Tengo la siguiente situaciónHadoop: trabajo se ejecuta bien en conjunto más pequeño de datos, pero falla con gran conjunto de datos
tengo 3 máquinas se agrupan con los siguientes confirguration.
Master
Usage of /: 91.4% of 74.41GB
MemTotal: 16557308 kB
MemFree: 723736 kB
Slave 01
Usage of /: 52.9% of 29.76GB
MemTotal: 16466220 kB
MemFree: 5320860 kB
Slave 02
Usage of /: 19.0% of 19.84GB
MemTotal: 16466220 kB
MemFree: 6173564 kB
hadoop/conf/núcleo-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/work/app/hadoop/tmp</value>
<description>A base for other temporary directories.</description>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://master:54310</value>
<description>The name of the default file system. A URI whose
scheme and authority determine the FileSystem implementation. The
uri's scheme determines the config property (fs.SCHEME.impl) naming
the FileSystem implementation class. The uri's authority is used to
determine the host, port, etc. for a filesystem.</description>
</property>
<property>
<name>dfs.datanode.max.xcievers</name>
<value>4096</value>
</property>
</configuration>
hadoop/conf/mapred-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>master:54311</value>
<description>The host and port that the MapReduce job tracker runs
at. If "local", then jobs are run in-process as a single map
and reduce task.
</description>
</property>
<property>
<name>mapred.reduce.tasks</name>
<value>1</value>
</property>
<property>
<name>mapred.map.tasks</name>
<value>100</value>
</property>
<property>
<name>mapred.task.timeout</name>
<value>0</value>
</property>
<property>
<name>mapred.child.java.opts</name>
<value>-Xmx512m</value>
</property>
</configuration>
hadoop/conf/hdfs-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>dfs.replication</name>
<value>3</value>
<description>Default block replication.
The actual number of replications can be specified when the file is created.
The default is used if replication is not specified in create time.
</description>
</property>
<property>
<name>dfs.datanode.socket.write.timeout</name>
<value>0</value>
</property>
</configuration>
- tengo más de 2 millones de documentos XML (cada tamaño del documento ~ 400 KB)
map
tareas abre cada uno de estos XMLs y emiten comoJSON
reduce
tarea se hace cada uno de estosJSON
como cadena, se aplica la transformación y la emite- no. de
map
tareas - 100 - no. de
reduce
tareas - 01 - Todo el trabajo se ejecuta bien cuando
number of documents = 10,000
- cuando
number of documents = 278262
, el trabajo falla y veo varios problemas de la siguiente manera
En WebUI
en el esclavo-01 , slave-02
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Task process exit with nonzero status of 255.
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:258)
El maestro
java.lang.RuntimeException: java.io.IOException: Spill failed
at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:325)
at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:132)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:436)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)
at org.apache.hadoop.mapred.Child$4.run(Child.java:261)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
at org.apache.hadoop.mapred.Child.main(Child.java:255)
Caused by: java.io.IOException: Spill failed
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:1029)
at org.apache.hadoop.mapred.MapTask$OldOutputCollector.collect(MapTask.java:592)
at org.apache.hadoop.streaming.PipeMapRed$MROutputThread.run(PipeMapRed.java:381)
Caused by: org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find any valid local directory for output/spill1.out
at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:381)
at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:146)
at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:127)
at org.apache.hadoop.mapred.MapOutputFile.getSpillFileForWrite(MapOutputFile.java:121)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1392)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.access$1800(MapTask.java:853)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer$SpillThread.run(MapTask.java:1344)
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Creation of /work/app/hadoop/tmp/mapred/local/userlogs/job_201207220051_0001/attempt_201207220051_0001_m_000004_2 failed.
at org.apache.hadoop.mapred.TaskLog.createTaskAttemptLogDir(TaskLog.java:102)
at org.apache.hadoop.mapred.DefaultTaskController.createLogDir(DefaultTaskController.java:71)
at org.apache.hadoop.mapred.TaskRunner.prepareLogFiles(TaskRunner.java:316)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:228)
-------
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Creation of /work/app/hadoop/tmp/mapred/local/userlogs/job_201207220051_0001/attempt_201207220051_0001_m_000004_2.cleanup failed.
at org.apache.hadoop.mapred.TaskLog.createTaskAttemptLogDir(TaskLog.java:102)
at org.apache.hadoop.mapred.DefaultTaskController.createLogDir(DefaultTaskController.java:71)
at org.apache.hadoop.mapred.TaskRunner.prepareLogFiles(TaskRunner.java:316)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:228)
Cuando voy y comprobar los registros en slaves
, esto es lo que encontré en hadoop-hduser-datanode-hadoop-01.log
2012-07-22 09:26:52,795 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Receiving block blk_-5384386931827098009_1010 src: /10.0.0.81:51402 dest: /10.0.0.82:50010
2012-07-22 09:26:52,800 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: IOException in BlockReceiver constructor. Cause is
2012-07-22 09:26:52,800 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: writeBlock blk_-5384386931827098009_1010 received exception java.io.IOException: Unexpected problem in creating temporary file for blk_-5384386931827098009_1010. File /work/app/hadoop/tmp/dfs/data/tmp/blk_-5384386931827098009 should not be present, but is.
2012-07-22 09:26:52,800 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(10.0.0.82:50010, storageID=DS-735951984-127.0.1.1-50010-1342943517618, infoPort=50075, ipcPort=50020):DataXceiver
java.io.IOException: Unexpected problem in creating temporary file for blk_-5384386931827098009_1010. File /work/app/hadoop/tmp/dfs/data/tmp/blk_-5384386931827098009 should not be present, but is.
at org.apache.hadoop.hdfs.server.datanode.FSDataset$FSVolume.createTmpFile(FSDataset.java:426)
at org.apache.hadoop.hdfs.server.datanode.FSDataset$FSVolume.createTmpFile(FSDataset.java:404)
at org.apache.hadoop.hdfs.server.datanode.FSDataset.createTmpFile(FSDataset.java:1249)
at org.apache.hadoop.hdfs.server.datanode.FSDataset.writeToBlock(FSDataset.java:1138)
at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:99)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:299)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:107)
at java.lang.Thread.run(Thread.java:662)
Por favor, me ayudan a entender lo que es que yo Qué hacer para resolver este problema?
Veo que nunca encontró una respuesta. ¿Intentó combinar sus registros con menos archivos grandes? –