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From "Peter Lawrey (JIRA)" <j...@apache.org>
Subject [jira] Commented: (FELIX-2436) Reduce the number files created by the fileinstall Scanner.
Date Wed, 23 Jun 2010 14:15:50 GMT

    [ https://issues.apache.org/jira/browse/FELIX-2436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881701#action_12881701

Peter Lawrey commented on FELIX-2436:

Using the last modified date of the directory cut the objects created to 1/65th of what it
was. ( from 40% of objects to 0.6%)  

For my usecase, most changes involve files being removed or add and the rest of the time I
can do a "touch ."

> Reduce the number files created by the fileinstall Scanner.
> -----------------------------------------------------------
>                 Key: FELIX-2436
>                 URL: https://issues.apache.org/jira/browse/FELIX-2436
>             Project: Felix
>          Issue Type: Improvement
>          Components: File Install
>    Affects Versions: fileinstall-2.0.8
>            Reporter: Peter Lawrey
>         Attachments: reduce_object_construction.patch
> The fileinstaller is called regularly and there can be two or more instances in a server.
> However its object allocation doesn't considered that 99.999+% of the time none of the
files change. 
> (polling one per second and changing files once per day is means the file installer will
see a change 0.001% of the time)
> In our application, polling every second results in the Scanner creating more objects
than the application itself. We can turn down the polling rate but even at once every 10s
it creates more objects than any other component!
> For this reason I have changed the Scanner to first check whether any files have changed
attempting to compute what has changed.
> See atached for a patch of the changes.  This reduces the number of obejcts created by
atleast a factor of 3.

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