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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-3071) Graceful decommissioning of a regionserver
Date Tue, 29 Mar 2011 06:28:05 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-3071:
-------------------------

    Attachment: 3071.txt

A graceful shutdown shell script and a ruby script that will move the regions off the regionserver
one by one confirming region in new location before moving to the next.

> Graceful decommissioning of a regionserver
> ------------------------------------------
>
>                 Key: HBASE-3071
>                 URL: https://issues.apache.org/jira/browse/HBASE-3071
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: stack
>         Attachments: 3071.txt
>
>
> Currently if you stop a regionserver nicely, it'll put up its stopping flag and then
close all hosted regions.  While the stopping flag is in place all region requests are rejected.
 If this server was under load, closing could take a while.  Only after all is closed is the
master informed and it'll restart assigning (in old master, master woud get a report with
list of all regions closed, in new master the zk expired is triggered and we'll run shutdown
handler).
> At least in new master, we have means of disabling balancer, and then moving the regions
off the server one by one via HBaseAdmin methods -- we shoud write a script to do this at
least for rolling restarts -- but we need something better.

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