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https://issues.apache.org/jira/browse/HADOOP-5137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720233#action_12720233
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Steve Loughran commented on HADOOP-5137:
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Also block reports are fairly chatty too; every DN logs at the rate of the
heartbeat, which makes for a fairly noisy aggregate log.
It too could be split off to a child log.
> Move Datanode packet IO logging to its own log
> ----------------------------------------------
>
> Key: HADOOP-5137
> URL: https://issues.apache.org/jira/browse/HADOOP-5137
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.21.0
> Reporter: Steve Loughran
> Priority: Minor
>
> If the Datanode is set to log at info, then the log fills up with lots of
> details about packet sending and receiving
> [sf-startdaemon-debug] 09/01/28 13:15:42
> [org.apache.hadoop.hdfs.server.datanode.dataxcei...@83efe6e] INFO
> datanode.DataNode : Receiving block blk_-3185775405544105186_1757 src:
> /127.0.0.1:41218 dest: /127.0.0.1:48017
> [sf-startdaemon-debug] 09/01/28 13:15:42 [PacketResponder 0 for Block
> blk_-3185775405544105186_1757] INFO datanode.DataNode : Received block
> blk_-3185775405544105186_1757 of size 3647 from /127.0.0.1:41218
> [sf-startdaemon-debug] 09/01/28 13:15:42 [PacketResponder 0 for Block
> blk_-3185775405544105186_1757] INFO datanode.DataNode : PacketResponder 0 for
> block blk_-3185775405544105186_1757 terminating
> [sf-startdaemon-debug] 09/01/28 13:15:42
> [org.apache.hadoop.hdfs.server.datanode.dataxcei...@83f0029] INFO
> datanode.DataNode : Receiving block blk_-1511363731410268168_1758 src:
> /127.0.0.1:41219 dest: /127.0.0.1:48017
> [sf-startdaemon-debug] 09/01/28 13:15:42 [PacketResponder 0 for Block
> blk_-1511363731410268168_1758] INFO datanode.DataNode : Received block
> blk_-1511363731410268168_1758 of size 940 from /127.0.0.1:41219
> [sf-startdaemon-debug] 09/01/28 13:15:42 [PacketResponder 0 for Block
> blk_-1511363731410268168_1758] INFO datanode.DataNode : PacketResponder 0 for
> block blk_-1511363731410268168_1758 terminating
> [sf-startdaemon-debug] 09/01/28 13:15:42
> [org.apache.hadoop.hdfs.server.datanode.dataxcei...@83f01e4] INFO
> datanode.DataNode : Receiving block blk_-967265843864311176_1759 src:
> /127.0.0.1:41220 dest: /127.0.0.1:48017
> [sf-startdaemon-debug] 09/01/28 13:15:42 [PacketResponder 0 for Block
> blk_-967265843864311176_1759] INFO datanode.DataNode : Received block
> blk_-967265843864311176_1759 of size 36948 from /127.0.0.1:41220
> It would be convenient for those people who only want to see errors in
> communication but monitor other DataNode operations to have a separate logger
> for DataNode communications; one to view at a separate log level.
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