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https://issues.apache.org/jira/browse/HDFS-13677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16830191#comment-16830191
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Stephen O'Donnell commented on HDFS-13677:
------------------------------------------
[~arpitagarwal] I have uploaded a patch based on the 2.9 branch. Two changes
were needed:
1. Remove Lamdas and replace with nested for loops.
2. Replace String.join with StringUtils.join as String.join does not exist in
Java 7.
I ran both the changed test classes locally and they all passed and the code
compiles under Java 7.
> Dynamic refresh Disk configuration results in overwriting VolumeMap
> -------------------------------------------------------------------
>
> Key: HDFS-13677
> URL: https://issues.apache.org/jira/browse/HDFS-13677
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: xuzq
> Assignee: xuzq
> Priority: Blocker
> Fix For: 3.3.0, 3.2.1, 3.1.3
>
> Attachments: HDFS-13677-001.patch, HDFS-13677-002-2.9-branch.patch,
> HDFS-13677-002.patch, image-2018-06-14-13-05-54-354.png,
> image-2018-06-14-13-10-24-032.png
>
>
> When I added a new disk by dynamically refreshing the configuration, an
> exception "FileNotFound while finding block" was caused.
>
> The steps are as follows:
> 1.Change the hdfs-site.xml of DataNode to add a new disk.
> 2.Refresh the configuration by "./bin/hdfs dfsadmin -reconfig datanode
> ****:50020 start"
>
> The error is like:
> ```
> VolumeScannerThread(/media/disk5/hdfs/dn): FileNotFound while finding block
> BP-233501496-*.*.*.*-1514185698256:blk_1620868560_547245090 on volume
> /media/disk5/hdfs/dn
> org.apache.hadoop.hdfs.server.datanode.ReplicaNotFoundException: Replica not
> found for BP-1997955181-*.*.*.*-1514186468560:blk_1090885868_17145082
> at
> org.apache.hadoop.hdfs.server.datanode.BlockSender.getReplica(BlockSender.java:471)
> at
> org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:240)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:553)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:148)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:103)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:254)
> at java.lang.Thread.run(Thread.java:748)
> ```
> I added some logs for confirmation, as follows:
> Log Code like:
> !image-2018-06-14-13-05-54-354.png!
> And the result is like:
> !image-2018-06-14-13-10-24-032.png!
> The Size of 'VolumeMap' has been reduced, and We found the 'VolumeMap' to be
> overridden by the new Disk Block by the method 'ReplicaMap.addAll(ReplicaMap
> other)'.
>
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