Data nodes should inform the name-node about block crc errors.
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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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