Vuk Ercegovac created IMPALA-6215: ------------------------------------- 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 -- This message was sent by Atlassian JIRA (v6.4.14#64029)