J'ai écrit un travail mapreduce pour analyser une table hbase pendant un certain laps de temps afin de compter certains éléments dont nous avons besoin pour l'analyse.Comment déboguer l'échec du travail de mappage après plusieurs tentatives
Les mappeurs dans le travail MR continue d'échouer mais je ne sais pas pourquoi. Il semble que chaque fois que je lance le travail, un nombre différent de mappeurs échouent. Le journal de YARN (voir ci-dessous) du gestionnaire de Cloudera n'est pas utile pour indiquer quel est le problème, bien que quelqu'un ait dit que je pourrais manquer de mémoire.
Il semble réessayer plusieurs fois, mais chaque fois il échoue. Que dois-je faire pour que ça cesse d'échouer ou comment puis-je enregistrer des choses pour m'aider à mieux déterminer ce qui se passe?
Voici un journal de YARN pour l'un des mappeurs ayant échoué.
Error: org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after attempts=36, exceptions: Thu Jun 15 16:26:57 PDT 2017, null, java.net.SocketTimeoutException: callTimeout=60000, callDuration=60301: row '152_p3401.db161139.sjc102.dbi_1496271480' on table 'dbi_based_data' at region=dbi_based_data,151_p3413.db162024.iad4.dbi_1476974340,1486675565213.d83250d0682e648d165872afe5abd60e., hostname=hslave35118.ams9.mysecretdomain.com,60020,1483570489305, seqNum=19308931 at org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.throwEnrichedException(RpcRetryingCallerWithReadReplicas.java:276) at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:207) at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:60) at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200) at org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:320) at org.apache.hadoop.hbase.client.ClientScanner.loadCache(ClientScanner.java:403) at org.apache.hadoop.hbase.client.ClientScanner.next(ClientScanner.java:364) at org.apache.hadoop.hbase.mapreduce.TableRecordReaderImpl.nextKeyValue(TableRecordReaderImpl.java:236) at org.apache.hadoop.hbase.mapreduce.TableRecordReader.nextKeyValue(TableRecordReader.java:147) at org.apache.hadoop.hbase.mapreduce.TableInputFormatBase$1.nextKeyValue(TableInputFormatBase.java:216) at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:556) at org.apache.hadoop.mapreduce.task.MapContextImpl.nextKeyValue(MapContextImpl.java:80) at org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.nextKeyValue(WrappedMapper.java:91) at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1693) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158) Caused by: java.net.SocketTimeoutException: callTimeout=60000, callDuration=60301: row '152_p3401.db161139.sjc102.dbi_1496271480' on table 'dbi_based_data' at region=dbi_based_data,151_p3413.db162024.iad4.dbi_1476974340,1486675565213.d83250d0682e648d165872afe5abd60e., hostname=hslave35118.ams9.mysecretdomain.com,60020,1483570489305, seqNum=19308931 at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:159) at org.apache.hadoop.hbase.client.ResultBoundedCompletionService$QueueingFuture.run(ResultBoundedCompletionService.java:65) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.io.IOException: Call to hslave35118.ams9.mysecretdomain.com/10.216.35.118:60020 failed on local exception: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call id=12, waitTime=60001, operationTimeout=60000 expired. at org.apache.hadoop.hbase.ipc.AbstractRpcClient.wrapException(AbstractRpcClient.java:291) at org.apache.hadoop.hbase.ipc.RpcClientImpl.call(RpcClientImpl.java:1272) at org.apache.hadoop.hbase.ipc.AbstractRpcClient.callBlockingMethod(AbstractRpcClient.java:226) at org.apache.hadoop.hbase.ipc.AbstractRpcClient$BlockingRpcChannelImplementation.callBlockingMethod(AbstractRpcClient.java:331) at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$BlockingStub.scan(ClientProtos.java:34094) at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:219) at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:64) at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200) at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(ScannerCallableWithReplicas.java:360) at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(ScannerCallableWithReplicas.java:334) at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:126) ... 4 more Caused by: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call id=12, waitTime=60001, operationTimeout=60000 expired. at org.apache.hadoop.hbase.ipc.Call.checkAndSetTimeout(Call.java:73) at org.apache.hadoop.hbase.ipc.RpcClientImpl.call(RpcClientImpl.java:1246) ... 13 more