xuzq created HDFS-13677:
---------------------------
Summary: 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
Affects Versions: 3.0.0, 2.6.0
Reporter: xuzq
Attachments: 0001-fix-the-bug-of-the-refresh-disk-configuration.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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