geekzhu1314520 commented on a change in pull request #1354: Update
BrokerOuterAPI.java
URL: https://github.com/apache/rocketmq/pull/1354#discussion_r310461740
##########
File path:
broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java
##########
@@ -123,7 +124,7 @@ public void updateNameServerAddressList(final String
addrs) {
final int timeoutMills,
final boolean compressed) {
- final List<RegisterBrokerResult> registerBrokerResultList =
Lists.newArrayList();
+ final List<RegisterBrokerResult> registerBrokerResultList =
Collections.synchronizedList(Lists.newArrayList());
Review comment:
registerBrokerResultList is not threa-safe in the code:
```
for (final String namesrvAddr : nameServerAddressList) {
brokerOuterExecutor.execute(new Runnable() {
@Override
public void run() {
try {
RegisterBrokerResult result =
registerBroker(namesrvAddr,oneway, timeoutMills,requestHeader,body);
if (result != null) {
registerBrokerResultList.add(result);
}
log.info("register broker[{}]to name server {}
OK", brokerId, namesrvAddr);
} catch (Exception e) {
log.warn("registerBroker Exception, {}",
namesrvAddr, e);
} finally {
countDownLatch.countDown();
}
}
});
}
```
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