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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7715) FSUtils#waitOnSafeMode can incorrectly loop on standby NN
Date Wed, 30 Jan 2013 04:51:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13566161#comment-13566161
] 

Uma Maheswara Rao G commented on HBASE-7715:
--------------------------------------------

In DistributedFileSystem there is another API that can be used as Util API. That is defaulting
that flag as true.
{code}
 public boolean isInSafeMode() throws IOException {
    return setSafeMode(SafeModeAction.SAFEMODE_GET, true);
  }
{code}

Yes, we found this issue some time back. Here is the JIRA HDFS-3507.
This was committed in 2.0.3.
                
> FSUtils#waitOnSafeMode can incorrectly loop on standby NN
> ---------------------------------------------------------
>
>                 Key: HBASE-7715
>                 URL: https://issues.apache.org/jira/browse/HBASE-7715
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.4
>            Reporter: Andrew Wang
>            Assignee: Ted Yu
>             Fix For: 0.96.0
>
>         Attachments: 7715-trunk-v2.txt
>
>
> We encountered an issue where HMaster failed to start with an active NN not in safe mode
and a standby NN in safemode. The relevant lines in {{FSUtils.java}} show the issue:
> {noformat}
>     while (dfs.setSafeMode(org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction.SAFEMODE_GET))
{
> {noformat}
> This call skips the normal client failover from the standby to active NN, so it will
loop polling the standby NN if it unfortunately talks to the standby first.

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