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https://issues.apache.org/jira/browse/HDFS-14814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16935506#comment-16935506
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Jinglun commented on HDFS-14814:
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Hi [~ayushtkn], your understand is right, the 1,2,3 idea is exactly what I
mean.
In this jira, I intend to let RouterQuotaUpdateService fix all the bad quotas.
If I want to fix quota, I must know what is the right quota. So I use the
*inherited rule* to determine whether a quota is correct or not.
To implement the inherited rule, we need to update all rpcs related to global
quota, including RouterAdmin updates mount tables,
RouterRpcServer.getQuotaUsage(), RouterRpcServer.setQuota() and
RouterQuotaUpdateService fixing. I don't want to add all the changes in one big
patch so I want to start with RouterQuotaUpdateService.
RouterQuotaUpdateService can be seen as the final judge. It will always make
everything right. So I want to start with it.
> RBF: The quota should be set the same as the nearest parent in Global Quota.
> ----------------------------------------------------------------------------
>
> Key: HDFS-14814
> URL: https://issues.apache.org/jira/browse/HDFS-14814
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Jinglun
> Assignee: Jinglun
> Priority: Major
> Attachments: HDFS-14814.001.patch, HDFS-14814.002.patch,
> HDFS-14814.003.patch
>
>
> I want to add a rule *'The quota should be set the same as the nearest
> parent'* to Global Quota. Supposing we have the mount table below.
> M1: /dir-a ns0->/dir-a \{nquota=10,squota=20}
> M2: /dir-a/dir-b ns1->/dir-b \{nquota=-1,squota=30}
> M3: /dir-a/dir-b/dir-c ns2->/dir-c \{nquota=-1,squota=-1}
> M4: /dir-d ns3->/dir-d \{nquota=-1,squota=-1}
>
> The quota for the remote locations on the namespaces should be:
> ns0->/dir-a \{nquota=10,squota=20}
> ns1->/dir-b \{nquota=10,squota=30}
> ns2->/dir-c \{nquota=10,squota=30}
> ns3->/dir-d \{nquota=-1,squota=-1}
>
> The quota of the remote location is set the same as the corresponding
> MountTable, and if there is no quota of the MountTable then the quota is set
> to the nearest parent MountTable with quota.
>
> It's easy to implement it. In RouterQuotaUpdateService each time we compute
> the currentQuotaUsage, we can get the quota info for each MountTable. We can
> do a
> check and fix all the MountTable which's quota doesn't match the rule above.
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