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https://issues.apache.org/jira/browse/HDFS-12934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16299431#comment-16299431
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Yiqun Lin commented on HDFS-12934:
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Thanks for taking the look of the design doc, [~elgoiri].
bq. I think we should have flags to enable the quota system at the Router level
Good idea. Agree on this. And quota system should be disabled by default.
{quote}
I guess we also want to implement the setQuotaSpace().
{quote}
The API {{ClientProtocol#setQuota(String path, long namespaceQuota, long
storagespaceQuota, StorageType type)}} can set space quota. If we don't want to
set namespaceQuota, we can pass an unset flag like
{{HdfsConstants.QUOTA_DONT_SET}}.
bq. I didn't get what you meant about ClientProtocol#getQuota(); will we
implement it or not?
I am thinking of this again. This should be implemented. We can use this API to
get quota usage of given path. In my initial design doc, I plan to create new
RouterRPCClient for making the RPC call. But actually we can implement this in
RouterRpcServer and reuse this API.
i will attach a new doc for updating the content you pointed out. Now I think
we almostly reach an agreement for quota supporting in RBF. I will start for
working on this right now. Thanks for discussions, everyone, :).
> RBF: Federation supports global quota
> -------------------------------------
>
> Key: HDFS-12934
> URL: https://issues.apache.org/jira/browse/HDFS-12934
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 3.0.0
> Reporter: Yiqun Lin
> Assignee: Yiqun Lin
> Labels: RBF
> Attachments: RBF support global quota.pdf
>
>
> Now federation doesn't support set the global quota for each folder.
> Currently the quota will be applied for each subcluster under the specified
> folder via RPC call.
> It will be very useful for users that federation can support setting global
> quota and exposing the command of this.
> In a federated environment, a folder can be spread across multiple
> subclusters. For this reason, we plan to solve this by following way:
> # Set global quota across each subcluster. We don't allow each subcluster can
> exceed maximun quota value.
> # We need to construct one <Path, QuotaUsage> cache map for storing the sum
> quota usage of these subclusters under federation folder. Every time we want
> to do WRITE operation under specified folder, we will get its quota usage
> from cache and verify its quota. If quota exceeded, throw exception,
> otherwise update its quota usage in cache when finishing operations.
> The quota will be set to mount table and as a new field in mount table. The
> set/unset command will be like:
> {noformat}
> hdfs dfsrouteradmin -setQuota -ns <nsQuota> -ss <ssQuota> <mount table>
> hdfs dfsrouteradmin -clrQuota <mount table>
> {noformat}
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