[jira] [Created] (HDFS-8578) On upgrade, Datanode should process all storage/data dirs in parallel

["Raju Bairishetti (JIRA)" <ji...@apache.org>]

Raju Bairishetti created HDFS-8578:
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             Summary: On upgrade, Datanode should process all storage/data dirs in parallel
                 Key: HDFS-8578
                 URL: https://issues.apache.org/jira/browse/HDFS-8578
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
            Reporter: Raju Bairishetti
            Priority: Critical


Right now, during upgrades datanode is processing all the storage dirs sequentially. Assume it takes ~20 mins to process a single storage dir then  datanode which has ~10 disks will take around 3hours to come up.

{code}
   for (int idx = 0; idx < getNumStorageDirs(); idx++) {
      doTransition(datanode, getStorageDir(idx), nsInfo, startOpt);
      assert getCTime() == nsInfo.getCTime() 
          : "Data-node and name-node CTimes must be the same.";
    }
{code}

Can we make datanode to process all the staorage dirs parallelly? This saves lots of time during upgrades.




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