[infinispan-issues] [JBoss JIRA] (ISPN-1383) Data caching multiplying memory requirements of Hot Rod server

[Galder Zamarreño (Commented) (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-1383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12634795#comment-12634795 ] 

Galder Zamarreño commented on ISPN-1383:
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To clarify, what has been discovered here is two things:
- HotRodDecoder was keeping references to last stored value which was unnecessary once data had been stored.
- The Netty replaying decoder internal buffer maintained a ever-growing buffer of data read which made server side memory consumption duplicate. This is now trimmed.
                
> Data caching multiplying memory requirements of Hot Rod server
> --------------------------------------------------------------
>
>                 Key: ISPN-1383
>                 URL: https://issues.jboss.org/browse/ISPN-1383
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Cache Server
>    Affects Versions: 5.0.1.FINAL
>            Reporter: Galder Zamarreño
>            Assignee: Galder Zamarreño
>              Labels: hotrod, netty
>             Fix For: 5.1.0.BETA2, 5.1.0.FINAL
>
>         Attachments: ByteArrayConsumption.jpg, NettyBufferPathtToGC.jpg
>
>
> After inserting a 160MB object in Hot Rod, the memory consumption of the server goes through the roof. The screenshot shows a couple of interesting things:
> 1. Both the HotRodDecoder and the DataContainer have a byte[] of approx 160mb each. So, it seems like it's actually two copies of the same byte[]. It's clear though that only the cache container should have it, and any cache decoder data should be cleared when the request is completed.
> 2. Netty's UnsafeDynamicChannelBuffer is still holding to a byte[] of 268MB approx. Judging by the 2nd screenshot attached, this appears to be belonging to the underlying ReplayingDecoder. That should also, if possible, be cleared up. I'll have a look around in the Netty code and maybe ping Trustin.

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