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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5137) Move Datanode packet IO logging to its own log
Date Wed, 28 Jan 2009 13:25:59 GMT
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.DataXceiver@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.DataXceiver@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.DataXceiver@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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