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Review request for Ambari, Attila Doroszlai, Myroslav Papirkovskyy, and Sid 
Wagle.


Bugs: AMBARI-22119
    https://issues.apache.org/jira/browse/AMBARI-22119


Repository: ambari


Description
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Agent topology file cache became corrupt after writing of topology to it. It
contained some gibberish. I think it might be a rare simplejson bug. The file
was not trimmed correctly, during rewritting.

This happened only once on perf cluster. But worth a preventive fix.


Diffs
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  ambari-agent/src/main/python/ambari_agent/ClusterCache.py 40b32886cf 


Diff: https://reviews.apache.org/r/62750/diff/1/


Testing
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mvn clean test


Thanks,

Andrew Onischuk

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