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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15600) Add provision for adding mutations to memstore or able to write to same region in batchMutate coprocessor hooks
Date Wed, 27 Apr 2016 07:44:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15259720#comment-15259720
] 

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

{code}
 // Returned mutations from coprocessor correspond to the Mutation at index i. We can
3140	              // directly add the cells from those mutations to the familyMaps of this
mutation.
3141	              mergeFamilyMaps(familyMaps[i], cpFamilyMap); // will get added to the memstore
later
{code}
This makes things better. 
Do we need to check the status of the Operation if it is NOT_RUN and then only add the CP
mutations to it?  Wil there be such  a case?

> 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, 1.3.0, 1.4.0, 0.98.20
>
>         Attachments: HBASE-15600.patch, HBASE-15600_v1.patch, HBASE-15600_v2.patch, hbase-15600_v3.patch,
hbase-15600_v4.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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