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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19261) ClusterStatusPublisher where Master could optionally broadcast notice of dead servers is broke
Date Wed, 15 Nov 2017 21:16:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16254207#comment-16254207
] 

stack commented on HBASE-19261:
-------------------------------

This multicast feature seems to work on linux, not on macosx. More work to do in here figuring
if this feature is still fit and if not, pulling it altogether. See the disabled TestHCM#testClusterStatus
test for a convenient way of testing this facility.

> ClusterStatusPublisher where Master could optionally broadcast notice of dead servers
is broke
> ----------------------------------------------------------------------------------------------
>
>                 Key: HBASE-19261
>                 URL: https://issues.apache.org/jira/browse/HBASE-19261
>             Project: HBase
>          Issue Type: Bug
>          Components: MTTR
>            Reporter: stack
>
> An old feature that you could optionally enable so Master would broadcast via UDP/Multicast
messages to registered clients when it learned of dead servers is broken in hbase2. It was
added here:
> commit c352a848a1af318df4f0348728fb136ce289d3e4
> Author: nkeywal <nkeywal@unknown>
> Date:   Tue Mar 19 10:07:17 2013 +0000
>     HBASE-7590 Add a costless notifications mechanism from master to regionservers &
clients - new files
> It could help the recalibration of clients on server death run quicker. I have not stats
on how often it was use if at all.
> I tried playing around with it to try and get it going again but need to spend more time
on it. Putting aside for now. 
> We should make it work again and then talk it up as a mechanism that can help improve
MTTR (or strip it).



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