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https://issues.apache.org/jira/browse/HDFS-16917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17782078#comment-17782078
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ASF GitHub Bot commented on HDFS-16917:
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tomasbanet commented on PR #5397:
URL: https://github.com/apache/hadoop/pull/5397#issuecomment-1790377755
@rdingankar after updating our cluster to hadoop 3.3.4, we are now seeing
`WARN hdfs.DFSUtil: Unexpected value for data transfer bytes=XXXX duration=0`
every minute in all the datanode logs, where XXXX ranges from ~4-5 kb to a max
of ~200 kb.
> Add transfer rate quantile metrics for DataNode reads
> -----------------------------------------------------
>
> Key: HDFS-16917
> URL: https://issues.apache.org/jira/browse/HDFS-16917
> Project: Hadoop HDFS
> Issue Type: Task
> Components: datanode
> Reporter: Ravindra Dingankar
> Assignee: Ravindra Dingankar
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.3.0, 3.4.0
>
>
> Currently we have the following metrics for datanode reads.
> |BytesRead
> BlocksRead
> TotalReadTime|Total number of bytes read from DataNode
> Total number of blocks read from DataNode
> Total number of milliseconds spent on read operation|
> We would like to add a new quantile metric calculating the transfer rate for
> datanode reads.
> This will give us a distribution across a window of the read transfer rate
> for each datanode.
> Quantiles for transfer rate per host will help in identifying issues like
> hotspotting of datasets as well as finding repetitive slow datanodes.
>
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