LoggingResearch created ZOOKEEPER-4857:
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Summary: Enhancing Logging for Ephemeral Type Handling in
EphemeralType.get() Method
Key: ZOOKEEPER-4857
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4857
Project: ZooKeeper
Issue Type: Improvement
Components: server
Affects Versions: 3.9.2
Environment: Zookeeper Version: 3.9.2
Location:
{{{}`zookeeper/zookeeper-server/src/main/java/org/apache/zookeeper/server/EphemeralType.java`{}}},in
{{`get`}} method. Lines 169-187.
Reporter: LoggingResearch
Attachments: EphemeralTypeTest.java, original-vs-log-enhanced.md
The {{EphemeralType.get(long ephemeralOwner)}} method in the ZooKeeper codebase
is responsible for determining the type of ephemeral node based on the provided
{{ephemeralOwner}} value. The current implementation lacks sufficient logging
to diagnose and understand how ephemeral types are determined, especially when
dealing with extended ephemeral types. By enhancing the method with detailed
logging, we can make it easier to track the logic flow and pinpoint issues when
handling different {{ephemeralOwner}} values, particularly under scenarios
involving extended ephemeral types and emulation of older versions.
*Expected Behavior:*
The method should log the steps it takes to determine the {{EphemeralType}}
based on the provided {{ephemeralOwner}} value. This includes logging whether
extended ephemeral types are enabled, if specific properties like TTL emulation
are set, and the final {{EphemeralType}} that is returned. For invalid
{{ephemeralOwner}} values, an error should be logged before an exception is
thrown.
*How-to-Fix:*
We propose to enhance the {{EphemeralType.get(long ephemeralOwner)}} method
with logging statements that detail the decision-making process for returning
an {{{}EphemeralType{}}}. These logs will include the status of feature flags,
the type of {{{}ephemeralOwner{}}}, and error conditions.
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