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https://issues.apache.org/jira/browse/HDFS-12861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16269150#comment-16269150
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Íñigo Goiri commented on HDFS-12861:
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The read path is pretty straightforward (other than hedging). For the writes,
we need to track the time of sending the request and getting the ACK and then
take into account the overlapping between the badges (it may send 64 packets to
write in parallel).
> Track speed in DFSClient
> ------------------------
>
> Key: HDFS-12861
> URL: https://issues.apache.org/jira/browse/HDFS-12861
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Íñigo Goiri
>
> Sometimes we get slow jobs because of the access to HDFS. However, is hard to
> tell what is the actual speed. We propose to add a log line with something
> like:
> {code}
> 2017-11-19 09:55:26,309 INFO [main] hdfs.DFSClient: blk_1107222019_38144502
> READ 129500B in 7ms 17.6MB/s
> 2017-11-27 19:01:04,141 INFO [DataStreamer for file
> /hdfs-federation/stats/2017/11/27/1511838000000.json] hdfs.DFSClient:
> blk_1135792057_86833357 WRITE 131072B in 10ms 12.5MB/s
> 2017-11-27 19:01:14,219 INFO [DataStreamer for file
> /hdfs-federation/stats/2017/11/27/1511838000000.json] hdfs.DFSClient:
> blk_1135792069_86833369 WRITE 131072B in 12ms 10.4MB/s
> 2017-11-27 19:01:24,282 INFO [DataStreamer for file
> /hdfs-federation/stats/2017/11/27/1511838000000.json] hdfs.DFSClient:
> blk_1135792081_86833381 WRITE 131072B in 11ms 11.4MB/s
> 2017-11-27 19:01:34,330 INFO [DataStreamer for file
> /hdfs-federation/stats/2017/11/27/1511838000000.json] hdfs.DFSClient:
> blk_1135792093_86833393 WRITE 131072B in 11ms 11.4MB/s
> 2017-11-27 19:01:44,408 INFO [DataStreamer for file
> /hdfs-federation/stats/2017/11/27/1511838000000.json] hdfs.DFSClient:
> blk_1135792105_86833405 WRITE 131072B in 11ms 11.4MB/s
> {code}
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