[jira] [Resolved] (FELIX-6529) Improve memory usage ManifestParser using String deduplication

["Karl Pauls (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FELIX-6529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karl Pauls resolved FELIX-6529.
-------------------------------
    Resolution: Fixed

I merged my PR - [~amitmondal], I hope it helps in your case too (it does reduce memory usage for at least one example case I did).

> Improve memory usage ManifestParser using String deduplication
> --------------------------------------------------------------
>
>                 Key: FELIX-6529
>                 URL: https://issues.apache.org/jira/browse/FELIX-6529
>             Project: Felix
>          Issue Type: Improvement
>            Reporter: Johannes Edmeier
>            Assignee: Karl Pauls
>            Priority: Major
>             Fix For: framework-7.0.4
>
>         Attachments: ManifestParser.patch, image-2022-05-13-14-16-39-509.png, image-2022-05-13-14-17-55-965.png
>
>
> In my heap dump I've seen a lot of duplicate Strings produced by the ManifestParser.
> It creates a lot of equal strings for the keys in the manifest but doesn't deduplicate them and they're hold forever producing a lot on retained heap.
> I've patched the ManifestParser to deduplicate just the keys and could save ~8 Megs of heap.
> Total usage before: 38MB after: 30MB
> Duplicated Strings before:
> !image-2022-05-13-14-16-39-509.png|width=658,height=203!
> Duplicated Strings after:
> !image-2022-05-13-14-17-55-965.png|width=793,height=200!
> See patch attached.



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