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https://issues.apache.org/jira/browse/HDFS-6753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vinayakumar B updated HDFS-6753:
--------------------------------
Assignee: J.Andreina (was: Srikanth Upputuri)
Status: Patch Available (was: Open)
> When one the Disk is full and all the volumes configured are unhealthy , then
> Datanode is not considering it as failure and datanode process is not
> shutting down .
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-6753
> URL: https://issues.apache.org/jira/browse/HDFS-6753
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: J.Andreina
> Assignee: J.Andreina
> Attachments: HDFS-6753.1.patch
>
>
> Env Details :
> =============
> Cluster has 3 Datanode
> Cluster installed with "Rex" user
> dfs.datanode.failed.volumes.tolerated = 3
> dfs.blockreport.intervalMsec = 18000
> dfs.datanode.directoryscan.interval = 120
> DN_XX1.XX1.XX1.XX1 data dir =
> /mnt/tmp_Datanode,/home/REX/data/dfs1/data,/home/REX/data/dfs2/data,/opt/REX/dfs/data
>
>
> /home/REX/data/dfs1/data,/home/REX/data/dfs2/data,/opt/REX/dfs/data -
> permission is denied ( hence DN considered the volume as failed )
>
> Expected behavior is observed when disk is not full:
> ========================================
>
> Step 1: Change the permissions of /mnt/tmp_Datanode to root
>
> Step 2: Perform write operations ( DN detects that all Volume configured is
> failed and gets shutdown )
>
> Scenario 1:
> ===========
>
> Step 1 : Make /mnt/tmp_Datanode disk full and change the permissions to root
> Step 2 : Perform client write operations ( disk full exception is thrown ,
> but Datanode is not getting shutdown , eventhough all the volume configured
> has failed)
>
> {noformat}
>
> 2014-07-21 14:10:52,814 ERROR
> org.apache.hadoop.hdfs.server.datanode.DataNode:
> XX1.XX1.XX1.XX1:50010:DataXceiver error processing WRITE_BLOCK operation
> src: /XX2.XX2.XX2.XX2:10106 dst: /XX1.XX1.XX1.XX1:50010
>
> org.apache.hadoop.util.DiskChecker$DiskOutOfSpaceException: Out of space: The
> volume with the most available space (=4096 B) is less than the block size
> (=134217728 B).
>
> at
> org.apache.hadoop.hdfs.server.datanode.fsdataset.RoundRobinVolumeChoosingPolicy.chooseVolume(RoundRobinVolumeChoosingPolicy.java:60)
>
> {noformat}
>
> Observations :
> ==============
> 1. Write operations does not shutdown Datanode , eventhough all the volume
> configured is failed ( When one of the disk is full and for all the disk
> permission is denied)
>
> 2. Directory scannning fails , still DN is not getting shutdown
>
>
>
> {noformat}
>
> 2014-07-21 14:13:00,180 WARN
> org.apache.hadoop.hdfs.server.datanode.DirectoryScanner: Exception occured
> while compiling report:
>
> java.io.IOException: Invalid directory or I/O error occurred for dir:
> /mnt/tmp_Datanode/current/BP-1384489961-XX2.XX2.XX2.XX2-845784615183/current/finalized
>
> at org.apache.hadoop.fs.FileUtil.listFiles(FileUtil.java:1164)
>
> at
> org.apache.hadoop.hdfs.server.datanode.DirectoryScanner$ReportCompiler.compileReport(DirectoryScanner.java:596)
>
> {noformat}
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