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https://issues.apache.org/jira/browse/HDFS-8578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15054421#comment-15054421
]
Vinayakumar B commented on HDFS-8578:
-------------------------------------
[~szetszwo], thanks for taking this up and for simple way of parallel upgrade.
I have checked the latest patch.
In case of normal "start-dfs.sh -upgrade", I observe below log.
{noformat}2015-12-12 22:34:09,126 WARN common.Storage
(BlockPoolSliceStorage.java:loadBpStorageDirectories(225)) - Failed to analyze
storage directories for block pool BP-1461195821-127.0.0.1-1449939842938
java.io.IOException: Data-node and name-node CTimes must be the same.
at
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceStorage.loadStorageDirectory(BlockPoolSliceStorage.java:184)
at
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceStorage.loadBpStorageDirectories(BlockPoolSliceStorage.java:221)
at
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceStorage.recoverTransitionRead(BlockPoolSliceStorage.java:249)
at
org.apache.hadoop.hdfs.server.datanode.DataStorage.addStorageLocations(DataStorage.java:442)
at
org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:526)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:1523)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1484)
at
org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:320)
at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:228)
at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:829)
at java.lang.Thread.run(Thread.java:745){noformat}
Still I see that storagedir was added to successVolumes, that means, any
exceptions inside call(), will be ignored..?
> 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
>
>
> 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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