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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8578) On upgrade, Datanode should process all storage/data dirs in parallel
Date Fri, 06 Nov 2015 02:29:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14992965#comment-14992965

Duo Zhang commented on HDFS-8578:

Could we assign these values earlier at the time you load properties from all the StorageDirectories
for getting datanodeUuid? This could make things more clear.
Use multiple threads to write a shared field without locking is not a good choice although
we do not have any problem right now. It implies that the method is thread safe so later people
may add some dangerous code in the method...


> 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-branch-2.6.0.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
> Can we make datanode to process all storage dirs parallelly?

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