nwangtw commented on issue #2847: Replace CHECK() with CHECK_*() so that when a 
check is failing, more …
URL: https://github.com/apache/incubator-heron/pull/2847#issuecomment-378702937
   Just did a test. Seems the checks work with << as expected.
   Run 1:
   int a = 1, b = 2;
   CHECK(a > b) << "Failing check 'a > b'";
   The output is:
   Check failed: a > b Failing check 'a > b'
   Run 2:
   int a = 1, b = 2;
   CHECK_GT(a, b) << "Failing check 'gt(a,b)'";
   The output is:
   Check failed: a > b (1 vs. 2) Failing check 'gt(a, b)'
   Let me update the checks with << operator then.

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