captainzmc commented on a change in pull request #1736:
URL: https://github.com/apache/ozone/pull/1736#discussion_r549204685
##########
File path: hadoop-hdds/docs/content/feature/Quota.md
##########
@@ -73,10 +87,35 @@ This behavior changes the quota for Bucket1 to 10GB
Total bucket quota should not be greater than its Volume quota. If we have a
10MB Volume, The sum of the sizes of all buckets under this volume cannot
exceed 10MB, otherwise the bucket set quota fails.
+### Namespace quota
+Namespace quota is a number that represents how many unique names can be used.
This number cannot be greater than LONG.MAX_VALUE in Java.
+
+#### Volume Namespace quota
+```shell
+bin/ozone sh volume create --namespace-quota 100 /volume1
+```
+This means setting the namespace quota of Volume1 to 100.
+
+```shell
+bin/ozone sh volume setquota --namespace-quota 1000 /volume1
+```
+This behavior changes the namespace quota of Volume1 to 1000.
+
+#### Bucket Namespace quota
+```shell
+bin/ozone sh bucket create --namespace-quota 100 /volume1/bucket1
+```
+That means bucket1 allows us to use 100 of namespace.
+
+```shell
+bin/ozone sh bucket setquota --namespace-quota 1000 /volume1/bucket1
+```
+This behavior changes the quota for Bucket1 to 1000.
+
#### Clear the quota for volume and bucket
```shell
-bin/ozone sh volume clrquota --space-quota /volume1
-bin/ozone sh bucket clrquota --space-quota /volume1/bucket1
+bin/ozone sh volume clrquota --space-quota --namespace-quota /volume1
+bin/ozone sh bucket clrquota --space-quota --namespace-quota /volume1/bucket1
Review comment:
**There's something wrong with the directory structure. At present is:**
#space quota
……
#namespace quota
……
## clear quota
## check quota and usage
**We can change it to:**
#space quota
……
## clear quota
## check quota and usage
#namespace quota
……
## clear quota
## check quota and usage
**or**
#space quota and namespace quota
……
## clear quota
## check quota and usage
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