[jira] [Created] (SPARK-18557) Downgrade the memory leak warning message

["Reynold Xin (JIRA)" <ji...@apache.org>]

Reynold Xin created SPARK-18557:
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             Summary: Downgrade the memory leak warning message
                 Key: SPARK-18557
                 URL: https://issues.apache.org/jira/browse/SPARK-18557
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
            Reporter: Reynold Xin
            Assignee: Reynold Xin


TaskMemoryManager has a memory leak detector that gets called at task completion callback and checks whether any memory has not been released. If they are not released by the time the callback is invoked, TaskMemoryManager releases them.

The current error message says something like the following:
{noformat}
WARN  [Executor task launch worker-0]
org.apache.spark.memory.TaskMemoryManager - leak 16.3 MB memory from
org.apache.spark.unsafe.map.BytesToBytesMap@33fb6a15
{noformat}

In practice, there are multiple reasons why these can be triggered in the normal code path (e.g. limit, or task failures), and the fact that these messages are log means the "leak" is fixed by TaskMemoryManager.

To not confuse users, we should downgrade the message from warning to debug level, and avoid using the word "leak" since it is not actually a leak.




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