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

[Rajesh Jangam (JIRA)]

Rajesh Jangam created ISPN-3877:
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             Summary: 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: Mircea Markus


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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