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https://issues.apache.org/jira/browse/HDFS-11864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16020952#comment-16020952
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Brahma Reddy Battula commented on HDFS-11864:
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bq.Brahma Reddy Battula, the trunk, branch-2 and branch-2.8 are also missing
these metrics in documenation, and should be updated, right? We would be better
not only fixed this in branch-2.7.
Yes, Need to update for all branches..
> 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
> 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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