Ian Buss created IMPALA-8469:
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Summary: Admit memory not set in backend descriptor for
coordinator-only nodes
Key: IMPALA-8469
URL: https://issues.apache.org/jira/browse/IMPALA-8469
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 3.2.0
Reporter: Ian Buss
When configuring admission control with dedicated coordinator daemons, queries
with pool memory limits fail with the admission rejections like the following:
{noformat}
Rejected query from pool root.default: request memory needed 3.00 GB per node
is greater than memory available for admission 0 of coord1.example.com:22000.
Use the MEM_LIMIT query option to indicate how much memory is required per
node.{noformat}
Tracing this in the code leads us to line 576 of {{admission-controller.cc}}
and therefore to suspect that the local {{TBackendDescriptor}}
({{local_backend_descriptor_}}) for the coordinator node in {{scheduler.cc}}
never has {{admit_mem_limit}} set, and thus ends up with the default value of 0.
The issue goes away if NO_SPECIALIZATION is used instead of COORDINATOR_ONLY.
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