Shri Javadekar created JCLOUDS-358:
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Summary: Improve blob request signing performance
Key: JCLOUDS-358
URL: https://issues.apache.org/jira/browse/JCLOUDS-358
Project: jclouds
Issue Type: Improvement
Components: jclouds-blobstore
Affects Versions: 1.6.3
Reporter: Shri Javadekar
Fix For: 1.7.0
I ran an application which calls into jclouds for signing blob put requests
(against the aws-s3 blobstore) and analyzed its performance using YourKit. The
analysis shows that each request for signing blobs takes about 13 ms (average
of 160K requests). > 10 out of these 13 ms are spent in the
RestAnnotationProcessor. Mainly in RestAnnotationProcessor.apply() and
RestAnnotationProcessor.decorateRequest(). Looking at the code, it seems that
processing of all the annotations is done for every request, which also means
that there is the Java Reflections overhead for every request.
Are there options that we can explore to make this better; such as
i) caching the output of the RestAnnotationProcessor and only updating fields
that change in every request
ii) not using java Reflections API
Note that I am using jclouds-1.6.3-SNAPSHOT which includes the fixes for bug
301.
https://issues.apache.org/jira/browse/JCLOUDS-301
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