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HDFS-11983. Ozone: Add documentation for metrics in KSMMetrics to OzoneMetrics.md. Contributed by Yiqun Lin.

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Yiqun Lin 2017-06-21 10:27:01 +08:00 committed by Owen O'Malley
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@ -87,3 +87,42 @@ RPC operations.
| `GetSmallFile` | Get small file operations |
| `CloseContainer` | Close container operations |
### Key Space Metrics
The metrics for various key space manager operations in HDFS Ozone.
key space manager (KSM) is a service that similar to the Namenode in HDFS.
In the current design of KSM, it maintains metadata of all volumes, buckets and keys.
These metrics are only available when ozone is enabled.
Following is the set of counters maintained for each key space operation.
*Total number of operation* - We maintain an array which counts how
many times a specific operation has been performed.
Eg.`NumVolumeCreate` tells us how many times create volume has been
invoked in KSM.
*Total number of failed operation* - This type operation is opposite to the above
operation.
Eg.`NumVolumeCreateFails` tells us how many times create volume has been invoked
failed in KSM.
Following are the counters for each of key space operations.
| Name | Description |
|:---- |:---- |
| `VolumeCreate` | Create volume operation |
| `VolumeUpdates` | Update volume property operation |
| `VolumeInfos` | Get volume information operation |
| `VolumeCheckAccesses` | Check volume access operation |
| `VolumeDeletes` | Delete volume operation |
| `VolumeLists` | List volume operation |
| `BucketCreates` | Create bucket operation |
| `BucketInfos` | Get bucket information operation |
| `BucketUpdates` | Update bucket property operation |
| `BucketDeletes` | Delete bucket operation |
| `BucketLists` | List bucket operation |
| `KeyAllocate` | Allocate key operation |
| `KeyLookup` | Look up key operation |
| `KeyDeletes` | Delete key operation |
| `KeyLists` | List key operation |