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Date: Thu, 2 Jan 2014 21:47:50 +0000 (UTC)
From: "Jean-Daniel Cryans (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Created] (HBASE-10271) [regression] Cannot use the wildcard
 address since HBASE-9593
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Jean-Daniel Cryans created HBASE-10271:
------------------------------------------

             Summary: [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: 0.96.1, 0.94.13
            Reporter: Jean-Daniel Cryans
            Priority: Critical


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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