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https://issues.apache.org/jira/browse/YARN-5109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15294555#comment-15294555
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Sangjin Lee commented on YARN-5109:
-----------------------------------
[~jrottinghuis], [~vrushalic], and I dug a little bit, and it appears to be
intentional. See YARN-3906 and YARN-3815 (see [the attached
doc|https://issues.apache.org/jira/secure/attachment/12743391/hbase-schema-proposal-for-aggregation.pdf]).
The main motivation for reversing the user and the cluster in the entity table
is to accommodate the fact that the table can get real large and we wanted to
provide good partitioning by using the user dimension rather than the cluster
dimension. We preserved the original order (cluster and then user) for the
application table.
The bottom line is that since this was the intended design and nothing is
broken, we should not revisit it as part of this JIRA. Let me know if that is
OK with you guys.
> 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
> Attachments: YARN-5109-YARN-2928.01.patch,
> YARN-5109-YARN-2928.02.patch
>
>
> 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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