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From "Andrew Onischuk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-11529) Work with json module takes too long
Date Fri, 29 May 2015 11:30:17 GMT
Andrew Onischuk created AMBARI-11529:
----------------------------------------

             Summary: Work with json module takes too long
                 Key: AMBARI-11529
                 URL: https://issues.apache.org/jira/browse/AMBARI-11529
             Project: Ambari
          Issue Type: Bug
            Reporter: Andrew Onischuk
            Assignee: Andrew Onischuk
             Fix For: 2.1.0


Due to profiling below, from 420 seconds of deploy json.load and json.loads
take 40 seconds (which even doesn't include working with json in ambari-agent
itself, only script):

    
    
          204    0.007    0.000   20.182    0.099 __init__.py:243(load)
          351    0.002    0.000   17.894    0.051 __init__.py:270(loads)
    

This is because json module for Python 2.6 is extremety slow. There are
benchmark for it on here:  
<http://stackoverflow.com/questions/706101/python-json-decoding-performance>

due to it simplejson is at least ~40 times faster for deserializing.

Also another thing to do in scope of this jira is to replace inspect module
usage with os._getframe() which doesn't use realpath function that
intensively, taking away 10 more seconds.

    
    
    30049/21438    1.712    0.000   10.873    0.001 posixpath.py:354(realpath)
    





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