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Date: Wed, 9 Jul 2008 14:47:31 -0700 (PDT)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3707) Frequent DiskOutOfSpaceException on
 almost-full datanodes
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    [ https://issues.apache.org/jira/browse/HADOOP-3707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612296#action_12612296 ] 

Hairong Kuang commented on HADOOP-3707:
---------------------------------------

Raghu, could you please upload a patch for the trunk?

> Frequent DiskOutOfSpaceException on almost-full datanodes
> ---------------------------------------------------------
>
>                 Key: HADOOP-3707
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3707
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.17.0
>            Reporter: Koji Noguchi
>            Assignee: Raghu Angadi
>            Priority: Blocker
>             Fix For: 0.17.2, 0.18.0, 0.19.0
>
>         Attachments: HADOOP-3707-branch-017.patch, HADOOP-3707-branch-017.patch
>
>
> On a datanode which is completely full (leaving reserve space),  we frequently see
> target node reporting, 
> {noformat}
> 2008-07-07 16:54:44,707 INFO org.apache.hadoop.dfs.DataNode: Receiving block blk_3328886742742952100 src: /11.1.11.111:22222 dest: /11.1.11.111:22222
> 2008-07-07 16:54:44,708 INFO org.apache.hadoop.dfs.DataNode: writeBlock blk_3328886742742952100 received exception org.apache.hadoop.util.DiskChecker$DiskOutOfSpaceException: Insufficient space for an additional block
> 2008-07-07 16:54:44,708 ERROR org.apache.hadoop.dfs.DataNode: 33.3.33.33:22222:DataXceiver: org.apache.hadoop.util.DiskChecker$DiskOutOfSpaceException: Insufficient space for an additional block
>         at org.apache.hadoop.dfs.FSDataset$FSVolumeSet.getNextVolume(FSDataset.java:444)
>         at org.apache.hadoop.dfs.FSDataset.writeToBlock(FSDataset.java:716)
>         at org.apache.hadoop.dfs.DataNode$BlockReceiver.<init>(DataNode.java:2187)
>         at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:1113)
>         at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:976)
>         at java.lang.Thread.run(Thread.java:619)
> {noformat}
> Sender reporting 
> {noformat}
> 2008-07-07 16:54:44,712 INFO org.apache.hadoop.dfs.DataNode: 11.1.11.111:22222:Exception writing block blk_3328886742742952100 to mirror 33.3.33.33:22222
> java.io.IOException: Broken pipe
>         at sun.nio.ch.FileDispatcher.write0(Native Method)
>         at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:29)
>         at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:104)
>         at sun.nio.ch.IOUtil.write(IOUtil.java:75)
>         at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:334)
>         at org.apache.hadoop.net.SocketOutputStream$Writer.performIO(SocketOutputStream.java:53)
>         at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:140)
>         at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:144)
>         at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:105)
>         at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
>         at java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
>         at java.io.DataOutputStream.write(DataOutputStream.java:90)
>         at org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveChunk(DataNode.java:2292)
>         at org.apache.hadoop.dfs.DataNode$BlockReceiver.receivePacket(DataNode.java:2411)
>         at org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveBlock(DataNode.java:2476)
>         at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:1204)
>         at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:976)
>         at java.lang.Thread.run(Thread.java:619)
> {noformat}
> Since it's not constantly happening,  my guess is whenever datanode gets some small space available, namenode over-assigns blocks which can fail the block
> pipeline.
> (Note, before 0.17, namenode was much slower in assigning blocks)

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