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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3035) Data nodes should inform the name-node about block crc errors.
Date Tue, 18 Mar 2008 03:04:24 GMT
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


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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