You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@cassandra.apache.org by "Jaydeepkumar Chovatia (Jira)" <ji...@apache.org> on 2025/03/07 18:07:00 UTC
[jira] [Updated] (CASSANDRA-20265) Race condition in auto-repair scheduler
[ https://issues.apache.org/jira/browse/CASSANDRA-20265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jaydeepkumar Chovatia updated CASSANDRA-20265:
----------------------------------------------
Resolution: Fixed
Status: Resolved (was: Triage Needed)
> Race condition in auto-repair scheduler
> ---------------------------------------
>
> Key: CASSANDRA-20265
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20265
> Project: Apache Cassandra
> Issue Type: Bug
> Reporter: Kristijonas Zalys
> Assignee: Kristijonas Zalys
> Priority: Normal
>
> Fixes a race condition inside the auto-repair scheduler which can cause a large buildup of active repair jobs.
> The conditions for this race condition can be explained by the graph below:
> !https://github-production-user-asset-6210df.s3.amazonaws.com/17912591/416091435-6a84a770-8786-4c3a-b531-9c4ed804e813.png?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAVCODYLSA53PQK4ZA%2F20250225%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20250225T014515Z&X-Amz-Expires=300&X-Amz-Signature=e1228842f299ca65f5a18863c80e22ba41e0b8e1869ee3480ebf9216cede8dc3&X-Amz-SignedHeaders=host!
> The auto-repair scheduler has a single progress listener object for all repair jobs it schedules. This means that the scheduler cannot differentiate between an event coming from job # 1 and an event coming from job # 2. It simply assumes that the event comes from the last repair job that the scheduler created. Such an assumption leads to a situation where:
> 1. The scheduler receives a failure from repair job # 1 and schedules repair job # 2 {*}{*}(1)
> 1. The scheduler then receives a 2nd failure from repair job # 1 and assumes that job # 2 failed even though it is still running (2). Repair job # 3 is then scheduled.
> 1. Both repair job # 2 and repair job # 3 are running at the same time (3)
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscribe@cassandra.apache.org
For additional commands, e-mail: commits-help@cassandra.apache.org