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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2019/03/07 17:09:30 UTC
[GitHub] [flink] zentol commented on a change in pull request #7935:
[FLINK-11855] Fix race condition in EmbeddedLeaderService#GrantLeadershipCall
zentol commented on a change in pull request #7935: [FLINK-11855] Fix race condition in EmbeddedLeaderService#GrantLeadershipCall
URL: https://github.com/apache/flink/pull/7935#discussion_r263479048
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File path: flink-runtime/src/main/java/org/apache/flink/runtime/highavailability/nonha/embedded/EmbeddedLeaderService.java
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@@ -506,33 +515,28 @@ public void run() {
private static class GrantLeadershipCall implements Runnable {
- private final EmbeddedLeaderElectionService leaderElectionService;
+ private final LeaderContender contender;
private final UUID leaderSessionId;
private final Logger logger;
GrantLeadershipCall(
- EmbeddedLeaderElectionService leaderElectionService,
+ LeaderContender contender,
UUID leaderSessionId,
Logger logger) {
- this.leaderElectionService = checkNotNull(leaderElectionService);
+ this.contender = checkNotNull(contender);
this.leaderSessionId = checkNotNull(leaderSessionId);
this.logger = checkNotNull(logger);
}
@Override
public void run() {
- leaderElectionService.isLeader = true;
-
- final LeaderContender contender = leaderElectionService.contender;
-
try {
contender.grantLeadership(leaderSessionId);
}
catch (Throwable t) {
logger.warn("Error granting leadership to contender", t);
contender.handleError(t instanceof Exception ? (Exception) t : new Exception(t));
- leaderElectionService.isLeader = false;
Review comment:
The flag is no longer reset if the grant fails.
I'm wondering whether we need this flag at all. It's only being used in `EmbeddedLeaderElectionService#hasLeadership`, but shouldn't the `leaderSessionId` be sufficient for checking that? This seems especially true now that `updateLeader` updates both `isLeader` and `currentLeaderSessionId` right after another.
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