jdeppe-pivotal commented on a change in pull request #5420:
URL: https://github.com/apache/geode/pull/5420#discussion_r468997420
##########
File path:
geode-redis/src/main/java/org/apache/geode/redis/internal/netty/ExecutionHandlerContext.java
##########
@@ -138,6 +161,25 @@ public void exceptionCaught(ChannelHandlerContext ctx,
Throwable cause) {
writeToChannel(getExceptionResponse(ctx, cause));
}
+ public EventLoopGroup getSubscriberGroup() {
+ return subscriberGroup;
+ }
+
+ public synchronized void changeChannelEventLoopGroup(EventLoopGroup
newGroup, Runnable callback) {
+ if (newGroup.equals(channel.eventLoop())) {
+ // already registered with newGroup
+ return;
+ }
+ channel.deregister().addListener((ChannelFutureListener) future -> {
+ synchronized (channel) {
Review comment:
Without the synchronization I believe that errors like the following
appear:
```
[vm1] [warn 2020/08/11 21:54:29.557 GMT
<GeodeRedisServer-SubscriberThread-3> tid=0x2ab] A task raised an
exception. Task: io.netty.channel.AbstractChannel$AbstractUnsafe$1@47045f4d
[vm1] java.lang.AssertionError
[vm1] at
io.netty.channel.AbstractChannel$AbstractUnsafe.assertEventLoop(AbstractChannel.java:426)
[vm1] at
io.netty.channel.AbstractChannel$AbstractUnsafe.closeForcibly(AbstractChannel.java:774)
[vm1] at
io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:521)
[vm1] at
io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:417)
[vm1] at
io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:474)
[vm1] at
io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
[vm1] at
io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
[vm1] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
[vm1] at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
[vm1] at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[vm1] at java.base/java.lang.Thread.run(Thread.java:834)
```
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