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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-932) Regionserver restart
Date Fri, 17 Oct 2008 17:00:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640579#action_12640579

stack commented on HBASE-932:

2008-10-17 10:26:25,374 FATAL org.apache.hadoop.hbase.regionserver.Flusher: Replay of hlog
required. Forcing server restart

In above case, regionserver wants to replay the WAL because flush failed usually because hdfs
is hosed.  In above, could restart itself and perhaps all would be well when it came back
up (probably not though -- if hdfs is horked... but hbase should try all the possibilities
until admin shows up)

> Regionserver restart
> --------------------
>                 Key: HBASE-932
>                 URL: https://issues.apache.org/jira/browse/HBASE-932
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
> If we drop a flush or we fail close a write-ahead log, we currently shutdown the regionserver
(we fail because of hdfs usually).  Rather than shut themselves down, how about they restart?
 The restart at least in the HBASE-930 might fix the issue shaking DFSClient so it gets sense
again.  Even is HDFS is bad, it'll come around eventually.  The HRS restarting itself plus
HBASE-926 fix will make for fast recovery.

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