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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