apache / apache/helix

A critical Zookeeper bug could affect helix

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bug
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Java
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Description

### Describe the bug and how to reproduce
The latest Helix calls zookeeper 3.6.3. Some bugs of this version can affect Helix. For example, a critical bug affects 3.6.3:
https://issues.apache.org/jira/browse/ZOOKEEPER-4712

The buggy method is org.apache.zookeeper.server.ZooKeeperServer.shutdown(boolean). This method is called by ZkServer.shutdown().

### Expected behavior
Please update Zookeeper to a newer version.

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