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Date: Thu, 22 Apr 2010 14:47:50 -0400 (EDT)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hbase-issues@hadoop.apache.org
Subject: [jira] Commented: (HBASE-2479) NPE in master when meta is
 unavailable
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    [ https://issues.apache.org/jira/browse/HBASE-2479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859951#action_12859951 ] 

Todd Lipcon commented on HBASE-2479:
------------------------------------

Here's my modified doWithRetries:
{code}
 57   protected T doWithRetries()
 58   throws IOException, RuntimeException {
 59     List<IOException> exceptions = new ArrayList<IOException>();
 60     for (int tries = 0; tries < this.master.numRetries; tries++) {
 61       if (this.master.closed.get()) {
 62         return null;
 63       }
 64       try {
 65         // Seen an NPE here before, adding lots of logging to try to find it!
 66         if (this.master == null) {
 67           ReflectionUtils.logThreadInfo(LOG, "master null", 1);
 68         } else if (this.master.connection == null) {
 69           ReflectionUtils.logThreadInfo(LOG, "connection null", 1);
 70         } else if (m == null) {
 71           ReflectionUtils.logThreadInfo(LOG, "m null", 1);
 72         }
 73 
 74         this.server =
 75           this.master.connection.getHRegionConnection(m.getServer());
 76         return this.call();
{code}

> NPE in master when meta is unavailable
> --------------------------------------
>
>                 Key: HBASE-2479
>                 URL: https://issues.apache.org/jira/browse/HBASE-2479
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: master
>            Reporter: Todd Lipcon
>         Attachments: npe-log.txt
>
>
> A couple times I've managed to get NPEs when processing region status messages due to META being unavailable. Will attach a log segment here.

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