[jira] [Created] (NIFI-3067) Upgrade ZooKeeper dependency version

["Jeff Storck (JIRA)" <ji...@apache.org>]

Jeff Storck created NIFI-3067:
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             Summary: Upgrade ZooKeeper dependency version
                 Key: NIFI-3067
                 URL: https://issues.apache.org/jira/browse/NIFI-3067
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework, Tools and Build
    Affects Versions: 1.0.0, 1.1.0
            Reporter: Jeff Storck
             Fix For: 1.2.0


ZooKeeper 3.4.6 has dependencies on log4j, although it uses slf4j as the logging API; if the log4j dependency is excluded from ZooKeeper 3.4.6 in favor of using logback, ZooKeeper has runtime issues.  

ZooKeeper 3.4.6's hard dependency on log4j has caused issues in NiFi Toolkit, which originally used logback.  When the ZooKeeper Migrator was added to NiFi Toolkit, the log4j dependency came with it, which broke the logging in NiFi Toolkit due to having both logback and log4j on the classpath.  To resolve the issue in NiFI Toolkit, the logback dependency has been removed, and it now explicitly uses log4j.

In ZooKeeper 3.5.2 and 3.6.0, the dependency on log4j has been removed.  NiFi (and the Toolkit) would benefit from upgrading to one of these versions of ZooKeeper, allowing the usage of log4j or logback without the classpath and runtime issues mentioned above.





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