Reid Chan created HBASE-22861:
---------------------------------

             Summary: [WAL] Merged region should get its WAL according to 
WALProvider.
                 Key: HBASE-22861
                 URL: https://issues.apache.org/jira/browse/HBASE-22861
             Project: HBase
          Issue Type: Bug
            Reporter: Reid Chan


This one is similar to HBASE-22774.

Merging regions works fine by default because all regions shared one wal. But 
if multiwal is enabled, merged region should get its wal according to strategy.

{code:title=HRegion.java|borderStyle=solid}
  HRegion createMergedRegionFromMerges(final HRegionInfo mergedRegionInfo,
      final HRegion region_b) throws IOException {
    HRegion r = HRegion.newHRegion(this.fs.getTableDir(),
        this.getWAL(), // Here should use rsService.getWAL(mergedRegionInfo), 
then wal provider and strategy if there is will take effect.
        fs.getFileSystem(), this.getBaseConf(), mergedRegionInfo,
        this.getTableDesc(), this.rsServices);
    ...

    return r;
  }
{code}




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