public RegionServerServices getRSServices() {
      return this.rsServices;
    }
The {@link WAL#sync} would timeout and throws {@link WALSyncTimeoutIOException},when
{@link HRegion#doWALAppend} catches this exception it aborts the RegionServer.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALSyncTimeoutException.java