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https://issues.apache.org/jira/browse/HDFS-8578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15103223#comment-15103223
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Tsz Wo Nicholas Sze commented on HDFS-8578:
-------------------------------------------
{quote}
1. Replace addBlockPoolStorage method with getBlockPoolSliceStorage. This just
changes the synchronization around adding things to bpStorageMap. The change
isn't necessary for the single threaded case, but doesn't hurt so we can commit
it before parallelizing.
2. Add the new createStorageID method to correctly handle upgrading from layout
versions earlier then ADD_DATANODE_AND_STORAGE_UUIDS. This seems like a
slightly separate issue, but I may be missing something. In any case, we can
probably commit this as well without the parallelization.
{quote}
Sure, let's do a code refactoring before changing to processing all
storage/data dirs in parallel. Filed HDFS-9654.
> 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-8578-16.patch, HDFS-8578-17.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,
> h8578_20151210.patch, h8578_20151211.patch, h8578_20151211b.patch,
> h8578_20151212.patch, h8578_20151213.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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