Examples of RaidTaskCommand

org.apache.hadoop.hdfs.server.protocol.RaidTaskCommand
A RaidTaskCommand is an instruction to a datanode regarding some raid tasks. It tells the Datanode to construct some blocks and send them to given datanodes. RaidTaskCommand format: # of tasks For each RaidTask: RaidTask When datanode receives the command, it will iterate all RaidTask one by one. For each RaidTask, it reads *good* blocks from the machines, and generates the target blocks. Then it sends the constructed blocks to the machines provided.

Examples of org.apache.hadoop.hdfs.server.protocol.RaidTaskCommand

    public void _processEventIO(InjectionEventI event, Object... args) 
        throws IOException {
      if (event == InjectionEvent.DATANODE_PROCESS_RAID_TASK) {
        int namespaceId = nn.getNamespaceID();
        DataNode dn = (DataNode)args[0];
        RaidTaskCommand rtc = (RaidTaskCommand)args[1];
        RaidTask[] tasks = rtc.tasks;
        for (RaidTask rw: tasks) {
          // Generate all parity block locally instead of sending them remotely
          try {
            for (int idx = 0; idx < rw.toRaidIdxs.length; idx++) {

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Examples of org.apache.hadoop.hdfs.server.protocol.RaidTaskCommand

      tasks.addAll(raidDecodingTasks.pollN(
          Math.min(raidDecodingTasks.size(), maxDecodingTasks)));
    }
    
    return (tasks.size() == 0) ?
        null : new RaidTaskCommand(DatanodeProtocol.DNA_RAIDTASK, 
                        tasks.toArray(new RaidTask[tasks.size()]));
  }

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