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From "Thomas Watson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ARIES-1034) Excessive IO when install subsystems and when initializing the root subsystem
Date Wed, 20 Mar 2013 21:21:17 GMT
Thomas Watson created ARIES-1034:
------------------------------------

             Summary: Excessive IO when install subsystems and when initializing the root
subsystem
                 Key: ARIES-1034
                 URL: https://issues.apache.org/jira/browse/ARIES-1034
             Project: Aries
          Issue Type: Improvement
          Components: Subsystem
            Reporter: Thomas Watson


I noticed this when activating the subsystem.core bundle.  It was taking a long time to start
subsystem.core.  A lot of IO is being done to establish the constituents of the root subsystem.
 In my particular environment there are about 120 bundles.  All of these bundles end up being
constituents of the root subsystem.

In the call to org.apache.aries.subsystem.core.internal.Subsystems.getRootSubsystem() the
deployment manifest for the root subsystem is being rewritten once for each constituent detected
and the file content gets progressively larger with each constituent added.  That ends up
being 121 times the whole file gets written and the final content of the file ends up being
around 14 KB.

I have two observations:

1) a BufferedOutputStream is not used to write the deployment manifest.  Since the file can
grow to several KB in size it would be optimal to use a buffered output stream.

2) can we avoid writing the persistent deployment manifest until a successful installation
is done and then at the end we only write the complete deployment manifest once?


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