Vuk Ercegovac created IMPALA-6215:
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Summary: Race between lib_cache and java udf class loading
Key: IMPALA-6215
URL: https://issues.apache.org/jira/browse/IMPALA-6215
Project: IMPALA
Issue Type: Bug
Reporter: Vuk Ercegovac
There's a race between the lib_cache (backend) and UdfExecutor's class loading
(frontend).
A sequence of events that exposes this race is as follows:
1. Backend hive-udf-call, in Init obtains the cached, local path to the jar
containing the java
method to run
2. A function that is contained in the cached jar is dropped
3. The impala server, on a separate thread learns of the dropped function, so
blows away the
containing jar
4. Backend hive-udf-call is opened, which constructs the UdfExecutor given the
cached path
to the jar that has just been deleted. A classloader is created with that
path-- when the
class is resolved, we get a ClassNotFound exception
An example of this sequence shows up occasionally and is the reason for the
following flake:
https://issues.apache.org/jira/browse/IMPALA-6092
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