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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4343) ZK recovery support for ResourceManager
Date Sun, 17 Jun 2012 16:51:42 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13393569#comment-13393569
] 

Tsuyoshi OZAWA commented on MAPREDUCE-4343:
-------------------------------------------

s/course/coarse/
                
> 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
>         Attachments: MR-4343.1.patch
>
>
> 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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