tillrohrmann commented on a change in pull request #11313: [FLINK-16373] Make
JobManagerLeaderListener thread safe
URL: https://github.com/apache/flink/pull/11313#discussion_r393699109
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/JobLeaderService.java
##########
@@ -251,90 +254,83 @@ private JobManagerLeaderListener(JobID jobId) {
}
public void stop() {
- stopped = true;
+ synchronized (lock) {
+ stopped = true;
- if (rpcConnection != null) {
- rpcConnection.close();
+ if (rpcConnection != null) {
+ rpcConnection.close();
+ }
}
}
public void reconnect() {
- if (stopped) {
- LOG.debug("Cannot reconnect because the
JobManagerLeaderListener has already been stopped.");
- } else {
- final RegisteredRpcConnection<JobMasterId,
JobMasterGateway, JMTMRegistrationSuccess> currentRpcConnection = rpcConnection;
-
- if (currentRpcConnection != null) {
- if (currentRpcConnection.isConnected())
{
-
- if
(currentRpcConnection.tryReconnect()) {
- // double check for
concurrent stop operation
- if (stopped) {
-
currentRpcConnection.close();
- }
- } else {
- LOG.debug("Could not
reconnect to the JobMaster {}.", currentRpcConnection.getTargetAddress());
- }
+ synchronized (lock) {
+ if (stopped) {
+ LOG.debug("Cannot reconnect because the
JobManagerLeaderListener has already been stopped.");
+ } else {
+ if (rpcConnection != null) {
+ Preconditions.checkState(
+
rpcConnection.tryReconnect(),
+ "Illegal concurrent
modification of the JobManagerLeaderListener rpc connection.");
} else {
- LOG.debug("Ongoing registration
to JobMaster {}.", currentRpcConnection.getTargetAddress());
+ LOG.debug("Cannot reconnect to
an unknown JobMaster.");
}
- } else {
- LOG.debug("Cannot reconnect to an
unknown JobMaster.");
}
}
}
@Override
- public void notifyLeaderAddress(final @Nullable String
leaderAddress, final @Nullable UUID leaderId) {
- if (stopped) {
- LOG.debug("{}'s leader retrieval listener
reported a new leader for job {}. " +
- "However, the service is no longer
running.", JobLeaderService.class.getSimpleName(), jobId);
- } else {
- final JobMasterId jobMasterId =
JobMasterId.fromUuidOrNull(leaderId);
-
- LOG.debug("New leader information for job {}.
Address: {}, leader id: {}.",
- jobId, leaderAddress, jobMasterId);
-
- if (leaderAddress == null ||
leaderAddress.isEmpty()) {
- // the leader lost leadership but there
is no other leader yet.
- if (rpcConnection != null) {
- rpcConnection.close();
- }
+ public void notifyLeaderAddress(@Nullable final String
leaderAddress, @Nullable final UUID leaderId) {
+ Optional<JobMasterId> jobManagerLostLeadership =
Optional.empty();
-
jobLeaderListener.jobManagerLostLeadership(jobId, currentJobMasterId);
-
- currentJobMasterId = jobMasterId;
+ synchronized (lock) {
+ if (stopped) {
+ LOG.debug("{}'s leader retrieval
listener reported a new leader for job {}. " +
+ "However, the service is no
longer running.", JobLeaderService.class.getSimpleName(), jobId);
} else {
- currentJobMasterId = jobMasterId;
+ final JobMasterId jobMasterId =
JobMasterId.fromUuidOrNull(leaderId);
- if (rpcConnection != null) {
- // check if we are already
trying to connect to this leader
- if
(!Objects.equals(jobMasterId, rpcConnection.getTargetLeaderId())) {
+ LOG.debug("New leader information for
job {}. Address: {}, leader id: {}.",
+ jobId, leaderAddress,
jobMasterId);
+
+ if (leaderAddress == null ||
leaderAddress.isEmpty()) {
+ // the leader lost leadership
but there is no other leader yet.
+ if (rpcConnection != null) {
rpcConnection.close();
+ }
+ jobManagerLostLeadership =
Optional.of(currentJobMasterId);
Review comment:
You are right. I will change it.
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