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Posted to dev@curator.apache.org by "John Vines (JIRA)" <ji...@apache.org> on 2014/12/09 22:30:12 UTC
[jira] [Created] (CURATOR-171) LeaderLatch isn't aware if it's own
ephemeral node goes away
John Vines created CURATOR-171:
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Summary: LeaderLatch isn't aware if it's own ephemeral node goes away
Key: CURATOR-171
URL: https://issues.apache.org/jira/browse/CURATOR-171
Project: Apache Curator
Issue Type: Bug
Components: Recipes
Reporter: John Vines
Running the following code- {code} public static void main(String args[]) throws Exception {
CuratorFramework curator = CuratorFrameworkFactory.builder().connectString("localhost:2181").retryPolicy(new ExponentialBackoffRetry(1000, 5))
.authorization("digest", "accumulo:DEFAULT".getBytes()).build();
curator.start();
LeaderLatch latch = new LeaderLatch(curator, "/latch", "test");
LeaderLatch latch2 = new LeaderLatch(curator, "/latch", "test2");
latch.addListener(new LeaderLatchListener() {
@Override
public void isLeader() {
System.out.println("Became leader!");
}
@Override
public void notLeader() {
System.out.println("Lost leadership!");
}
});
latch.start();
latch.await();
latch2.start();
Thread.sleep(1000);
System.out.println("Does latch1 have leadership? " + latch.hasLeadership());
System.out.println("Does latch2 have leadership? " + latch2.hasLeadership());
for (String child : curator.getChildren().forPath("/latch"))
if (Arrays.equals(curator.getData().forPath(ZKPaths.makePath("/latch", child)), "test".getBytes()))
curator.delete().deletingChildrenIfNeeded().forPath(ZKPaths.makePath("/latch", child));
Thread.sleep(1000);
System.out.println("Does latch1 have leadership? " + latch.hasLeadership());
System.out.println("Does latch2 have leadership? " + latch2.hasLeadership());
Thread.sleep(1000 * 40);
System.out.println("Does latch1 have leadership? " + latch.hasLeadership());
System.out.println("Does latch2 have leadership? " + latch2.hasLeadership());
latch.close();
latch2.close();
curator.close();
}{code}
I get the following output-{noformat}Became leader!
Does latch1 have leadership? true
Does latch2 have leadership? false
Does latch1 have leadership? true
Does latch2 have leadership? true
Does latch1 have leadership? true
Does latch2 have leadership? true
{noformat}
I expect that when the ephemeral node is deleted, latch1 no longer reports itself as having leadership. Furthermore, I expect it to trigger the notLeader call.
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