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https://issues.apache.org/jira/browse/DIRMINA-764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833811#action_12833811
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Emmanuel Lecharny commented on DIRMINA-764:
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The read is blocking, so I guess it reads as soon as something returns...
The network is fast enough, hopefully, as I ran the test locally !
Also the messages are 9 bytes long. No need of extra large buffers here :/
I think there is a huge problem in the way the server handles the channel ready
for write : it seems to send just one single message. I have to check that
though.
> DDOS possible in only a few seconds...
> --------------------------------------
>
> Key: DIRMINA-764
> URL: https://issues.apache.org/jira/browse/DIRMINA-764
> Project: MINA
> Issue Type: Bug
> Affects Versions: 2.0.0-RC1
> Reporter: Emmanuel Lecharny
> Priority: Blocker
> Fix For: 2.0.0
>
> Attachments: screenshot-1.jpg, screenshot-2.jpg
>
>
> We can kill a server in just a few seconds using the stress test found in
> DIRMINA-762.
> If we inject messages with no delay, using 50 threads to do that, the
> ProtocolCodecFilter$MessageWriteRequest is stuffed with hundred of thousands
> messages waiting to be written back to the client, with no success.
> On the client side, we receive almost no messages :
> 0 messages/sec (total messages received 1)
> 2 messages/sec (total messages received 11)
> 8 messages/sec (total messages received 55)
> 8 messages/sec (total messages received 95)
> 9 messages/sec (total messages received 144)
> 3 messages/sec (total messages received 162)
> 1 messages/sec (total messages received 169)
> ...
> On the server side, the memory is totally swamped in 20 seconds, with no way
> to recover :
> Exception in thread "pool-1-thread-1" java.lang.OutOfMemoryError: Java heap
> space
> (see graph attached)
> On the server, ConcurrentLinkedQueue contain the messages to be written (in
> my case, 724 499 Node are present). There are also 361629
> DefaultWriteRequests, 361628 DefaultWriteFutures, 361625 SimpleBuffer, 361
> 618 ProtocolCodecFilter$MessageWriteRequest and 361 614
> ProtocolCodecFilter$EncodedWriteRequests.
> That mean we don't flush them to the client at all.
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