boolean checkFileSystem() {
    if (this.dataFsOk && this.dataFs != null) {
      try {
        FSUtils.checkFileSystemAvailable(this.dataFs);
      } catch (IOException e) {
        abort("File System not available", e);
        this.dataFsOk = false;
      }
    }
    return this.dataFsOk;
  }
Checks to see if the file system is still accessible. If not, sets abortRequested and
stopRequested
@return false if file system is not available
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java