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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3908) Bugs in HBaseTimelineWriterImpl
Date Mon, 27 Jul 2015 19:42:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-3908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14643267#comment-14643267

Zhijie Shen commented on YARN-3908:

Okay, it's fair point. It seems that the key design significantly depends on how we want to
operate on the events. The current key design is most friendly to check if there exists the
events who match the given event ID to match some given info key (and its value). But if you
want to fetch everything that belongs to this event (our query needs to do this, as it's implicitly
an atomic unit for now), it seems to be inevitable to scan through all these columns that
have the given event ID (correct me if I'm wrong :-). If so, there seems to to have little
gain from this key design, while complicating the event encapsulation logic.

And after rethinking of the current query to support (YARN-3051), I want to amend my suggestion.
It seems to be more reasonable to use {{e!eventTimestamp?eventId?eventInfoKey}}, such that
we can natively scan through the events of one entity one-by-one return them in a chronological

> Bugs in HBaseTimelineWriterImpl
> -------------------------------
>                 Key: YARN-3908
>                 URL: https://issues.apache.org/jira/browse/YARN-3908
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Vrushali C
>         Attachments: YARN-3908-YARN-2928.001.patch, YARN-3908-YARN-2928.002.patch, YARN-3908-YARN-2928.003.patch,
YARN-3908-YARN-2928.004.patch, YARN-3908-YARN-2928.004.patch, YARN-3908-YARN-2928.005.patch
> 1. In HBaseTimelineWriterImpl, the info column family contains the basic fields of a
timeline entity plus events. However, entity#info map is not stored at all.
> 2 event#timestamp is also not persisted.

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