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Date: Wed, 24 May 2017 02:18:04 +0000 (UTC)
From: "Brahma Reddy Battula (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13073850.1495457532000.278288.1495592284245@Atlassian.JIRA>
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References: <JIRA.13073850.1495457532000@Atlassian.JIRA> <JIRA.13073850.1495457532571@jira-lw-us.apache.org>
Subject: [jira] [Commented] (HDFS-11864) Document  Metrics to track usage of
 memory for writes
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archived-at: Wed, 24 May 2017 02:18:13 -0000


    [ https://issues.apache.org/jira/browse/HDFS-11864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022218#comment-16022218 ] 

Brahma Reddy Battula commented on HDFS-11864:
---------------------------------------------

Oh,Yes.. will cherry-pick to {{branch-2.8}}..thanks for reminding.

> Document  Metrics to track usage of memory for writes 
> ------------------------------------------------------
>
>                 Key: HDFS-11864
>                 URL: https://issues.apache.org/jira/browse/HDFS-11864
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: documentation
>            Reporter: Brahma Reddy Battula
>            Assignee: Yiqun Lin
>             Fix For: 2.9.0, 2.7.4, 3.0.0-alpha3, 2.8.1
>
>         Attachments: HDFS-11864.001.patch
>
>
> HDFS-7129 introduced followings metrics which are not documented.
> {noformat}
> 	  // RamDisk metrics on read/write
> 	  @Metric MutableCounterLong ramDiskBlocksWrite;
> 	  @Metric MutableCounterLong ramDiskBlocksWriteFallback;
> 	  @Metric MutableCounterLong ramDiskBytesWrite;
> 	  @Metric MutableCounterLong ramDiskBlocksReadHits;
> 	
> 	  // RamDisk metrics on eviction
> 	  @Metric MutableCounterLong ramDiskBlocksEvicted;
> 	  @Metric MutableCounterLong ramDiskBlocksEvictedWithoutRead;
> 	  @Metric MutableRate        ramDiskBlocksEvictionWindowMs;
> 	  final MutableQuantiles[]   ramDiskBlocksEvictionWindowMsQuantiles;
> 	
> 	
> 	  // RamDisk metrics on lazy persist
> 	  @Metric MutableCounterLong ramDiskBlocksLazyPersisted;
> 	  @Metric MutableCounterLong ramDiskBlocksDeletedBeforeLazyPersisted;
> 	  @Metric MutableCounterLong ramDiskBytesLazyPersisted;
> 	  @Metric MutableRate        ramDiskBlocksLazyPersistWindowMs;
> 	  final MutableQuantiles[]   ramDiskBlocksLazyPersistWindowMsQuantiles;
> {noformat}


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