PENG Zhengshuai created KYLIN-4044:
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Summary: CuratorScheduler may throw NPE when init service Cache
Key: KYLIN-4044
URL: https://issues.apache.org/jira/browse/KYLIN-4044
Project: Kylin
Issue Type: Bug
Affects Versions: v3.0.0
Reporter: PENG Zhengshuai
Assignee: PENG Zhengshuai
Currently Kylin uses Curator 2.12.0 dependencies.
There is an issue of CURATOR-452 which may affect Kylin Server Discovery.
The CURATOR-452 links here: https://issues.apache.org/jira/browse/CURATOR-452,
but this fix hasn't been back-ported to curator-2.x branch.
When kylin server starts, it will discover other kylin server nodes in ZK path,
and then register itself to ZK path. Curator discovery and cache implementation
will initialize the service cache and deserialize the ServiceInstance by *
JsonInstanceSerializer* which implemented by Kylin.
This curator issue may pass a Null value in
JsonInstanceSerializer#deserialize(byte[] bytes) and cause the NPE.
Kylin now uses the zookeeper version dependency with version 3.4.13, so
according to the curator compatibility in
https://curator.apache.org/zk-compatibility.html#, I think it's safe to upgrade
the Curator version to 4.0+ in Kylin
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