Examples of org.apache.hadoop.hbase.HMsg

org.apache.hadoop.hbase.HMsg
HMsg is for communicating instructions between the HMaster and the HRegionServers. Most of the time the messages are simple but some messages are accompanied by the region affected. HMsg may also carry optional message.

    reportClose(region, null);
  }


  /* Add to the outbound message buffer */
  private void reportClose(final HRegionInfo region, final byte[] message) {
    outboundMsgs.add(new HMsg(HMsg.Type.MSG_REPORT_CLOSE, region, message));
  }

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   * updated the meta or root regions, and the master will pick that up on its
   * next rescan of the root or meta tables.
   */
  void reportSplit(HRegionInfo oldRegion, HRegionInfo newRegionA,
      HRegionInfo newRegionB) {
    outboundMsgs.add(new HMsg(HMsg.Type.MSG_REPORT_SPLIT, oldRegion,
      (oldRegion.getRegionNameAsString() + " split; daughters: " +
        newRegionA.getRegionNameAsString() + ", " +
        newRegionB.getRegionNameAsString()).getBytes()));
    outboundMsgs.add(new HMsg(HMsg.Type.MSG_REPORT_OPEN, newRegionA));
    outboundMsgs.add(new HMsg(HMsg.Type.MSG_REPORT_OPEN, newRegionB));
  }

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   * and then while the region is being opened, it is called from the Worker
   * thread that is running the region open.
   * @param hri Region to add the message for
   */
  protected void addProcessingMessage(final HRegionInfo hri) {
    getOutboundMsgs().add(new HMsg(HMsg.Type.MSG_REPORT_PROCESS_OPEN, hri));
  }

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    LOG.info("Assigning region " + Bytes.toString(regionName) + " to " + serverName);
    rs.setPendingOpen(serverName);
    this.regionsInTransition.put(regionName, rs);
    this.historian.addRegionAssignment(rs.getRegionInfo(),
        serverName);
    returnMsgs.add(new HMsg(HMsg.Type.MSG_REGION_OPEN, rs.getRegionInfo()));
  }

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        continue;
      }
      LOG.debug("Going to close region " +
          currentRegion.getRegionNameAsString());
      // make a message to close the region
      returnMsgs.add(new HMsg(HMsg.Type.MSG_REGION_CLOSE, currentRegion,
        OVERLOADED, inSafeMode()));
      // mark the region as closing
      setClosing(serverName, currentRegion, false);
      setPendingClose(currentRegion.getRegionName());
      // increment the count of regions we've marked

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        Pair<HRegionInfo,HServerAddress> pair = i.next();
        if (addr.equals(pair.getSecond())) {
          if (LOG.isDebugEnabled()) {
            LOG.debug("Sending " + msg + " " + pair.getFirst() + " to " + addr);
          }
          returnMsgs.add(new HMsg(msg, pair.getFirst(), inSafeMode()));
          i.remove();
        }
      }
    }
  }

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    }


    synchronized (master.regionManager) {
      // Tell the region server to close regions that we have marked for closing.
      for (HRegionInfo i: master.regionManager.getMarkedToClose(serverName)) {
        returnMsgs.add(new HMsg(HMsg.Type.MSG_REGION_CLOSE, i,
            master.regionManager.inSafeMode()));
        // Transition the region from toClose to closing state
        master.regionManager.setPendingClose(i.getRegionName());
      }

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        // This Region should not have been opened.
        // Ask the server to shut it down, but don't report it as closed.  
        // Otherwise the HMaster will think the Region was closed on purpose, 
        // and then try to reopen it elsewhere; that's not what we want.
        returnMsgs.add(new HMsg(HMsg.Type.MSG_REGION_CLOSE_WITHOUT_REPORT,
            region, "Duplicate assignment".getBytes(),
            master.regionManager.inSafeMode()));
      } else {
        if (region.isRootRegion()) {
          // it was assigned, and it's not a duplicate assignment, so take it out

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        LOG.info("assigning region " +
          Bytes.toString(regionInfo.getRegionName())+
          " to server " + serverName);
        unassignedRegions.put(regionInfo, Long.valueOf(now));
        this.historian.addRegionAssignment(regionInfo, serverName);
        returnMsgs.add(new HMsg(HMsg.Type.MSG_REGION_OPEN, regionInfo));
        if (--nregions <= 0) {
          break;
        }
      }
    }

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      LOG.info("assigning region " +
          Bytes.toString(regionInfo.getRegionName()) +
          " to the only server " + serverName);
      unassignedRegions.put(regionInfo, Long.valueOf(now));
      this.historian.addRegionAssignment(regionInfo, serverName);
      returnMsgs.add(new HMsg(HMsg.Type.MSG_REGION_OPEN, regionInfo));
    }
  }

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