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https://issues.apache.org/jira/browse/CURATOR-171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jordan Zimmerman updated CURATOR-171:
-------------------------------------
Summary: LeaderLatch and LeaderSelector should support Revokable behavior
(was: LeaderLatch isn't aware if it's own ephemeral node goes away)
> LeaderLatch and LeaderSelector should support Revokable behavior
> ----------------------------------------------------------------
>
> 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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