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https://issues.apache.org/jira/browse/HDFS-13045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426165#comment-16426165
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Wei Yan commented on HDFS-13045:
--------------------------------
{quote}bq.I went with your first proposal there; I had to remember the original
path but that's fairly simple (didn't check super carefully if there was
another place with the original path though).
{quote}
Recording the orginal path is a very good idea. One tracky here is, if the
destination contains repeated destination paths, the replacement will replace
all destination paths. For example, mount point "/ns1/a" maps "/a" in ns1, and
the error message like "...../a/a/b...", the replacement will replace both "/a".
BTW, could u explain more about the following code... get confused here.
{code:java}
while (newMsg.equals(msg) && i < dst.length() && i < src.length()) {
// Check if we can replace sub folders
char dstChar = dst.charAt(dst.length() - 1 - i);
char srcChar = src.charAt(src.length() - 1 - i);
if (dstChar == srcChar && dstChar != '/') {
i++;
} else {
String dst1 = dst.substring(0, dst.length() - 1 - i);
String src1 = src.substring(0, src.length() - 1 - i);
newMsg = msg.replaceAll(dst1, src1);
}
}{code}
> RBF: Improve error message returned from subcluster
> ---------------------------------------------------
>
> Key: HDFS-13045
> URL: https://issues.apache.org/jira/browse/HDFS-13045
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Wei Yan
> Assignee: Wei Yan
> Priority: Minor
> Attachments: HDFS-13045.000.patch, HDFS-13045.001.patch
>
>
> Currently, Router directly returns exception response from subcluster to
> client, which may not have the correct error message, especially when the
> error message containing a path.
> One example, we have a mount path "/a/b" mapped to subclusterA's "/c/d". If
> user1 does a chown operation on "/a/b", and he doesn't have corresponding
> privilege, currently the error msg looks like "Permission denied. user=user1
> is not the owner of inode=/c/d", which may confuse user. Would be better to
> reverse the path back to original mount path.
>
>
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