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From "Sebastien Rainville (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-743) bin/hbase migrate upgrade fails when redo logs exists
Date Fri, 18 Jul 2008 10:38:31 GMT

    [ https://issues.apache.org/jira/browse/HBASE-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12614690#action_12614690
] 

Sebastien Rainville commented on HBASE-743:
-------------------------------------------

Here's how I reproduce the problem:

(in hbase-0.1.3)
rm -Rf $HBASE_DATA_DIR
bin/start-hbase.sh
ls $HBASE_DATA_DIR => a redo log exists
bin/stop-hbase.sh
ls $HBASE_DATA_DIR => the redo log is not there anymore: so far so good
bin/start-hbase.sh
ls $HBASE_DATA_DIR => a redo log exists
kill -9 $HBASE_MASTER_PID
ls $HBASE_DATA_DIR => a redo log still exists
bin/start-hbase.sh
ls $HBASE_DATA_DIR => now there are 2 redo logs
bin/stop-hbase.sh
ls $HBASE_DATA_DIR => now there is only 1 redo log: the bad one

(in hbase-trunk)
bin/hbase migrate upgrade => FAIL because of an unrecovered redo log

Now, I don't know how that's supposed to be handled but the thing is that HBase wasn't always
very *stable* so remaining redo logs like that are likely to exist for other people so it's
going to come up again.


> bin/hbase migrate upgrade fails when redo logs exists
> -----------------------------------------------------
>
>                 Key: HBASE-743
>                 URL: https://issues.apache.org/jira/browse/HBASE-743
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.2.0
>            Reporter: Sebastien Rainville
>            Assignee: Izaak Rubin
>            Priority: Minor
>
> I migrated several hbase-0.1.3 instances to hbase trunk and even if I stop hbase-0.1.3
cleanup it leaves redo logs on hdfs. The problems is that when migrating the data with hbase-trunk
it fails because it finds these redo-logs and quit with a error message saying that we should
reinstall the old hbase and shut it down cleanly and that in theory it erases the redo logs.
The work around has been to delete the redo logs manually... which is bad.

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