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[#5882] Ensure we even process tasks if processing of ready channels throws an Exception in event loop.

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Motivation:

If an exception is thrown while processing the ready channels in the EventLoop we should still run all tasks as this may allow to recover. For example a OutOfMemoryError may be thrown and runAllTasks() will free up memory again. Beside this we should also ensure we always allow to shutdown even if an exception was thrown.

Modifications:

- Call runAllTasks() in a finally block
- Ensure shutdown is always handles.

Result:

More robust EventLoop implementations for NIO and Epoll.
This commit is contained in:
Norman Maurer 2016-09-30 14:14:13 +02:00
parent d19a9e6c50
commit c49ec72366
2 changed files with 69 additions and 39 deletions
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50
transport-native-epoll/src/main/java/io/netty/channel/epoll/EpollEventLoop.java
View File

@ -294,24 +294,36 @@ final class EpollEventLoop extends SingleThreadEventLoop {
final int ioRatio = this.ioRatio;
if (ioRatio == 100) {
if (strategy > 0) {
processReady(events, strategy);
try {
if (strategy > 0) {
processReady(events, strategy);
}
} finally {
// Ensure we always run tasks.
runAllTasks();
}
runAllTasks();
} else {
final long ioStartTime = System.nanoTime();
if (strategy > 0) {
processReady(events, strategy);
try {
if (strategy > 0) {
processReady(events, strategy);
}
} finally {
// Ensure we always run tasks.
final long ioTime = System.nanoTime() - ioStartTime;
runAllTasks(ioTime * (100 - ioRatio) / ioRatio);
}
final long ioTime = System.nanoTime() - ioStartTime;
runAllTasks(ioTime * (100 - ioRatio) / ioRatio);
}
if (allowGrowing && strategy == events.length()) {
//increase the size of the array as we needed the whole space for the events
events.increase();
}
} catch (Throwable t) {
handleLoopException(t);
}
// Always handle shutdown even if the loop processing threw an exception.
try {
if (isShuttingDown()) {
closeAll();
if (confirmShutdown()) {
@ -319,19 +331,23 @@ final class EpollEventLoop extends SingleThreadEventLoop {
}
}
} catch (Throwable t) {
logger.warn("Unexpected exception in the selector loop.", t);
// Prevent possible consecutive immediate failures that lead to
// excessive CPU consumption.
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// Ignore.
}
handleLoopException(t);
}
}
}
private static void handleLoopException(Throwable t) {
logger.warn("Unexpected exception in the selector loop.", t);
// Prevent possible consecutive immediate failures that lead to
// excessive CPU consumption.
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// Ignore.
}
}
private void closeAll() {
try {
Native.epollWait(epollFd.intValue(), events, 0);

58
transport/src/main/java/io/netty/channel/nio/NioEventLoop.java
View File

@ -439,34 +439,48 @@ public final class NioEventLoop extends SingleThreadEventLoop {
needsToSelectAgain = false;
final int ioRatio = this.ioRatio;
if (ioRatio == 100) {
processSelectedKeys();
runAllTasks();
try {
processSelectedKeys();
} finally {
// Ensure we always run tasks.
runAllTasks();
}
} else {
final long ioStartTime = System.nanoTime();
processSelectedKeys();
final long ioTime = System.nanoTime() - ioStartTime;
runAllTasks(ioTime * (100 - ioRatio) / ioRatio);
}
if (isShuttingDown()) {
closeAll();
if (confirmShutdown()) {
break;
try {
processSelectedKeys();
} finally {
// Ensure we always run tasks.
final long ioTime = System.nanoTime() - ioStartTime;
runAllTasks(ioTime * (100 - ioRatio) / ioRatio);
}
}
} catch (Throwable t) {
logger.warn("Unexpected exception in the selector loop.", t);
// Prevent possible consecutive immediate failures that lead to
// excessive CPU consumption.
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// Ignore.
}
handleLoopException(t);
}
// Always handle shutdown even if the loop processing threw an exception.
try {
if (isShuttingDown()) {
closeAll();
if (confirmShutdown()) {
return;
}
}
} catch (Throwable t) {
handleLoopException(t);
}
}
}
private static void handleLoopException(Throwable t) {
logger.warn("Unexpected exception in the selector loop.", t);
// Prevent possible consecutive immediate failures that lead to
// excessive CPU consumption.
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// Ignore.
}
}