[HIVE-23596] LLAP: Encode initial guaranteed task information in containerId

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-1
• Component/s: llap
• Labels: pull-request-available
• Assignee: Mustafa İman
• Reporter: Mustafa İman
• Created: 02/Jun/20 22:39
• Updated: 17/Nov/22 08:48
• Resolved: 04/Jun/20 17:21

Description

We should avoid calling LlapTaskScheduler to get initial isguaranteed flag for all the tasks. It causes arbitrary delays in sending tasks out. Since communicator is a single thread, any blocking there delays all the tasks.

There are https://jira.apache.org/jira/browse/TEZ-4192 and https://jira.apache.org/jira/browse/HIVE-23589 for a proper solution to this. However, that requires a Tez release which seems far right now. We can replace the current hack with another hack that does not require locking.

Issue Links

• links to: GitHub Pull Request #1053