[jira] [Created] (SPARK-16395) Show warning if CheckpointWriteHandlers are queued up in the fixed thread pool

["Yan Chen (JIRA)" <ji...@apache.org>]

Yan Chen created SPARK-16395:
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             Summary: Show warning if CheckpointWriteHandlers are queued up in the fixed thread pool
                 Key: SPARK-16395
                 URL: https://issues.apache.org/jira/browse/SPARK-16395
             Project: Spark
          Issue Type: Improvement
          Components: Streaming
            Reporter: Yan Chen
            Priority: Critical


When the batch interval is small and time spent writing to HDFS for checkpointing is always longer than the batch interval, the CheckpointWriteHandlers could be queued up in the fixed thread pool. 

Memory issue could happen in this situation.

So if we can log a warning if this situation happens, it will help a lot of people when they encounter the same problem.

The idea is if the size of the queue exceeds some number, we log a warning saying it's queued up.



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