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From "Rajeshbabu Chintaguntla (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15600) Add provision for adding mutations to memstore or able to write to same region in batchMutate coprocessor hooks
Date Thu, 07 Apr 2016 06:46:25 GMT
Rajeshbabu Chintaguntla created HBASE-15600:
-----------------------------------------------

             Summary: 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: 1.0.5, 2.0.0, 0.98.19, 1.1.5, 1.2.2


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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