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https://issues.apache.org/jira/browse/HDFS-13443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16723884#comment-16723884
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Surendra Singh Lilhore commented on HDFS-13443:
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+1 for the patch
{quote}As [~arshad.mohammad] mentioned, we can track this in another JIRA. From
my opinion, I prefer to give a choice of sync-up behavior for users and disable
cache update by default.
{quote}
This patch is required in HDFS-14079. Lets discuss in HDFS-14079 more about
this.
> 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-13443-014.patch, HDFS-13443-015.patch, HDFS-13443-016.patch,
> HDFS-13443-017.patch, HDFS-13443-HDFS-13891-001.patch,
> HDFS-13443-HDFS-13891-002.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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