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From "Emmanuel Lecharny (JIRA)" <>
Subject [jira] Commented: (DIRSERVER-731) Streaming big objects
Date Sat, 18 Aug 2007 04:22:30 GMT


Emmanuel Lecharny commented on DIRSERVER-731:

Well, I have thought about implementing such a workaround, and it's not that big (there is
one place where we can do that in the code), but this won't solve any DoS attack, as we must
accept big objects like JpegPhoto. Those kind of object, even if limited to a few hundred
of Kb (!), will still be stored in memory, and can kill the server fast.

However, we can implement this workaround first (let's say it can be done, tests included,
in one day), and start to think about streaming data for 2.0 (I have started a branch for
that, but it's a little bit too old now ...)

> Streaming big objects
> ---------------------
>                 Key: DIRSERVER-731
>                 URL:
>             Project: Directory ApacheDS
>          Issue Type: Improvement
>            Reporter: Emmanuel Lecharny
>            Priority: Critical
>             Fix For: 1.5.1
> We really need to implement a streming of big objects, like JpegPhoto, otherwise the
server can be killed trying to manage them.
> The problem is that they are stored entirely in memory, and this is not an option for
megabytes of data in a JVM. We should find a way to work with MINA to send bytes on the fly
(for instance by packets of 8kb). The very same when we receive huge data : we should store
them somwhere on the disk instead of creating a byte[] large enough to store the data.

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