Benjamin Jaton created CURATOR-355:
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Summary: Curator client hangs when connecting to read-only ensemble
Key: CURATOR-355
URL: https://issues.apache.org/jira/browse/CURATOR-355
Project: Apache Curator
Issue Type: Bug
Components: Client
Affects Versions: 2.11.0
Reporter: Benjamin Jaton
Priority: Critical
Attachments: test2.log
ZK is 3.5.1-alpha
I have a 3 nodes ZK cluster , readonly mode is enabled.
2 nodes are down, so one of them (QA-E8WIN11) is in read-only (verified by
using the ZK API manually). All the machines of the ensemble can be pinged from
the client.
I'm using this piece of code:
{code}
Builder curatorClientBuilder = CuratorFrameworkFactory.builder()
.connectString("QA-E8WIN11:2181,QA-E8WIN12:2181")
.sessionTimeoutMs(45000).connectionTimeoutMs(15000)
.retryPolicy(new RetryNTimes(3,
5000)).canBeReadOnly(true);
CuratorFramework client = curatorClientBuilder.build();
client.start();
client.getZookeeperClient().blockUntilConnectedOrTimedOut();
System.out.println("Successfully established the connection
with ZooKeeper");
client.getData().forPath("/");
System.out.println("Done.");{code}
When curator pick the host that is UP first, it goes through very quickly. When
it picks the host that is down first (QA-E8WIN12), it seems to be stuck at the
getData() call for a very long time, and then eventually fail with a
ConnectionLossException. (see attached log)
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