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https://issues.apache.org/jira/browse/HDFS-13443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16707747#comment-16707747
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Íñigo Goiri commented on HDFS-13443:
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Thanks [~arshad.mohammad] for [^HDFS-13443-013.patch].
* {{assertTrue("No RouterClient is created.", counter.getCreateCount() !=
0);}}, could use {{assertNotEquals}}.
* For {{testRouterClientConnectionExpiration}}, instead of waiting a fix
period, we should do a {{GenericTestUtils#waitFor}}.
* {{getCount()}} should be something like {{getNumMountTableEntries()}}.
* {{getMountTable()}} should be {{getMountTableEntry()}}.
* {{testMountTableEntriesCacheUpdateTimeout()}} is a little long, can we make
it timeout earlier?
* Do we need {{CreateRemoveCounter}}, having the two integers seem enough;
porbably just make the {{AtomicInteger}}.
> RBF: Update mount table cache immediately after changing (add/update/remove)
> mount table entries.
> -------------------------------------------------------------------------------------------------
>
> Key: HDFS-13443
> URL: https://issues.apache.org/jira/browse/HDFS-13443
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: fs
> Reporter: Mohammad Arshad
> Assignee: Mohammad Arshad
> Priority: Major
> Labels: RBF
> Attachments: HDFS-13443-012.patch, HDFS-13443-013.patch,
> HDFS-13443-branch-2.001.patch, HDFS-13443-branch-2.002.patch,
> HDFS-13443.001.patch, HDFS-13443.002.patch, HDFS-13443.003.patch,
> HDFS-13443.004.patch, HDFS-13443.005.patch, HDFS-13443.006.patch,
> HDFS-13443.007.patch, HDFS-13443.008.patch, HDFS-13443.009.patch,
> HDFS-13443.010.patch, HDFS-13443.011.patch
>
>
> Currently mount table cache is updated periodically, by default cache is
> updated every minute. After change in mount table, user operations may still
> use old mount table. This is bit wrong.
> To update mount table cache, maybe we can do following
> * *Add refresh API in MountTableManager which will update mount table cache.*
> * *When there is a change in mount table entries, router admin server can
> update its cache and ask other routers to update their cache*. For example if
> there are three routers R1,R2,R3 in a cluster then add mount table entry API,
> at admin server side, will perform following sequence of action
> ## user submit add mount table entry request on R1
> ## R1 adds the mount table entry in state store
> ## R1 call refresh API on R2
> ## R1 calls refresh API on R3
> ## R1 directly freshest its cache
> ## Add mount table entry response send back to user.
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