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Posted to common-dev@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2008/08/30 00:23:44 UTC
[jira] Commented: (HADOOP-3831) slow-reading dfs clients do not
recover from datanode-write-timeouts
[ https://issues.apache.org/jira/browse/HADOOP-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627130#action_12627130 ]
Hairong Kuang commented on HADOOP-3831:
---------------------------------------
A few comments:
1. Is it true that seekToBlockSource always return true?
2. Is it better that seekToBlockSource returns the new node?
3. Should retryCurrentNode set to be true if seekToBlock seeks to a new node?
4. it seems that the code on lines 1485-1495 can be simplified as follows:
if (!retryCurrentNode) addToDeadNodes(currentNode);
seekToNewSource(pos);
> slow-reading dfs clients do not recover from datanode-write-timeouts
> --------------------------------------------------------------------
>
> Key: HADOOP-3831
> URL: https://issues.apache.org/jira/browse/HADOOP-3831
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.17.1
> Reporter: Christian Kunz
> Assignee: Raghu Angadi
> Attachments: HADOOP-3831.patch, HADOOP-3831.patch, HADOOP-3831.patch
>
>
> Some of our applications read through certain files from dfs (using libhdfs) much slower than through others, such that they trigger the write timeout introduced in 0.17.x into the datanodes. Eventually they fail.
> Dfs clients should be able to recover from such a situation.
> In the meantime, would setting
> dfs.datanode.socket.write.timeout=0
> in hadoop-site.xml help?
> Here are the exceptions I see:
> DataNode:
> 2008-07-24 00:12:40,167 WARN org.apache.hadoop.dfs.DataNode: xxx:50010:Got exception while serving blk_3304550638094049
> 753 to /yyy:
> java.net.SocketTimeoutException: 480000 millis timeout while waiting for channel to be ready for write. ch : java.nio.channels.
> SocketChannel[connected local=/xxx:50010 remote=/yyy:42542]
> at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:170)
> at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:144)
> at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:105)
> at java.io.BufferedOutputStream.write(BufferedOutputStream.java:105)
> at java.io.DataOutputStream.write(DataOutputStream.java:90)
> at org.apache.hadoop.dfs.DataNode$BlockSender.sendChunks(DataNode.java:1774)
> at org.apache.hadoop.dfs.DataNode$BlockSender.sendBlock(DataNode.java:1813)
> at org.apache.hadoop.dfs.DataNode$DataXceiver.readBlock(DataNode.java:1039)
> at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:968)
> at java.lang.Thread.run(Thread.java:619)
> DFS Client:
> 08/07/24 00:13:28 WARN dfs.DFSClient: Exception while reading from blk_3304550638094049753 of zzz from xxx:50010: java.io.IOException: Premeture EOF from inputStream
> at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:100)
> at org.apache.hadoop.dfs.DFSClient$BlockReader.readChunk(DFSClient.java:967)
> at org.apache.hadoop.fs.FSInputChecker.readChecksumChunk(FSInputChecker.java:236)
> at org.apache.hadoop.fs.FSInputChecker.read1(FSInputChecker.java:191)
> at org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java:159)
> at org.apache.hadoop.dfs.DFSClient$BlockReader.read(DFSClient.java:829)
> at org.apache.hadoop.dfs.DFSClient$DFSInputStream.readBuffer(DFSClient.java:1352)
> at org.apache.hadoop.dfs.DFSClient$DFSInputStream.read(DFSClient.java:1388)
> at java.io.DataInputStream.read(DataInputStream.java:83)
> 08/07/24 00:13:28 INFO dfs.DFSClient: Could not obtain block blk_3304550638094049753 from any node: java.io.IOException: No live nodes contain current block
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