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https://issues.apache.org/jira/browse/CURATOR-533?focusedWorklogId=283902&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-283902
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ASF GitHub Bot logged work on CURATOR-533:
------------------------------------------
Author: ASF GitHub Bot
Created on: 28/Jul/19 16:46
Start Date: 28/Jul/19 16:46
Worklog Time Spent: 10m
Work Description: Randgalt commented on pull request #320: [CURATOR-533]
- introduced circuit breaking behavior
URL: https://github.com/apache/curator/pull/320
CURATOR-505 introduced circuit breaking behavior via
CircuitBreakingConnectionStateListener and ConnectionStateListenerDecorator.
Elastic has been using it to success but reports that the implementation can be
improved. The existing implementation uses a new CircuitBreaker for each
ConnectionStateListener set in a Curator client. It turns out that this is not
ideal. Instead, a shared CircuitBreaker should be used per Curator client.
Unfortunately, the best way to do this is to remove the
ConnectionStateListenerDecorator semantics and use a different mechanism. This
Issue proposes to do this and remove ConnectionStateListenerDecorator. This is
a breaking change but given the short amount of time it's been in Curator it's
unlikely that it's been widely adopted.
In this commit, ConnectionStateListenerDecorator is removed in favor of
ConnectionStateListenerManagerFactory. ConnectionStateManager uses this factory
to create the container to hold registered ConnectionStateListeners. A new
CircuitBreakerManager now manages the circuit breaking behavior using a shared
CircuitBreaker.
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Issue Time Tracking
-------------------
Worklog Id: (was: 283902)
Time Spent: 10m
Remaining Estimate: 0h
> Improve CURATOR-505 by making the CircuitBreaker instance shared
> ----------------------------------------------------------------
>
> Key: CURATOR-533
> URL: https://issues.apache.org/jira/browse/CURATOR-533
> Project: Apache Curator
> Issue Type: Improvement
> Components: Framework, Recipes
> Affects Versions: 4.2.0
> Reporter: Jordan Zimmerman
> Assignee: Jordan Zimmerman
> Priority: Major
> Fix For: 4.2.1
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> CURATOR-505 introduced circuit breaking behavior via
> {{CircuitBreakingConnectionStateListener}} and
> {{ConnectionStateListenerDecorator}}. Elastic has been using it to success
> but reports that the implementation can be improved. The existing
> implementation uses a new {{CircuitBreaker}} for each
> {{ConnectionStateListener}} set in a Curator client. It turns out that this
> is not ideal. Instead, a shared {{CircuitBreaker}} should be used per Curator
> client.
> Unfortunately, the best way to do this is to remove the
> {{ConnectionStateListenerDecorator}} semantics and use a different mechanism.
> This Issue proposes to do this and remove
> {{ConnectionStateListenerDecorator}}. This is a breaking change but given the
> short amount of time it's been in Curator it's unlikely that it's been widely
> adopted.
> If the community considers a breaking change too harsh the older classes can
> be maintained for a while and marked as {{@Deprecated}}.
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