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Date: Thu, 10 Dec 2015 19:07:11 +0000 (UTC)
From: "Chris Trezzo (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-8578) On upgrade, Datanode should process
 all storage/data dirs in parallel
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    [ https://issues.apache.org/jira/browse/HDFS-8578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15051472#comment-15051472 ] 

Chris Trezzo commented on HDFS-8578:
------------------------------------

I agree with [~szetszwo] let's fix the OOM part in a follow up jira. It wound up being more complicated then I originally thought. I also agree that we should make the number of parallel storage dir threads configurable so that users have some way to control the memory footprint of the upgrade.

> 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: Improvement
>          Components: datanode
>            Reporter: Raju Bairishetti
>            Assignee: Vinayakumar B
>            Priority: Critical
>         Attachments: HDFS-8578-01.patch, HDFS-8578-02.patch, HDFS-8578-03.patch, HDFS-8578-04.patch, HDFS-8578-05.patch, HDFS-8578-06.patch, HDFS-8578-07.patch, HDFS-8578-08.patch, HDFS-8578-09.patch, HDFS-8578-10.patch, HDFS-8578-11.patch, HDFS-8578-12.patch, HDFS-8578-13.patch, HDFS-8578-14.patch, HDFS-8578-15.patch, HDFS-8578-branch-2.6.0.patch, HDFS-8578-branch-2.7-001.patch, HDFS-8578-branch-2.7-002.patch, HDFS-8578-branch-2.7-003.patch
>
>
> 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.
> *BlockPoolSliceStorage.java*
> {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}
> It would save lots of time during major upgrades if datanode process all storagedirs/disks parallelly.
> Can we make datanode to process all storage dirs parallelly?


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