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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7692) DataStorage#addStorageLocations(...) should support MultiThread to speedup the upgrade of block pool at multi storage directories.
Date Fri, 06 Feb 2015 21:50:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14309994#comment-14309994
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Tsz Wo Nicholas Sze commented on HDFS-7692:
-------------------------------------------

I think we don't need DFS_DATANODE_DIRECTORYSCAN_THREADS_KEY.  Since the number of dataDirs
won't be large, why don't always use dataDirs.size()?

> DataStorage#addStorageLocations(...) should support MultiThread to speedup the upgrade
of block pool at multi storage directories.
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-7692
>                 URL: https://issues.apache.org/jira/browse/HDFS-7692
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.5.2
>            Reporter: Leitao Guo
>         Attachments: HDFS-7692.01.patch
>
>
> {code:title=DataStorage#addStorageLocations(...)|borderStyle=solid}
>     for (StorageLocation dataDir : dataDirs) {
>       File root = dataDir.getFile();
>      ... ...
>         bpStorage.recoverTransitionRead(datanode, nsInfo, bpDataDirs, startOpt);
>         addBlockPoolStorage(bpid, bpStorage);
>     ... ...
>       successVolumes.add(dataDir);
>     }
> {code}
> In the above code the storage directories will be analyzed one by one, which is really
time consuming when upgrading HDFS with datanodes have dozens of large volumes.  MultiThread
dataDirs analyzing should be supported here to speedup upgrade.



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