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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8251) enable SSH before assign META on Master startup
Date Sat, 06 Apr 2013 03:19:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13624304#comment-13624304
] 

Jeffrey Zhong commented on HBASE-8251:
--------------------------------------

[~zjushch] Thanks for the very good question!

{quote}
How about if ROOT and META are on the same regionserver?
{quote}

I handled this in MetaSSH, you can check details in the patch of hbase-7828(I pasted the related
code below). It basically wait for master meta assignment done then handle a deadButNotExpired
Meta RS.

{code}
+      if(!this.services.isServerShutdownHandlerEnabled()) {
+        // resubmit in case we're in master initialization and SSH hasn't been enabled yet.
+        this.services.getExecutorService().submit(this);
+        this.deadServers.add(serverName);
+      }
{code}
                
> enable SSH before assign META on Master startup
> -----------------------------------------------
>
>                 Key: HBASE-8251
>                 URL: https://issues.apache.org/jira/browse/HBASE-8251
>             Project: HBase
>          Issue Type: Bug
>          Components: master, Region Assignment
>    Affects Versions: 0.94.6
>            Reporter: Jieshan Bean
>            Assignee: Jieshan Bean
>         Attachments: HBASE-8251-94.patch
>
>
> I think HBASE-5918 could not fix this issue. In HMaster#assignRootAndMeta:
> 1. Assign ROOT.
> 2. Block until ROOT be opened.
> 3. Assign META.
> 4. Block until META be opened.
> SSH is enabled after step 4. So if the RS who host ROOT dies before step 4, master will
be blocked.

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