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From "Jerome Boulon (JIRA)" <>
Subject [jira] Commented: (CHUKWA-444) Redefine Chukwa time series storage
Date Mon, 28 Jun 2010 17:18:52 GMT


Jerome Boulon commented on CHUKWA-444:

- Details on memory/cpu usage if HBase not available?
- Can you give more information on the HBase usage?
--> are you sending everything to HBase
--> schema
--> queries
--> latency ... etc

Also, Demux as a M/R is very important for a lot of people as HBase is just for near real
time analytics and not for hourly/daily reports so why do we want to change the architecture?
Like I've said before, I think that chukwa should be an SDK where you can take/use any part
as you need to build your own system. That's seems to be what you want and I'm fine with that
but we also need to get all big parts to work together.

So is it an architecture change (incompatible with the current demux) or a different assembly
in order to get the near real time?


> Redefine Chukwa time series storage
> -----------------------------------
>                 Key: CHUKWA-444
>                 URL:
>             Project: Hadoop Chukwa
>          Issue Type: New Feature
>          Components: Data Processors
>         Environment: Redhat EL 5.1, Java 6
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>         Attachments: CHUKWA-444.patch
> The current Chukwa Record format is not suitable for data visualization.  It is more
like an archive format which combines data from multiple sources (hosts), and group them into
a sorted time partitioned sequence file.  Most of people collected data for two reasons, archive
and data analysis.  The current chukwa record format is fine for archive, but it is not so
great for data analysis.  Data analysis could be further break down into two different types.
 1) Data can be aggregated and summarized, such as metrics.  2) Data that can not be summarized,
like job history.  Type 1 data is useful for visualization by graph, and type 2 data is useful
by plain text viewing or search for a particular event.
> By the above rational, it probably makes sense to restructure Chukwa Records for data
analysis.  Outside of Hadoop world, rrdtools is great for time series data storage, and optimized
for metrics from a single source, i.e. a host.  RRD data file fragments badly when there are
hundred of thousands of sources.  Chukwa time series data storage should be able to combine
multiple data sources into one Chukwa file to combat file fragmentation problem.

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