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From "Enis Soztutar (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, 08 Jun 2016 17:59:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15321078#comment-15321078
] 

Enis Soztutar commented on HBASE-15600:
---------------------------------------

[~ndimiduk], [~busbey] any thoughts about this going into 1.1 and 1.2 respectively? This is
new feature for sure, and according to the guidelines we should not push this to 1.1, and
1.2. But I think we can make an exception for this case, since the new local index re-write
in Phoenix needs to depend on this to have atomic local index updates and overall better throughput.
Phoenix will likely still depend on 1.1 and 1.2 for some more time. 

As for the patch, it adds a new method in a InterfaceAudience.LimitedPrivate(Coprocessor).
I think the binary compat is not affected unless you are using the new method, but we can
check that with a report. 

> 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
>              Labels: phoenix
>             Fix For: 2.0.0, 1.3.0, 1.4.0, 0.98.21
>
>         Attachments: HBASE-15600.patch, HBASE-15600_v1.patch, HBASE-15600_v2.patch, hbase-15600_v3.patch,
hbase-15600_v4.patch, hbase-15600_v5.patch, hbase-15600_v6.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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