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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3449) Server shutdown handlers deadlocked waiting for META
Date Mon, 17 Jan 2011 21:43:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12982887#action_12982887

Todd Lipcon commented on HBASE-3449:

I'm guessing what happened is this:

- server 1 went down, was hosting META
- shutdown handler started running, said "reassign ROOT to server 2, reassign meta to server
- server 2 went down (this is rolling restart after all)
- shutdown handler for server 2 started running, reassigned ROOT to server 3
- server 3 went down

- so ROOT is still unassigned, but both meta shutdown handlers are blocked waiting on it.
It can't get reassigned since server 3's shutdown can't get processed

> Server shutdown handlers deadlocked waiting for META
> ----------------------------------------------------
>                 Key: HBASE-3449
>                 URL: https://issues.apache.org/jira/browse/HBASE-3449
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.0
>            Reporter: Todd Lipcon
>            Priority: Blocker
> I have a situation where both of my MASTER_META_SERVER_OPERATIONS handlers are handling
server shutdowns, and both of them are waiting on ROOT, which isn't coming up. Unclear exactly
how this happened, but I triggered it by doing a rolling restart.

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