public FileSystem getWALFileSystem() {
    return this.walFs;
  }
Create initial layout in filesystem.
<ol>
<li>Check if the meta region exists and is readable, if not create it. Create hbase.version and
the hbase:meta directory if not one.</li>
</ol>
Idempotent.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java