private void postSnapshot(MasterProcedureEnv env) throws IOException {
    SnapshotManager sm = env.getMasterServices().getSnapshotManager();
    if (sm != null) {
      sm.unregisterSnapshotProcedure(snapshot, getProcId());
    }
  }
A procedure used to take snapshot on tables.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/SnapshotProcedure.java