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https://issues.apache.org/jira/browse/CURATOR-326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jordan Zimmerman resolved CURATOR-326.
--------------------------------------
Resolution: Fixed
> createContainers fails silently if client is not connected
> ----------------------------------------------------------
>
> Key: CURATOR-326
> URL: https://issues.apache.org/jira/browse/CURATOR-326
> Project: Apache Curator
> Issue Type: Bug
> Components: Framework
> Affects Versions: 3.1.0, 2.10.0
> Reporter: Gerd Behrmann
> Assignee: Jordan Zimmerman
> Fix For: 2.10.1, 3.1.1
>
>
> Calling CuratorFramework#createContainers on a non-existing path while the
> client is not yet connected to the server (e.g. server is down while client
> is starting) fails silently if enough time goes by before the server is
> started.
> The following unit test demonstrates the issue:
> {code:java}
> package dmg.cells.zookeeper;
> import org.apache.curator.framework.CuratorFramework;
> import org.apache.curator.framework.CuratorFrameworkFactory;
> import org.apache.curator.retry.RetryForever;
> import org.apache.curator.test.TestingServer;
> import org.apache.curator.test.Timing;
> import org.junit.Test;
> import static junit.framework.TestCase.assertNotNull;
> public class CuratorTest
> {
> @Test
> public void createContainersTest() throws Exception
> {
> TestingServer server = new TestingServer(false);
> Timing timing = new Timing();
> CuratorFramework client =
> CuratorFrameworkFactory.newClient(server.getConnectString(),
> timing.session(), timing.connection(), new RetryForever(100));
> try {
> new Thread() {
> @Override
> public void run()
> {
> try {
> Thread.sleep(30000);
> server.start();
> } catch (Exception e) {
> e.printStackTrace();
> }
> }
> }.start();
> client.start();
> client.createContainers("/this/does/not/exist");
>
> assertNotNull(client.checkExists().forPath("/this/does/not/exist"));
> } finally {
> client.close();
> server.stop();
> }
> }
> }
> {code}
> The delay before starting the server is significant. If only sleeping for 10
> seconds, the unit test passes. Sleeping for 30 seconds triggers a code path
> in Curator that will cause CuratorFramework#createContainers to wait until
> the server is started, yet it returns without exception and without creating
> the path. The assertion fails.
> I tracked down the issue to ExistingBuilderImpl#pathInForeground in which the
> call to ZKPath#mkdirs is wrapped with a try-catch that ignores the exception.
> Thus the failed operation is neither retried nor propagated.
> Specifically this causes silent problems with PathAndChildren cache as it
> uses EnsureContainer#ensure during startup to ensure that the path exists.
> This internally calls the above createContainers. When it fails silently, the
> recipe fails to register a watcher on the non-existing path and consequently
> the cache stays empty even when the server finally is started and the path is
> populated by another client.
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