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Posted to hdfs-issues@hadoop.apache.org by "HaiBin Huang (Jira)" <ji...@apache.org> on 2019/10/11 02:47:00 UTC
[jira] [Commented] (HDFS-14612) SlowDiskReport won't update when
SlowDisks is always empty in heartbeat
[ https://issues.apache.org/jira/browse/HDFS-14612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16949074#comment-16949074 ]
HaiBin Huang commented on HDFS-14612:
-------------------------------------
update patch v2, add a new test
> SlowDiskReport won't update when SlowDisks is always empty in heartbeat
> -----------------------------------------------------------------------
>
> Key: HDFS-14612
> URL: https://issues.apache.org/jira/browse/HDFS-14612
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: HaiBin Huang
> Assignee: HaiBin Huang
> Priority: Major
> Attachments: HDFS-14612-001.patch, HDFS-14612-002.patch, HDFS-14612.patch
>
>
> I found SlowDiskReport won't update when slowDisks is always empty in org.apache.hadoop.hdfs.server.blockmanagement.*handleHeartbeat*, this may lead to outdated SlowDiskReport alway staying in jmx of namenode until next time slowDisks isn't empty. So i think this method *checkAndUpdateReportIfNecessary()* should be called firstly when we want to get the jmx information about SlowDiskReport, this can keep the SlowDiskReport on jmx is alway valid.
>
> There is also some incorrect object reference on org.apache.hadoop.hdfs.server.datanode.fsdataset.
> *DataNodeVolumeMetrics*
> {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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