GitHub user zsxwing opened a pull request:

    https://github.com/apache/spark/pull/17323

    [SPARK-19986][Tests]Make pyspark.streaming.tests.CheckpointTests more stable

    ## What changes were proposed in this pull request?
    
    Sometimes, CheckpointTests will hang on a busy machine because the 
streaming jobs are too slow and cannot catch up. I observed the scheduled delay 
was keeping increasing for dozens of seconds locally.
    
    This PR increases the batch interval from 0.5 seconds to 2 seconds to 
generate less Spark jobs. It should make 
`pyspark.streaming.tests.CheckpointTests` more stable.
    
    ## How was this patch tested?
    
    Jenkins


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/zsxwing/spark SPARK-19986

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/17323.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #17323
    
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commit 6dddaab4715d3cce093c4a00f87a0c7cd1bda4db
Author: Shixiong Zhu <shixi...@databricks.com>
Date:   2017-03-16T21:13:43Z

    Fix test

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