@Override
  public int setRunningProcedureCount(int count) {
    // useless for region based storage.
    return count;
  }
A procedure store which uses the master local store to store all the procedures.
<p/>
We use proc:d column to store the serialized protobuf format procedure, and when deleting we will
first fill the proc:d column with an empty byte array, and then actually delete them in the
{@link #cleanup()} method. This is because that we need to retain the max procedure id, so we can
not directly delete a procedure row as we do not know if it is the one with the max procedure id.
hbase-server/src/main/java/org/apache/hadoop/hbase/procedure2/store/region/RegionProcedureStore.java