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https://issues.apache.org/jira/browse/YARN-5167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15313325#comment-15313325
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Sangjin Lee commented on YARN-5167:
-----------------------------------
One tricky part about the new approach is to ensure we handle the percent
character only once for an encoding/decoding attempt. If we encode the percent
character multiple times for a given string, bad things will happen.
> Escaping occurences of encodedValues
> ------------------------------------
>
> Key: YARN-5167
> URL: https://issues.apache.org/jira/browse/YARN-5167
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Reporter: Joep Rottinghuis
> Assignee: Sangjin Lee
> Priority: Critical
> Labels: yarn-2928-1st-milestone
>
> We had earlier decided to punt on this, but in discussing YARN-5109 we
> thought it would be best to just be safe rather than sorry later on.
> Encoded sequences can occur in the original string, especially in case of
> "foreign key" if we decide to have lookups.
> For example, space is encoded as %2$.
> Encoding "String with %2$ in it" would decode to "String with in it".
> We though we should first escape existing occurrences of encoded strings by
> prefixing a backslash (even if there is already a backslash that should be
> ok). Then we should replace all unencoded strings.
> On the way out, we should replace all occurrences of our encoded string to
> the original except when it is prefixed by an escape character. Lastly we
> should strip off the one additional backslash in front of each remaining
> (escaped) sequence.
> If we add the following entry to TestSeparator#testEncodeDecode() that
> demonstrates what this jira should accomplish:
> {code}
> testEncodeDecode("Double-escape %2$ and %3$ or \\%2$ or \\%3$, nor
> \\\\%2$ = no problem!", Separator.QUALIFIERS,
> Separator.VALUES, Separator.SPACE, Separator.TAB);
> {code}
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