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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11864) Document Metrics to track usage of memory for writes
Date Mon, 22 May 2017 12:53:04 GMT
Brahma Reddy Battula created HDFS-11864:
-------------------------------------------

             Summary: 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


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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