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https://issues.apache.org/jira/browse/HDFS-11864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022205#comment-16022205
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Yiqun Lin commented on HDFS-11864:
----------------------------------
Thanks [~brahmareddy] for the review and commit. Why not merge this into
branch-2.8 and add 2.8.2 into fix version? The versions 2.8.x will be fixed
this issue after merging into branch-2.8.
> 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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