[
https://issues.apache.org/jira/browse/HBASE-1205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Nitay Joffe updated HBASE-1205:
-------------------------------
Attachment: hbase-nitay-regionserver-aa0-000-12.u.powerset.com.log
hbase-1205.patch
In this patch:
We register the HRegionServer as a watcher on the master address ephemeral
ZNode in ZooKeeper. The HRegionServer watches for "NodeCreated" events on that
ZNode, which means a new master has come up and written its address to the
ZNode. When that event is received, we call getMaster() to set the hbaseMaster
instance variable to the new master address. Any current operations going on
which were using the old master will fail their retries eventually and get
automatically switched over to the new master next time.
I made the sleeper variable that's used in run() an instance variable so that I
can use it in other places like watchMasterAddress().
I tested this by taking down the master on my 4 node cluster and bringing it up
elsewhere. I've attached the log from a regionserver. This is the cool part:
{code}
2009-03-30 07:57:13,977 INFO org.apache.hadoop.ipc.HBaseClass: Retrying connect
to server: /208.76.44.158:60007. Already tried 0 time(s).
2009-03-30 07:57:14,987 INFO org.apache.hadoop.ipc.HBaseClass: Retrying connect
to server: /208.76.44.158:60007. Already tried 1 time(s).
2009-03-30 07:57:15,232 DEBUG
org.apache.hadoop.hbase.regionserver.HRegionServer: Got ZooKeeper event, state:
SyncConnected, type: NodeCreated, path: /hbase/master
2009-03-30 07:57:15,233 DEBUG
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Read ZNode /hbase/master
got 208.76.44.139:60007
2009-03-30 07:57:15,233 DEBUG
org.apache.hadoop.hbase.regionserver.HRegionServer: Telling master at
208.76.44.139:60007 that we are up
{code}
> RegionServers should find new master when a new master comes up.
> ----------------------------------------------------------------
>
> Key: HBASE-1205
> URL: https://issues.apache.org/jira/browse/HBASE-1205
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: Nitay Joffe
> Assignee: Nitay Joffe
> Attachments: hbase-1205.patch,
> hbase-nitay-regionserver-aa0-000-12.u.powerset.com.log
>
>
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
