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From "Yisong Yue (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-3063) track outstanding changes with ArrayDeque
Date Wed, 13 Jun 2018 20:46:00 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-3063?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yisong Yue updated ZOOKEEPER-3063:
----------------------------------
    Description: 
Outstanding changes are tracked with an ArrayList, which has O(N) remove from head (and possibly
add) performance. This means that as we get further behind, we will slow down the processing
of outstanding changes, which would make us get further behind.
 We should switch to using ArrayDeque which achieves O(1) add and remove on both ends,
which should result in much happiness.

  was:
Outstanding changes are tracked with an ArrayList, which has O(n) remove from head (and possibly
add) performance. This means that as we get further behind, we will slow down the processing
of outstanding changes, which would make us get further behind.
We should switch to using ArrayDeque which achieves O(1) add and remove on both ends, which
should result in much happiness.


> track outstanding changes with ArrayDeque
> -----------------------------------------
>
>                 Key: ZOOKEEPER-3063
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3063
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: Yisong Yue
>            Assignee: Yisong Yue
>            Priority: Trivial
>             Fix For: 3.6.0
>
>
> Outstanding changes are tracked with an ArrayList, which has O(N) remove from head (and
possibly add) performance. This means that as we get further behind, we will slow down the
processing of outstanding changes, which would make us get further behind.
>  We should switch to using ArrayDeque which achieves O(1) add and remove on both ends,
which should result in much happiness.



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