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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-1166) Avoid HTable creation in coprocessors to write into local index table
Date Thu, 14 Aug 2014 22:41:18 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14097829#comment-14097829
] 

Jeffrey Zhong commented on PHOENIX-1166:
----------------------------------------

{quote}
Which uses a CoprocessorHConnection to get a 'backdoor' connection to the region if it is
present on the local server. It avoids serializing/deserializing the data and writes directly
to the region
{quote}
The 'backdoor' connection only saves the IPC layer overhead such as serializing data into
underlying socket & deserializing data from socket. But there are other steps when we
call HTable.batch() such as following:

1) locating region where the traffic are going to be sent
2) PBed data to prepare the RPC call multi
3) Call client(BlockingInterface) to conduct the RPC call (this is where our backdoor connection
in place & save remote RPC)
4) Deserialize the PBed data from multi call
5) Internally call HRegion.batchMutate()

Therefore, current patch can save some work.

While 1) the current patch misses built-in retry logic from HTable which should be added into
and 2) doesn't handle the case when getIndexRegion returns null.




> Avoid HTable creation in coprocessors to write into local index table
> ---------------------------------------------------------------------
>
>                 Key: PHOENIX-1166
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-1166
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: rajeshbabu
>            Assignee: rajeshbabu
>             Fix For: 5.0.0, 4.1
>
>         Attachments: PHOENIX-1166.patch
>
>
> Since data table regions and local index regions colocated, we can get index region directly
from RS online regions and write to it.



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