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Date: Mon, 7 Jul 2008 10:22:31 -0700 (PDT)
From: "Koji Noguchi (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Created: (HADOOP-3707) Frequent DiskOutOfSpaceException on
 almost-full datanodes
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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


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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