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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4343) ZK recovery support for ResourceManager
Date Sun, 17 Jun 2012 06:43:42 GMT
Harsh J created MAPREDUCE-4343:
----------------------------------

             Summary: ZK recovery support for ResourceManager
                 Key: MAPREDUCE-4343
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4343
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
            Reporter: Harsh J


MAPREDUCE-279 included bits and pieces of possible ZK integration for YARN's RM, but looks
like it failed to complete it (for scalability reasons? etc?) and there seems to be no JIRA
tracking this feature that has been already claimed publicly as a good part about YARN.

If it did complete it, we should document how to use it. Setting the following only yields:

{code}
<property>
<name>yarn.resourcemanager.store.class</name>
<value>org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKStore</value>
</property>
<property>
<name>yarn.resourcemanager.zookeeper-store.address</name>
<value>test.vm:2181/yarn-recovery-store</value>
</property>
{code}

{code}
Error starting ResourceManager
java.lang.RuntimeException: java.lang.NoSuchMethodException: org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKStore.<init>()
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:128)
at org.apache.hadoop.yarn.server.resourcemanager.recovery.StoreFactory.getStore(StoreFactory.java:32)
at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:621)
Caused by: java.lang.NoSuchMethodException: org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKStore.<init>()
at java.lang.Class.getConstructor0(Class.java:2706)
at java.lang.Class.getDeclaredConstructor(Class.java:1985)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:122)
... 2 more
{code}

This JIRA is hence filed to track the addition/completion of recovery via ZK.

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