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https://issues.apache.org/jira/browse/HAMA-559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488511#comment-13488511
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Thomas Jungblut commented on HAMA-559:
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Yeah! Nice work!
Mind sharing some code? I hope I get my SSD up and running soon, we'll see how
much improvement your buffers yield on it.
> Add a spilling message queue
> ----------------------------
>
> Key: HAMA-559
> URL: https://issues.apache.org/jira/browse/HAMA-559
> Project: Hama
> Issue Type: Sub-task
> Components: bsp core
> Affects Versions: 0.5.0
> Reporter: Thomas Jungblut
> Assignee: Suraj Menon
> Priority: Minor
> Fix For: 0.7.0
>
> Attachments: HAMA-559.patch-v1,
> spilling_buffer_cpu_usage_text_write.png,
> SpillingBufferProfile-2012-10-27.snapshot,
> spilling_buffer_profile_cpu_graph_test_write.png,
> spilling_buffer_profile_cpugraph_writeUTF.png,
> spillingbuffer_profile_cpu_writeUTF.png, spilling_buffer_profile_LOCK.JPG,
> spilling_buffer_profile_timesplit_text_write.png,
> spilling_buffer_profile_writeUTF.png
>
>
> After HAMA-521 is done, we can add a spilling queue which just holds the
> messages in RAM that fit into the heap space. The rest can be flushed to disk.
> We may call this a HybridQueue or something like that.
> The benefits should be that we don't have to flush to disk so often and get
> faster. However we may have more GC so it is always overall faster.
> The requirements for this queue also include:
> - The message object once written to the queue (after returning from the
> write call) could be modified, but the changes should not be reflected in the
> messages stored in the queue.
> - For now let's implement a queue that does not support concurrent reading
> and writing. This feature is needed when we implement asynchronous
> communication.
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