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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2002) Coprocessors: Client side support
Date Fri, 19 Nov 2010 00:03:14 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Helmling updated HBASE-2002:
---------------------------------

    Release Note: 
Adds new HTable.coprocessorProxy() and HTable.coprocessorExec() calls, along with server-side
hooks for registering user RPC protocol handlers.  Together these allow the invocation and
execution of custom server-side code configured as coprocessors.

Adds pluggable RPC engines as a first step towards alternate RPC implementations.  This adds
a field for the RPC protocol interface on connection setup, so it's not RPC wire compatible
with previous versions.
          Status: Patch Available  (was: Open)

Updated version of review board patch now attached

> Coprocessors: Client side support
> ---------------------------------
>
>                 Key: HBASE-2002
>                 URL: https://issues.apache.org/jira/browse/HBASE-2002
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Andrew Purtell
>            Assignee: Gary Helmling
>             Fix For: 0.92.0
>
>         Attachments: HBASE-2002_final.patch
>
>
> "High-level call interface for clients. Unlike RPC, calls addressed to rows or ranges
of rows. Coprocessor client library resolves to actual locations. Calls across multiple rows
automatically split into multiple parallelized RPCs"
> Generic multicall RPC facility which incorporates this and multiget/multiput/multidelete
and parallel scanners.
> Group and batch RPCs by region server. Track and retry outstanding RPCs. Ride over region
relocations. 
> Support addressing by explicit region identifier or by row key or row key range. 
> Include a facility for merging results client side. 

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