
</property>
</configuration>
 
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이하는 필요에 따라서 적절히 설정

 : mapred-site.xml 편집

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$ vi /usr/local/hadoop/etc/hadoop/mapred-site.xml
 
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 : 수정 후 저장 및 종료

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<configuration>
 
...
 
<property>
        <name>mapreduce.reduce.memory.mb</name>
        <value>8192</value>
</property>
<property>
        <name>mapreduce.reduce.java.opts</name>
        <value>-Xmx4096m</value>
</property>
</configuration>
 
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[에러] client.TransportClient: Failed to send RPC 8239418781252696800 to datanode-c/192.168.10.29:41292: java.nio.channels.ClosedChannelException java.nio.channels.ClosedChannelException  (0) 2018.02.01

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