Thomas Watson created ARIES-1034:
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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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