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https://issues.apache.org/jira/browse/HDFS-14813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16931063#comment-16931063
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Jinglun commented on HDFS-14813:
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My bad, I miss [~ayushtkn] comments in HDFS-14814. Let's discuss inherit quota
in HDFS-14814, I'll move my comments there.
> RBF: Make Global quota and Remote quota consistent.
> ---------------------------------------------------
>
> Key: HDFS-14813
> URL: https://issues.apache.org/jira/browse/HDFS-14813
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Jinglun
> Assignee: Jinglun
> Priority: Major
>
> Make Global quota and remote quota consistent.
> (Global quota: the quota on mount table, Remote quota: the quota on
> namespace)
> HDFS administrator can use global quota to simplify the management for
> federation paths. But there is no consistent constraint for the global quota
> and the remote quota. As an hdfs administrator the inconsistent has 3
> disadvantages on management:
> 1. The quota part of getQuotaUsage() on a federation path is not
> helpful. It's neither the global quota nor one of the remote quotas.
> 2. The global quota could be different with the remote quota. When a
> QuotaExceedException happens it needs the administrator to find out whether
> it's a violation of the global quota or the remote quota.
> 3. For management simplicity, it's always a good idea to keep the global
> quota and the remote quota the same. Now we need the administrator to keep
> the consistent manually.
> My proposal is to add a constraint for global quota:
> 1. For federation paths, global quota could be inherited from parent
> federation path.
> 2. For all remote paths in mount tables, the remote quotas must be
> consistent with the global quotas.
> To implement this, my idea is:
> 1. Global quota could be inherited. Add a method getGlobalQuota(String
> path) to Quota.java returning the global quota.
> 2. Each time RouterQuotaUpdateService updates the quota usage for mount
> table entries, it also checks and updates the remote quota.
> 3. When getQuotaUsage() on a federation path, return the global quota.
> 4. When setQuota() on a federation path, first update the global quota
> in mount table, then recompute global quota for the current path and its
> children paths, finally update all the federation paths.
>
> Implement 1+2 in HDFS-14814
> Implement 4 in HDFS-14815
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