[infinispan-issues] [JBoss JIRA] Updated: (ISPN-523) reduce Lucene Directory memory usage: store only initialized buffer ranges

[Davide Di Somma (JIRA)]

     [ https://jira.jboss.org/browse/ISPN-523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davide Di Somma updated ISPN-523:
---------------------------------

    Attachment: ISPN-523.patch


I picked your old version, which you reverted, that solved the problem and I noticed that something wrong happened when seek() method was called.
I modified that code and now byte array is resized only when InfinispanIndexOutput is flushing the last chunk.
I also add a test to InfinispanIndexIOTest which verifies that the file content is correct when writing on the file e calls seek() method occasionally.


> reduce Lucene Directory memory usage: store only initialized buffer ranges
> --------------------------------------------------------------------------
>
>                 Key: ISPN-523
>                 URL: https://jira.jboss.org/browse/ISPN-523
>             Project: Infinispan
>          Issue Type: Task
>          Components: Lucene Directory
>            Reporter: Sanne Grinovero
>            Assignee: Sanne Grinovero
>             Fix For: 4.1.0.Final, 5.0.0.BETA1
>
>         Attachments: ISPN-523.patch
>
>
> All buffers created prior to writing a new file chunk are initialized at bufferSize and then stored as-is (as the full buffer);
> In most cases the memory penalty due to unused areas is not noticeable as biggest files are split in several chunks, but the many smallest files containing metadata only are wasting more memory, as only a couple of bytes are used in each.

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