void internEncodedRegionName(byte[] encodedRegionName) {
    // We should not use this as a setter - only to swap
    // in a new reference to the same table name.
    assert Bytes.equals(this.encodedRegionName, encodedRegionName);
    this.encodedRegionName = encodedRegionName;
  }
Drop this instance's region name byte array and instead hold a reference to the provided region
name. This is not meant to be a general purpose setter - it's only used to collapse references
to conserve memory.
hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALKeyImpl.java