[
https://issues.apache.org/jira/browse/CURATOR-533?focusedWorklogId=292713&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-292713
]
ASF GitHub Bot logged work on CURATOR-533:
------------------------------------------
Author: ASF GitHub Bot
Created on: 11/Aug/19 14:39
Start Date: 11/Aug/19 14:39
Worklog Time Spent: 10m
Work Description: Randgalt commented on pull request #320: [CURATOR-533]
- improve circuit breaking behavior
URL: https://github.com/apache/curator/pull/320#discussion_r312741836
##########
File path:
curator-recipes/src/test/java/org/apache/curator/framework/recipes/leader/TestLeaderLatch.java
##########
@@ -43,60 +43,119 @@
import org.testng.annotations.Test;
import java.util.Arrays;
import java.util.Collection;
+import java.util.Collections;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
+import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
public class TestLeaderLatch extends BaseClassForTests
{
private static final String PATH_NAME = "/one/two/me";
private static final int MAX_LOOPS = 5;
+ private static class Holder
+ {
+ final AtomicInteger stateChangeCount = new AtomicInteger(0);
+ final CountDownLatch isLockedLatch = new CountDownLatch(1);
+ volatile LeaderLatch latch;
+ }
+
@Test
public void testWithCircuitBreaker() throws Exception
{
+ final int threadQty = 5;
+
+ ExecutorService executorService =
Executors.newFixedThreadPool(threadQty);
+ List<Holder> holders = Collections.emptyList();
Timing2 timing = new Timing2();
- ConnectionStateListenerDecorator decorator =
ConnectionStateListenerDecorator.circuitBreaking(new
RetryForever(timing.multiple(2).milliseconds()));
- try ( CuratorFramework client = CuratorFrameworkFactory.builder()
+ ConnectionStateListenerManagerFactory managerFactory =
ConnectionStateListenerManagerFactory.circuitBreaking(new
RetryForever(timing.multiple(2).milliseconds()));
+ CuratorFramework client = CuratorFrameworkFactory.builder()
.connectString(server.getConnectString())
.retryPolicy(new RetryOneTime(1))
- .connectionStateListenerDecorator(decorator)
+ .connectionStateListenerManagerFactory(managerFactory)
.connectionTimeoutMs(timing.connection())
.sessionTimeoutMs(timing.session())
- .build() )
- {
+ .build();
+ try {
client.start();
- AtomicInteger resetCount = new AtomicInteger(0);
- try ( LeaderLatch latch = new LeaderLatch(client, "/foo/bar")
+ client.create().forPath("/hey");
+
+ Semaphore lostSemaphore = new Semaphore(0);
+ ConnectionStateListener undecoratedListener = new
ConnectionStateListener()
{
@Override
- void reset() throws Exception
+ public void stateChanged(CuratorFramework client,
ConnectionState newState)
{
- resetCount.incrementAndGet();
- super.reset();
+ if ( newState == ConnectionState.LOST )
+ {
+ lostSemaphore.release();
+ }
}
- } )
- {
- latch.start();
-
Assert.assertTrue(latch.await(timing.forWaiting().milliseconds(),
TimeUnit.MILLISECONDS));
- for ( int i = 0; i < 5; ++i )
+ @Override
+ public boolean doNotProxy()
{
- server.stop();
- server.restart();
- timing.sleepABit();
+ return true;
}
-
Assert.assertTrue(latch.await(timing.forWaiting().milliseconds(),
TimeUnit.MILLISECONDS));
- Assert.assertEquals(resetCount.get(), 2);
+ };
+
client.getConnectionStateListenable().addListener(undecoratedListener);
+
+ holders = IntStream.range(0, threadQty)
+ .mapToObj(index -> {
+ Holder holder = new Holder();
+ holder.latch = new LeaderLatch(client, "/foo/bar/" + index)
+ {
+ @Override
+ protected void handleStateChange(ConnectionState
newState)
+ {
+ holder.stateChangeCount.incrementAndGet();
+ super.handleStateChange(newState);
+ }
+ };
+ return holder;
+ })
+ .collect(Collectors.toList());
+
+ holders.forEach(holder -> {
+ executorService.submit(() -> {
+ holder.latch.start();
+
Assert.assertTrue(holder.latch.await(timing.forWaiting().milliseconds(),
TimeUnit.MILLISECONDS));
+ holder.isLockedLatch.countDown();
+ return null;
+ });
+ timing.awaitLatch(holder.isLockedLatch);
+ });
+
+ for ( int i = 0; i < 5; ++i )
Review comment:
actually not - just a coincidence. I'll make it `6` so this is clear
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Issue Time Tracking
-------------------
Worklog Id: (was: 292713)
Time Spent: 2h 10m (was: 2h)
> Improve CURATOR-505 by making the CircuitBreaker instance shared
> ----------------------------------------------------------------
>
> Key: CURATOR-533
> URL: https://issues.apache.org/jira/browse/CURATOR-533
> Project: Apache Curator
> Issue Type: Improvement
> Components: Framework, Recipes
> Affects Versions: 4.2.0
> Reporter: Jordan Zimmerman
> Assignee: Jordan Zimmerman
> Priority: Major
> Fix For: 4.2.1
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> CURATOR-505 introduced circuit breaking behavior via
> {{CircuitBreakingConnectionStateListener}} and
> {{ConnectionStateListenerDecorator}}. Elastic has been using it to success
> but reports that the implementation can be improved. The existing
> implementation uses a new {{CircuitBreaker}} for each
> {{ConnectionStateListener}} set in a Curator client. It turns out that this
> is not ideal. Instead, a shared {{CircuitBreaker}} should be used per Curator
> client.
> Unfortunately, the best way to do this is to remove the
> {{ConnectionStateListenerDecorator}} semantics and use a different mechanism.
> This Issue proposes to do this and remove
> {{ConnectionStateListenerDecorator}}. This is a breaking change but given the
> short amount of time it's been in Curator it's unlikely that it's been widely
> adopted.
> If the community considers a breaking change too harsh the older classes can
> be maintained for a while and marked as {{@Deprecated}}.
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