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  1. Hadoop HDFS
  2. HDFS-11864

Document Metrics to track usage of memory for writes

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    • Target Version/s:
    • Hadoop Flags:
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      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;
      

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              • Assignee:
                linyiqun Yiqun Lin
                Reporter:
                brahmareddy Brahma Reddy Battula
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