You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues-all@impala.apache.org by "Noémi Pap-Takács (Jira)" <ji...@apache.org> on 2026/10/19 13:13:00 UTC
[jira] [Updated] (IMPALA-14605) Memory leak in global admissiond when dequeuing cancelled queries
[ https://issues.apache.org/jira/browse/IMPALA-14605?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Noémi Pap-Takács updated IMPALA-14605:
--------------------------------------
Fix Version/s: Impala 5.0.0
> Memory leak in global admissiond when dequeuing cancelled queries
> -----------------------------------------------------------------
>
> Key: IMPALA-14605
> URL: https://issues.apache.org/jira/browse/IMPALA-14605
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 4.5.0
> Reporter: Yida Wu
> Assignee: Yida Wu
> Priority: Critical
> Labels: admission-control
> Fix For: Impala 5.0.0
>
>
> We have identified a memory leak scenario in the global admissiond. The issue occurs when a query waiting in the admission queue is cancelled due to backpressure failures but is not properly removed from the admission state map during the dequeue process.
> Sequence of Events:
> A GetQueryStatus() call from coord fails due to backpressure in admissiond.
> {code:java}
> I20251203 05:01:47.795506 3938873 status.cc:129] c0476ba9e0acf5c3:012f334b00000000] GetQueryStatus rpc failed: Remote error: Service unavailable: GetQueryStatus request on impala.AdmissionControlService from 127.0.0.6:43351 dropped due to backpressure. The service queue contains 5 items out of a maximum of 2147483647; memory consumption is 68.54 MB.
> {code}
> Consequently, the coord sends a cancel request for the queued query. The CancelAdmission function sets the cancel flag in the admission state, code ref: https://github.com/apache/impala/blob/master/be/src/scheduling/admission-control-service.cc#L282-L289
> {code:java}
> I20251203 05:11:47.975906 104 admission-control-service.cc:284] CancelAdmission: query_id=c0476ba9e0acf5c3:012f334b00000000
> {code}
> The admissiond tries to dequeue the query. It correctly identifies that the query has been cancelled.
> {code:java}
> I20251203 05:11:48.116552 117 admission-controller.cc:2650] Dequeued cancelled query=c0476ba9e0acf5c3:012f334b00000000
> {code}
> The memory leak is located in this dequeue logic. While the admissiond recognizes the query is cancelled, it fails to remove the query entry from the state map before finishing the process.
> https://github.com/apache/impala/blob/master/be/src/scheduling/admission-controller.cc#L2655-L2658
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-all-unsubscribe@impala.apache.org
For additional commands, e-mail: issues-all-help@impala.apache.org