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From "lohit vijayarenu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3035) Data nodes should inform the name-node about block crc errors.
Date Wed, 21 May 2008 19:55:55 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3035?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

lohit vijayarenu updated HADOOP-3035:
-------------------------------------

    Status: Open  (was: Patch Available)

> Data nodes should inform the name-node about block crc errors.
> --------------------------------------------------------------
>
>                 Key: HADOOP-3035
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3035
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Konstantin Shvachko
>            Assignee: lohit vijayarenu
>         Attachments: HADOOP-3035-1.patch, HADOOP-3035-2.patch
>
>
> Currently if a crc error occurs when data-node replicates a block to another node it
throws an exception, and continues.
> {code}
>     [junit] 2008-03-17 19:46:11,855 INFO  dfs.DataNode (DataNode.java:transferBlocks(811))
- 127.0.0.1:3730 Starting thread to transfer block blk_-1962819020391742554 to 127.0.0.1:3740
>     [junit] 2008-03-17 19:46:11,855 INFO  dfs.DataNode (DataNode.java:writeBlock(1067))
- Receiving block blk_-1962819020391742554 src: /127.0.0.1:3791 dest: /127.0.0.1:3740
>     [junit] 2008-03-17 19:46:11,855 INFO  dfs.DataNode (DataNode.java:receiveBlock(2504))
- Exception in receiveBlock for block blk_-1962819020391742554 java.io.IOException: Unexpected
checksum mismatch while writing blk_-1962819020391742554 from /127.0.0.1
>     [junit] 2008-03-17 19:46:11,871 INFO  dfs.DataNode (DataNode.java:run(2626)) - 127.0.0.1:3730:Transmitted
block blk_-1962819020391742554 to /127.0.0.1:3740
>     [junit] 2008-03-17 19:46:11,871 INFO  dfs.DataNode (DataNode.java:writeBlock(1192))
- writeBlock blk_-1962819020391742554 received exception java.io.IOException: Unexpected checksum
mismatch while writing blk_-1962819020391742554 from /127.0.0.1
>     [junit] 2008-03-17 19:46:11,871 ERROR dfs.DataNode (DataNode.java:run(979)) - 127.0.0.1:3740:DataXceiver:
java.io.IOException: Unexpected checksum mismatch while writing blk_-1962819020391742554 from
/127.0.0.1
>     [junit]     at org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveChunk(DataNode.java:2246)
>     [junit]     at org.apache.hadoop.dfs.DataNode$BlockReceiver.receivePacket(DataNode.java:2416)
>     [junit]     at org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveBlock(DataNode.java:2474)
>     [junit]     at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:1173)
>     [junit]     at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:956)
>     [junit]     at java.lang.Thread.run(Thread.java:595)
> {code}
> The data-node should report the error to the name-node so that the corrupted replica
could be removed and replicated.

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