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https://issues.apache.org/jira/browse/HDFS-12934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16306560#comment-16306560
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Íñigo Goiri commented on HDFS-12934:
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* I've checked {{MountTableResolver}} and it might make sense to use a similar
{{TreeMap}} for the map in {{RouterQuotaLocalCache}}. It would simplify the
recursive search. I would go for a read/write lock or even better an atomic
update of the full map. Not sure
* In {{Router}}, I would rename {{getChildrenPaths(String path)}} into
{{getQuotaUsage(String path)}} and {{getQuotaUsageCache()}} {{getQuotaUsage()}}.
* Typo {{NamaService}} in {{RouterRpcServer}} and {{loc.getNameserviceId()}}
should be extracted.
* Update {{TestMountTable}} to include the new field for the quota.
* In {{TestRouterQuota}}, I think we shouldn't use the wait for breaking the
quota but actually create successfully the first 3 and then fail in the next
one.
* Do you mind opening the JIRA for the doc and the UI?
> 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: HDFS-12934.001.patch, HDFS-12934.002.patch,
> HDFS-12934.003.patch, 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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