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HDFS-11864. Document Metrics to track usage of memory for writes. Contributed by Yiqun Lin.

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Brahma Reddy Battula 2017-05-23 23:52:42 +08:00
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hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
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@ -283,6 +283,21 @@ Each metrics record contains tags such as SessionId and Hostname as additional i
| `WritesFromLocalClient` | Total number of write operations from local client |
| `WritesFromRemoteClient` | Total number of write operations from remote client |
| `BlocksGetLocalPathInfo` | Total number of operations to get local path names of blocks |
| `RamDiskBlocksWrite` | Total number of blocks written to memory |
| `RamDiskBlocksWriteFallback` | Total number of blocks written to memory but not satisfied (failed-over to disk) |
| `RamDiskBytesWrite` | Total number of bytes written to memory |
| `RamDiskBlocksReadHits` | Total number of times a block in memory was read |
| `RamDiskBlocksEvicted` | Total number of blocks evicted in memory |
| `RamDiskBlocksEvictedWithoutRead` | Total number of blocks evicted in memory without ever being read from memory |
| `RamDiskBlocksEvictionWindowMsNumOps` | Number of blocks evicted in memory|
| `RamDiskBlocksEvictionWindowMsAvgTime` | Average time of blocks in memory before being evicted in milliseconds |
| `RamDiskBlocksEvictionWindows`*num*`s(50|75|90|95|99)thPercentileLatency` | The 50/75/90/95/99th percentile of latency between memory write and eviction in milliseconds. Percentile measurement is off by default, by watching no intervals. The intervals are specified by `dfs.metrics.percentiles.intervals`. |
| `RamDiskBlocksLazyPersisted` | Total number of blocks written to disk by lazy writer |
| `RamDiskBlocksDeletedBeforeLazyPersisted` | Total number of blocks deleted by application before being persisted to disk |
| `RamDiskBytesLazyPersisted` | Total number of bytes written to disk by lazy writer |
| `RamDiskBlocksLazyPersistWindowMsNumOps` | Number of blocks written to disk by lazy writer |
| `RamDiskBlocksLazyPersistWindowMsAvgTime` | Average time of blocks written to disk by lazy writer in milliseconds |
| `RamDiskBlocksLazyPersistWindows`*num*`s(50|75|90|95|99)thPercentileLatency` | The 50/75/90/95/99th percentile of latency between memory write and disk persist in milliseconds. Percentile measurement is off by default, by watching no intervals. The intervals are specified by `dfs.metrics.percentiles.intervals`. |
| `FsyncCount` | Total number of fsync |
| `VolumeFailures` | Total number of volume failures occurred |
| `ReadBlockOpNumOps` | Total number of read operations |