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https://issues.apache.org/jira/browse/HDFS-15155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17047171#comment-17047171
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Haibin Huang edited comment on HDFS-15155 at 2/28/20 3:05 AM:
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[~elgoiri] ,thanks for reviewing this patch, i think
TestDataNodeVolumeMetrics#testVolumeMetrics has checked the metrics of writIo,
and it need to remove this line before building the MiniDFSCluster:
{code:java}
SimulatedFSDataset.setFactory(conf);
{code}
and you will see the different in
TestDataNodeVolumeMetrics#verifyDataNodeVolumeMetrics after applying this
patch, you can focus on these output line:
{code:java}
LOG.info("writeIoSampleCount : " + metrics.getWriteIoSampleCount());
LOG.info("writeIoMean : " + metrics.getWriteIoMean());
LOG.info("writeIoStdDev : " + metrics.getWriteIoStdDev());
{code}
if need some more asserts, i will update soon
was (Author: huanghaibin):
I think TestDataNodeVolumeMetrics#testVolumeMetrics has checked the metrics of
writIo, and it need to remove this line before building the MiniDFSCluster:
{code:java}
SimulatedFSDataset.setFactory(conf);
{code}
and you will see the different in
TestDataNodeVolumeMetrics#verifyDataNodeVolumeMetrics after applying this
patch, you can focus on these output line:
{code:java}
LOG.info("writeIoSampleCount : " + metrics.getWriteIoSampleCount());
LOG.info("writeIoMean : " + metrics.getWriteIoMean());
LOG.info("writeIoStdDev : " + metrics.getWriteIoStdDev());
{code}
if need some more asserts, i will update soon, thanks for reviewing
> writeIoRate of DataNodeVolumeMetrics is never used
> --------------------------------------------------
>
> Key: HDFS-15155
> URL: https://issues.apache.org/jira/browse/HDFS-15155
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Reporter: Haibin Huang
> Assignee: Haibin Huang
> Priority: Major
> Attachments: HDFS-15155.001.patch, HDFS-15155.002.patch
>
>
> There is some incorrect object using in DataNodeVolumeMetrics, writeIoRate is
> never used and syncIoRate should be replaced by writeIoRate in the following
> code:
> {code:java}
> // Based on writeIoRate
> public long getWriteIoSampleCount() {
> return syncIoRate.lastStat().numSamples();
> }
> public double getWriteIoMean() {
> return syncIoRate.lastStat().mean();
> }
> public double getWriteIoStdDev() {
> return syncIoRate.lastStat().stddev();
> }
> {code}
>
>
>
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