[jira] [Updated] (HBASE-7715) FSUtils#waitOnSafeMode can incorrectly loop on standby NN

["Ted Yu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-7715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Yu updated HBASE-7715:
--------------------------

    Attachment: 7715-trunk.txt

Trunk patch which utilizes the following method from DistributedFileSystem:
{code}
  public boolean setSafeMode(HdfsConstants.SafeModeAction action,
      boolean isChecked) throws IOException {
{code}
                
> 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
>         Attachments: 7715-trunk.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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