public void cleanupMergedRegion(final RegionInfo mergedRegion) throws IOException {
    Path regionDir = new Path(this.tableDir, mergedRegion.getEncodedName());
    if (this.fs.exists(regionDir) && !this.fs.delete(regionDir, true)) {
      throw new IOException("Failed delete of " + regionDir);
    }
  }
Remove merged region
@param mergedRegion {@link RegionInfo}
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionFileSystem.java