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Date: Thu, 7 Apr 2016 15:59:25 +0000 (UTC)
From: "ramkrishna.s.vasudevan (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12956776.1460011571000.164508.1460044765587@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-15600) Add provision for adding mutations
 to memstore or able to write to same region in batchMutate coprocessor
 hooks
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    [ https://issues.apache.org/jira/browse/HBASE-15600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15230466#comment-15230466 ] 

ramkrishna.s.vasudevan commented on HBASE-15600:
------------------------------------------------

Just saw the discussion. Will check the patch and get back here sooner.

> Add provision for adding mutations to memstore or able to write to same region in batchMutate coprocessor hooks
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-15600
>                 URL: https://issues.apache.org/jira/browse/HBASE-15600
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Rajeshbabu Chintaguntla
>            Assignee: Rajeshbabu Chintaguntla
>             Fix For: 2.0.0, 0.98.19, 1.1.5, 1.2.2, 1.0.5
>
>         Attachments: HBASE-15600.patch, HBASE-15600_v1.patch, HBASE-15600_v2.patch
>
>
> As part of PHOENIX-1734 we need to write the index updates to same region from coprocessors but writing from batchMutate API is not allowed because of mvcc. 
> Raised PHOENIX-2742 to discuss any alternative way to write to the same region directly or not but not having any proper solution there.
> Currently we have provision to write wal edits from coprocessors. We can set wal edits in MiniBatchOperationInProgress.
> {noformat}
>   /**
>    * Sets the walEdit for the operation(Mutation) at the specified position.
>    * @param index
>    * @param walEdit
>    */
>   public void setWalEdit(int index, WALEdit walEdit) {
>     this.walEditsFromCoprocessors[getAbsoluteIndex(index)] = walEdit;
>   }
> {noformat}
> Similarly we can allow to write mutations from coprocessors to memstore as well. Or else we should provide the batch mutation API allow write in batch mutate coprocessors.


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