public boolean isWALVisited() {
      return isVisited;
    }
This listens to the {@link #visitLogEntryBeforeWrite(RegionInfo, WALKey, WALEdit)} to identify
that an entry is written to the Write Ahead Log for the given table.
hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestImportExport.java