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https://issues.apache.org/jira/browse/HDFS-693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12886090#action_12886090
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Cody Saunders commented on HDFS-693:
------------------------------------
Followup, even though I set TZ, I still get 480s timeouts in datanodes. Here's
a sample, where it appears only 3ms actually pass before it complains:
2010-07-07 13:56:57,865 INFO
org.apache.hadoop.hdfs.server.datanode.DataNode.clienttrace: src:
/192.168.200.207:50010, dest: /192.168.200.207:44915, bytes: 264192, op:
HDFS_READ, cliID: DFSClient_1293902555, srvID:
DS-7579347-192.168.200.207-50010-1278476587314, blockid:
blk_-3262154426456719253_1840
2010-07-07 13:56:57,868 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
DatanodeRegistration(192.168.200.207:50010,
storageID=DS-7579347-192.168.200.207-50010-1278476587314, infoPort=50075,
ipcPort=50020):Got exception while serving blk_-3262154426456719253_1840 to
/192.168.200.207:
java.net.SocketTimeoutException: 480000 millis timeout while waiting for
channel to be ready for write. ch : java.nio.channels.SocketChannel[connected
local=/192.168.200.207:50010 remote=/192.168.200.207:44915]
at
org.apache.hadoop.net.SocketIOWithTimeout.waitForIO(SocketIOWithTimeout.java:246)
at
org.apache.hadoop.net.SocketOutputStream.waitForWritable(SocketOutputStream.java:159)
at
org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:198)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendChunks(BlockSender.java:313)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:400)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:180)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:95)
at java.lang.Thread.run(Thread.java:619)
I am using hadoop 0.20.2 and hbase 0.20.4.
> java.net.SocketTimeoutException: 480000 millis timeout while waiting for
> channel to be ready for write exceptions were cast when trying to read file
> via StreamFile.
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-693
> URL: https://issues.apache.org/jira/browse/HDFS-693
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 0.20.1
> Reporter: Yajun Dong
> Attachments: HDFS-693.log
>
>
> To exclude the case of network problem, I found the count of dataXceiver is
> about 30. Also, I could see the output of netstate -a | grep 50075 has many
> TIME_WAIT status when this happened.
> partial log in attachment.
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