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.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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