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

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Details

Type: Sub-task
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 4.0.0-alpha-1
Component/s: llap
Labels:
- pull-request-available

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.