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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2017/05/23 02:13:04 UTC

[jira] [Created] (SYSTEMML-1616) Multi-threaded JMLC failures due to side effects of constant folding

Matthias Boehm created SYSTEMML-1616:
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             Summary: Multi-threaded JMLC failures due to side effects of constant folding
                 Key: SYSTEMML-1616
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1616
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


In scenarios with multiple concurrently running JMLC connections and prepared scripts per JVM process (e.g., in spark executors, or multi-threaded containers), there are potential side effects between scripts which ultimately can lead to compilation and runtime errors.

The root cause are static reuse objects (for program block and execution context) in the constant folding rewrite. Accordingly, folded constants might leak from one script compilation into another script compilation which can cause all sorts of incomprehensible errors.



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