J.Andreina created HDFS-6753:
--------------------------------
Summary: 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
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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