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Date: Fri, 1 Apr 2016 16:53:26 +0000 (UTC)
From: "churro morales (JIRA)" <jira@apache.org>
To: dev@hbase.apache.org
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Subject: [jira] [Resolved] (HBASE-12814) Zero downtime upgrade from 94 to 98
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     [ https://issues.apache.org/jira/browse/HBASE-12814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

churro morales resolved HBASE-12814.
------------------------------------
    Resolution: Not A Problem

Most likely everyone is off the 94 branch.  

> Zero downtime upgrade from 94 to 98 
> ------------------------------------
>
>                 Key: HBASE-12814
>                 URL: https://issues.apache.org/jira/browse/HBASE-12814
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 0.94.26, 0.98.10
>            Reporter: churro morales
>            Assignee: churro morales
>         Attachments: HBASE-12814-0.94.patch, HBASE-12814-0.98.patch
>
>
> Here at Flurry we want to upgrade our HBase cluster from 94 to 98 while not having any downtime and maintaining master / master replication. 
> Summary:
> Replication is done via thrift RPC between clusters.  It is configurable on a peer by peer basis and the one caveat is that a thrift server starts up on every node which proxies the request to the ReplicationSink.  
> For the upgrade process:
> * in hbase-site.xml two new configuration parameters are added:
> ** *Required*
> *** hbase.replication.sink.enable.thrift -> true
> *** hbase.replication.thrift.server.port -> <thrit_server_port>
> ** *Optional*
> *** hbase.replication.thrift.protection {default: AUTHENTICATION}
> *** hbase.replication.thrift.framed {default: false}
> *** hbase.replication.thrift.compact {default: true}
> - All regionservers can be rolling restarted (no downtime), all clusters must have the respective patch for this to work.
> - the hbase shell add_peer command takes an additional parameter for rpc protocol
> - example: {code} add_peer '1' "hbase-101:2181:/hbase", "THRIFT" {code}
> Now comes the fun part when you want to upgrade your cluster from 94 to 98 you simply pause replication to the cluster being upgraded, do the upgrade and un-pause replication.  Once you have a pair of clusters only replicating inbound and outbound with the 98 release.  You can start replicating via the native rpc protocol by adding the peer again without the _THRIFT_ parameter and subsequently deleting the peer with the thrift protocol.  Because replication is idempotent I don't see any issues as long as you wait for the backlog to drain after un-pausing replication. 
> Special thanks to Francis Liu at Yahoo for laying the groundwork and Mr. Dave Latham for his invaluable knowledge and assistance.  


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