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From "Andrus Adamchik (Issue Comment Edited) (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (CAY-1680) Get rid of shared locks in DataDomain metadata lookups
Date Thu, 01 Mar 2012 08:23:58 GMT

    [ https://issues.apache.org/jira/browse/CAY-1680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13219886#comment-13219886
] 

Andrus Adamchik edited comment on CAY-1680 at 3/1/12 8:22 AM:
--------------------------------------------------------------

Some interesting data points on ConcurrentHashMap vs HashMap:

http://www.informit.com/guides/content.aspx?g=java&seqNum=246
http://gregluck.com/blog/archives/2009/06/performance-problems-in-concurrenthashmap-vs-synchronized-hashmap/

These are showing the performance hits taken as a tradeoff for concurrency. Appears to be
an issue with large maps only.
                
      was (Author: andrus):
    also using async access to DataDomain.nodes map
                  
> Get rid of shared locks in DataDomain metadata lookups
> ------------------------------------------------------
>
>                 Key: CAY-1680
>                 URL: https://issues.apache.org/jira/browse/CAY-1680
>             Project: Cayenne
>          Issue Type: Improvement
>          Components: Core Library
>    Affects Versions: 3.1M3
>            Reporter: Andrus Adamchik
>            Assignee: Andrus Adamchik
>             Fix For: 3.1M4
>
>
> We can improve performance by using concurrent collections instead of synchronizing the
HashMap. This includes: 
> DataDomain.properties 
> DataDomain.nodes
> DataDomain.nodesByDataMapName
> Also instead of reindexing on failed lookups, we can simply lazy-fill collection from
a given DataMap

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