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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