[HDFS-11864] Document Metrics to track usage of memory for writes - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 2.9.0, 2.7.4, 3.0.0-alpha4, 2.8.2
Component/s: documentation
Labels:
None

Target Version/s:

2.7.4
Hadoop Flags:

Reviewed

Description

~~HDFS-7129~~ introduced followings metrics which are not documented.

	  // 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;