We are trying to run a Oozie workflow with 3 sub workflows running in parallel using fork. The sub-workflows contains a node running a native map reduce job, and subsequent two nodes running some complex PIG jobs. Finally the three sub-workflows are joined to a single end node.
When we run this workflow, we get LeaseExpiredException. The exception occurs randomly while running the PIG jobs. There is no definite place when it occurs, but it occurs every time we run the WF.
Also, if we remove the fork and run the sub-workflows sequentially, it works fine. However, our expectation is to have them run in parallel and same on some execution time.
Can you please help me understand this issue and some pointers on where we could be going wrong. We are starting with hadoop development and haven't faced such an issue earlier.
It looks like due to several tasks running in parallel, one of the threads closed a part file and when another thread tried to close the same, it throws the error.
Following is the stack trace of the exception from the hadoop logs.
2013-02-19 10:23:54,815 INFO org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher: 57% complete
2013-02-19 10:26:55,361 INFO org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher: 59% complete
2013-02-19 10:27:59,666 ERROR org.apache.hadoop.hdfs.DFSClient: Exception closing file <hdfspath>/oozie-oozi/0000105-130218000850190-oozie-oozi-W/aggregateData--pig/output/_temporary/_attempt_201302180007_0380_m_000000_0/part-00000 : org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease on <hdfspath>/oozie-oozi/0000105-130218000850190-oozie-oozi-W/aggregateData--pig/output/_temporary/_attempt_201302180007_0380_m_000000_0/part-00000 File does not exist. Holder DFSClient_attempt_201302180007_0380_m_000000_0 does not have any open files.
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1664)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1655)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.completeFileInternal(FSNamesystem.java:1710)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.completeFile(FSNamesystem.java:1698)
at org.apache.hadoop.hdfs.server.namenode.NameNode.complete(NameNode.java:793)
at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1439)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1435)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1433)
Following is the sample for main workflow and one sub-workflow.
Main Work-Flow:
<workflow-app xmlns="uri:oozie:workflow:0.2" name="MainProcess">
<start to="forkProcessMain"/>
<fork name="forkProcessMain">
<path start="Proc1"/>
<path start="Proc2"/>
<path start="Proc3"/>
</fork>
<join name="joinProcessMain" to="end"/>
<action name="Proc1">
<sub-workflow>
<app-path>${nameNode}${wfPath}/proc1_workflow.xml</app-path>
<propagate-configuration/>
</sub-workflow>
<ok to="joinProcessMain"/>
<error to="fail"/>
</action>
<action name="Proc2">
<sub-workflow>
<app-path>${nameNode}${wfPath}/proc2_workflow.xml</app-path>
<propagate-configuration/>
</sub-workflow>
<ok to="joinProcessMain"/>
<error to="fail"/>
</action>
<action name="Proc3">
<sub-workflow>
<app-path>${nameNode}${wfPath}/proc3_workflow.xml</app-path>
<propagate-configuration/>
</sub-workflow>
<ok to="joinProcessMain"/>
<error to="fail"/>
</action>
<kill name="fail">
<message>WF Failure, 'wf:lastErrorNode()' failed, error message[${wf:errorMessage(wf:lastErrorNode())}]</message>
</kill>
<end name="end"/>
Sub-WorkFlow:
<workflow-app xmlns="uri:oozie:workflow:0.2" name="Sub Process">
<start to="Step1"/>
<action name="Step1">
<java>
<job-tracker>${jobTracker}</job-tracker>
<name-node>${nameNode}</name-node>
<prepare>
<delete path="${step1JoinOutputPath}"/>
</prepare>
<configuration>
<property>
<name>mapred.queue.name</name>
<value>${queueName}</value>
</property>
</configuration>
<main-class>com.absd.mr.step1</main-class>
<arg>${wf:name()}</arg>
<arg>${wf:id()}</arg>
<arg>${tbMasterDataOutputPath}</arg>
<arg>${step1JoinOutputPath}</arg>
<arg>${tbQueryKeyPath}</arg>
<capture-output/>
</java>
<ok to="generateValidQueryKeys"/>
<error to="fail"/>
</action>
<action name="generateValidQueryKeys">
<pig>
<job-tracker>${jobTracker}</job-tracker>
<name-node>${nameNode}</name-node>
<prepare>
<delete path="${tbValidQuerysOutputPath}"/>
</prepare>
<configuration>
<property>
<name>pig.tmpfilecompression</name>
<value>true</value>
</property>
<property>
<name>pig.tmpfilecompression.codec</name>
<value>lzo</value>
</property>
<property>
<name>pig.output.map.compression</name>
<value>true</value>
</property>
<property>
<name>pig.output.map.compression.codec</name>
<value>lzo</value>
</property>
<property>
<name>pig.output.compression</name>
<value>true</value>
</property>
<property>
<name>pig.output.compression.codec</name>
<value>lzo</value>
</property>
<property>
<name>mapred.compress.map.output</name>
<value>true</value>
</property>
</configuration>
<script>${pigDir}/tb_calc_valid_accounts.pig</script>
<param>csvFilesDir=${csvFilesDir}</param>
<param>step1JoinOutputPath=${step1JoinOutputPath}</param>
<param>tbValidQuerysOutputPath=${tbValidQuerysOutputPath}</param>
<param>piMinFAs=${piMinFAs}</param>
<param>piMinAccounts=${piMinAccounts}</param>
<param>parallel=80</param>
</pig>
<ok to="aggregateAumData"/>
<error to="fail"/>
</action>
<action name="aggregateAumData">
<pig>
<job-tracker>${jobTracker}</job-tracker>
<name-node>${nameNode}</name-node>
<prepare>
<delete path="${tbCacheDataPath}"/>
</prepare>
<configuration>
<property>
<name>pig.tmpfilecompression</name>
<value>true</value>
</property>
<property>
<name>pig.tmpfilecompression.codec</name>
<value>lzo</value>
</property>
<property>
<name>pig.output.map.compression</name>
<value>true</value>
</property>
<property>
<name>pig.output.map.compression.codec</name>
<value>lzo</value>
</property>
<property>
<name>pig.output.compression</name>
<value>true</value>
</property>
<property>
<name>pig.output.compression.codec</name>
<value>lzo</value>
</property>
<property>
<name>mapred.compress.map.output</name>
<value>true</value>
</property>
</configuration>
<script>${pigDir}/aggregationLogic.pig</script>
<param>csvFilesDir=${csvFilesDir}</param>
<param>tbValidQuerysOutputPath=${tbValidQuerysOutputPath}</param>
<param>tbCacheDataPath=${tbCacheDataPath}</param>
<param>currDate=${date}</param>
<param>udfJarPath=${nameNode}${wfPath}/lib</param>
<param>parallel=150</param>
</pig>
<ok to="loadDataToDB"/>
<error to="fail"/>
</action>
<kill name="fail">
<message>WF Failure, 'wf:lastErrorNode()' failed, error message[${wf:errorMessage(wf:lastErrorNode())}]</message>
</kill>
<end name="end"/>
