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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10271) [regression] Cannot use the wildcard address since HBASE-9593
Date Mon, 06 Jan 2014 23:01:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13863583#comment-13863583
] 

Lars Hofhansl commented on HBASE-10271:
---------------------------------------

I'll do the same from 0.94. I'd prefer not to introduce another heartbeat mechanism over what
we have from ZK. (we used to have heartbeats and then removed them in favor of ZK before my
time, right?)

> [regression] Cannot use the wildcard address since HBASE-9593
> -------------------------------------------------------------
>
>                 Key: HBASE-10271
>                 URL: https://issues.apache.org/jira/browse/HBASE-10271
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.0, 0.94.13, 0.96.1
>            Reporter: Jean-Daniel Cryans
>            Priority: Critical
>             Fix For: 0.98.0, 0.94.16, 0.96.2, 0.99.0
>
>         Attachments: HBASE-10271.patch
>
>
> HBASE-9593 moved the creation of the ephemeral znode earlier in the region server startup
process such that we don't have access to the ServerName from the Master's POV. HRS.getMyEphemeralNodePath()
calls HRS.getServerName() which at that point will return this.isa.getHostName(). If you set
hbase.regionserver.ipc.address to 0.0.0.0, you will create a znode with that address.
> What happens next is that the RS will report for duty correctly but the master will do
this:
> {noformat}
> 2014-01-02 11:45:49,498 INFO  [master:172.21.3.117:60000] master.ServerManager: Registering
server=0:0:0:0:0:0:0:0%0,60020,1388691892014
> 2014-01-02 11:45:49,498 INFO  [master:172.21.3.117:60000] master.HMaster: Registered
server found up in zk but who has not yet reported in: 0:0:0:0:0:0:0:0%0,60020,1388691892014
> {noformat}
> The cluster is then unusable.
> I think a better solution is to track the heartbeats for the region servers and expire
those that haven't checked-in for some time. The 0.89-fb branch has this concept, and they
also use it to detect rack failures: https://github.com/apache/hbase/blob/0.89-fb/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java#L1224.
In this jira's scope I would just add the heartbeat tracking and add a unit test for the wildcard
address.
> What do you think [~rajesh23]?



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