boolean isInMemStore() {
    return this.inMemstore;
  }
@param inMemstore If true, then this is a data edit, one that came from client. If false, it is
                  a meta edit made by the hbase system itself and is for the WAL only.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSWALEntry.java