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From "Uma Maheswara Rao G (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5733) AssignmentManager#processDeadServersAndRegionsInTransition can fail with NPE.
Date Tue, 17 Apr 2012 06:07:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255348#comment-13255348

Uma Maheswara Rao G commented on HBASE-5733:

Yeah, I just seen that in logs in real cluster with this situation. I will remove that explicit
FATAL log here. 
2012-04-17 11:18:39,353 FATAL org.apache.hadoop.hbase.master.AssignmentManager: Problem in
getting the children from ZK. Going to abort
2012-04-17 11:18:39,354 FATAL org.apache.hadoop.hbase.master.HMaster: Master server abort:
loaded coprocessors are: []
2012-04-17 11:18:39,354 FATAL org.apache.hadoop.hbase.master.HMaster: Problem in getting the
children from ZK
java.io.IOException: Failed to get the children from ZK
	at org.apache.hadoop.hbase.master.AssignmentManager.processDeadServersAndRegionsInTransition(AssignmentManager.java:398)
	at org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:347)
	at org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:537)
	at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:343)
	at java.lang.Thread.run(Thread.java:662)
2012-04-17 11:18:39,355 INFO org.apache.hadoop.hbase.master.HMaster: Aborting

> AssignmentManager#processDeadServersAndRegionsInTransition can fail with NPE.
> -----------------------------------------------------------------------------
>                 Key: HBASE-5733
>                 URL: https://issues.apache.org/jira/browse/HBASE-5733
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.96.0
>            Reporter: Uma Maheswara Rao G
>            Assignee: Uma Maheswara Rao G
>         Attachments: HBASE-5733.patch, HBASE-5733.patch
> Found while going through the code...
> AssignmentManager#processDeadServersAndRegionsInTransition can fail with NPE as this
is directly iterating the nodes from listChildrenAndWatchForNewChildren with-out checking
for null.
> Here also we need to handle with  null  check like other places.

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