[infinispan-issues] [JBoss JIRA] (ISPN-3877) Disk Space optimizations for SingleFileStore

[Mircea Markus (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-3877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934662#comment-12934662 ] 

Mircea Markus commented on ISPN-3877:
-------------------------------------

Thanks for the patch Rajesh, will take a look!
                
> Disk Space optimizations for SingleFileStore
> --------------------------------------------
>
>                 Key: ISPN-3877
>                 URL: https://issues.jboss.org/browse/ISPN-3877
>             Project: Infinispan
>          Issue Type: Patch
>          Components: Loaders and Stores
>    Affects Versions: 6.0.0.Final
>         Environment: Oracle JDK 1.7, Windows Server 2008 R2 x64
>            Reporter: Rajesh Jangam
>            Assignee: Galder Zamarreño
>
> We are testing the latest Infinispan 6.0 SingleFileStore version for our application.
> We tend to create a lot of entries in the store and remove them when not required.
> However, what we have observed is that the size of the file keeps on increasing as more data is being added/removed and that it does not get reclaimed.
>  
> This was not seen with earlier versions like 5.3.0. There the size of the cache folder would reduce as entries got removed.
> We have attempted to create a fix for this issue and tested it in our environment. It keeps the space usage under control as compared to the original implementation.
> The proposed fix is twofold:
> 1. Truncates the file if there are free fileentries at the end of the data file.
> 2. Coalesces consecutive free fileentries into one so that the probability of finding a free file entry capable enough to contain a newly added key-value pair increases.
> Please review this diff and let us know your opinion

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