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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-4688) Optimizer hangs for hours when optimizing complex plans
Date Mon, 26 Sep 2016 18:21:20 GMT
Fabian Hueske created FLINK-4688:
------------------------------------

             Summary: Optimizer hangs for hours when optimizing complex plans
                 Key: FLINK-4688
                 URL: https://issues.apache.org/jira/browse/FLINK-4688
             Project: Flink
          Issue Type: Bug
          Components: Optimizer
    Affects Versions: 1.2.0, 1.1.3
            Reporter: Fabian Hueske


When optimizing a plan with many operators (more than 250), the optimizer gets stuck for hours.

A user reported this problem on the user@f.a.o list [1] and provided stacktraces taken at
different points in time (shortly after submission, 32 minutes and 76 minutes after submission)
(see attachments).

The stacktraces show deeply recursive {{hasDamOnPathDownTo()}} calls. Maybe it is possible
to improve the performance by caching the results?

[1] http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Complex-batch-workflow-needs-too-much-time-to-create-executionPlan-tp8596.html



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