Ivan Savin created ZEPPELIN-1819:
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             Summary: Cron failed
                 Key: ZEPPELIN-1819
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-1819
             Project: Zeppelin
          Issue Type: Bug
          Components: Interpreters, python-interpreter, zeppelin-interpreter
    Affects Versions: 0.7.0
            Reporter: Ivan Savin


I  had set diffent unterpreteters:
mysql, psql, python.

In python:
I create a connection to PSQL, unload data and agregate them to calculate the 
end report. Then z.show(report).

In mysql:
The path is similar. I generate SQL expression with group aggregation.

In psql:
I only load report data without any aggregation.

I was trying all operations independently and separetly with cron expressions, 
but the result was the same.

First time, Cron worked excellently, but it was out of order (through 2 hours 
to 1,5 days). It looks like the paragraphs will not run. There aren't errors in 
interpreteters and zeppelin logs.

In handle mode i can update all paragraphs



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