[jira] [Work started] (HDFS-14761) RBF: MountTableResolver cannot invalidate cache correctly

["Yuxuan Wang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-14761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HDFS-14761 started by Yuxuan Wang.
------------------------------------------
> RBF: MountTableResolver cannot invalidate cache correctly
> ---------------------------------------------------------
>
>                 Key: HDFS-14761
>                 URL: https://issues.apache.org/jira/browse/HDFS-14761
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: rbf
>            Reporter: Yuxuan Wang
>            Assignee: Yuxuan Wang
>            Priority: Major
>              Labels: RBF
>         Attachments: draft-reproduce-patch-HDFS-14761.patch
>
>
> STEPS TO REPRODUCE:
> add mount table entry 1->/
> mountTable.getDestinationForPath("/foo/a") will return "1->/foo/a", that's correct
> add mount table entry 2->/foo
> mountTable.getDestinationForPath("/foo/a") should return "2->/foo/a", but it still return "1->/foo/a"
> WHY:
> {code:title=MountTableResolver.java|borderStyle=solid}
> private void invalidateLocationCache(...)
> {
>     ...
>     String src = loc.getSourcePath();
>     if (src != null) {
>         if (isParentEntry(src, path)) {
>           LOG.debug("Removing {}", src);
>           it.remove();
>         }
>     }
>     ...
> }
> {code}
> *path* is the new entry, in our case is "/foo"
> But *src* is the mount point path, in our case is "/", which isn't child of "/foo"
> So, it can't invalidate the cache entry.
> HOW TO FIX:
> Just reverse the parameters of *isParentEntry* .
> PS:
> *PathLocation#getSourcePath()* will return *PathLocation#sourcePath*, which attached a comment about "Source path in global namespace.". But I think the field indeed denotes the mount point path after I review the code. I think it's confused.



--
This message was sent by Atlassian Jira
(v8.3.2#803003)

---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-help@hadoop.apache.org