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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5109) timestamps are stored unencoded causing parse errors
Date Wed, 18 May 2016 16:06:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-5109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15289207#comment-15289207
] 

Sangjin Lee commented on YARN-5109:
-----------------------------------

Thanks for looking into this [~varun_saxena]. It might be good to write a small unit test
for this. FYI, the offending timestamp in the above example is 1463437148774.

I think the scope of this issue is rather big unfortunately. If I'm not mistaken, any time
a byte array is passed into {{Separator.join()}} without encoding we need to encode it. Of
course it also means we need to decode it on the way out.

For example, {{ColumnHelper.getColumnQualifier()}} accepts both {{columnPrefixBytes}} and
{{qualifier}} as is and joins them.

I can work with you to identify all the places where this is a problem and also the solution.
Let's discuss it here on the JIRA.

> timestamps are stored unencoded causing parse errors
> ----------------------------------------------------
>
>                 Key: YARN-5109
>                 URL: https://issues.apache.org/jira/browse/YARN-5109
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Varun Saxena
>            Priority: Blocker
>              Labels: yarn-2928-1st-milestone
>
> When we store timestamps (for example as part of the row key or part of the column name
for an event), the bytes are used as is without any encoding. If the byte value happens to
contain a separator character we use (e.g. "!" or "="), it causes a parse failure when we
read it.
> I came across this while looking into this error in the timeline reader:
> {noformat}
> 2016-05-17 21:28:38,643 WARN org.apache.hadoop.yarn.server.timelineservice.storage.common.TimelineStorageUtils:
incorrectly formatted column name: it will be discarded
> {noformat}
> I traced the data that was causing this, and the column name (for the event) was the
following:
> {noformat}
> i:e!YARN_RM_CONTAINER_CREATED=\x7F\xFF\xFE\xABDY=\x99=YARN_CONTAINER_ALLOCATED_HOST
> {noformat}
> Note that the column name is supposed to be of the format (event id)=(timestamp)=(event
info key). However, observe the timestamp portion:
> {noformat}
> \x7F\xFF\xFE\xABDY=\x99
> {noformat}
> The presence of the separator ("=") causes the parse error.



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