[HDFS-6753] Initialize checkDisk when DirectoryScanner not able to get files list for scanning

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.7.0
• Hadoop Flags: Reviewed
• Assignee: J.Andreina
• Reporter: J.Andreina
• Created: 25/Jul/14 11:36
• Updated: 24/Apr/15 23:22
• Resolved: 27/Feb/15 11:10

Description

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)

 
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)
 

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

 
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)