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From "Eric Yang (JIRA)" <>
Subject [jira] Created: (CHUKWA-444) Redefine Chukwa time series storage
Date Wed, 30 Dec 2009 08:17:29 GMT
Redefine Chukwa time series storage

                 Key: CHUKWA-444
             Project: Hadoop Chukwa
          Issue Type: New Feature
          Components: Data Processors
         Environment: Redhat EL 5.1, Java 6
            Reporter: Eric Yang

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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