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https://issues.apache.org/jira/browse/HDFS-16917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17692386#comment-17692386
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ASF GitHub Bot commented on HDFS-16917:
---------------------------------------
rdingankar commented on code in PR #5397:
URL: https://github.com/apache/hadoop/pull/5397#discussion_r1115011334
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSUtil.java:
##########
@@ -1936,4 +1936,20 @@ public static boolean isParentEntry(final String path,
final String parent) {
return path.charAt(parent.length()) == Path.SEPARATOR_CHAR
|| parent.equals(Path.SEPARATOR);
}
+
+ /**
+ * Calculate the transfer rate in megabytes/second. Return -1 for any
negative input.
+ * @param bytes bytes
+ * @param durationMS duration in milliseconds
+ * @return the number of megabytes/second of the transfer rate
+ */
+ public static long transferRateMBs(long bytes, long durationMS) {
Review Comment:
Added unit tests
> 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
> Priority: Minor
> Labels: pull-request-available
>
> 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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