HDFS-16319. Add metrics doc for ReadLockLongHoldCount and WriteLockLongHoldCount (#3653). Contributed by tomscut.
Signed-off-by: Ayush Saxena <ayushsaxena@apache.org>
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@ -285,6 +285,8 @@ Each metrics record contains tags such as HAState and Hostname as additional inf
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| `HAState` | (HA-only) Current state of the NameNode: initializing or active or standby or stopping state |
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| `FSState` | Current state of the file system: Safemode or Operational |
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| `LockQueueLength` | Number of threads waiting to acquire FSNameSystem lock |
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| `ReadLockLongHoldCount` | The number of time the read lock has been held for longer than the threshold |
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| `WriteLockLongHoldCount` | The number of time the write lock has been held for longer than the threshold |
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| `TotalSyncCount` | Total number of sync operations performed by edit log |
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| `TotalSyncTimes` | Total number of milliseconds spent by various edit logs in sync operation|
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| `NameDirSize` | NameNode name directories size in bytes |
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