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From "Scott Carey (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-1282) Make use of the sun.misc.Unsafe class during serialization if a JDK supports it
Date Fri, 26 Apr 2013 05:36:16 GMT

     [ https://issues.apache.org/jira/browse/AVRO-1282?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Carey updated AVRO-1282:
------------------------------

    Attachment: AVRO-1282-s3.patch

This patch brings the performance back up a little, but it is still slightly below the prior
level due to using a Map<String, FieldAccessor> instead of FieldAccessor[].

There are a couple other simplifications.

The read side is particularly slow for both arrays and fields -- there is room for improvement
in how the array read machinery works.

I'm likely done with my main burst of activity on this ticket for now -- feel free to pick
up where I've left off and experiment more.

All tests are passing, but I think we should add some more tests to cover more corner cases
before committing any of these variations -- this stuff is a little dangerous.

Latly, My patch does not contain all of Leo's changes to Perf.java -- please submit another
patch for that; I can't seem to get the latest one uploaded to work.
                
> Make use of the sun.misc.Unsafe class during serialization if a JDK supports it
> -------------------------------------------------------------------------------
>
>                 Key: AVRO-1282
>                 URL: https://issues.apache.org/jira/browse/AVRO-1282
>             Project: Avro
>          Issue Type: Improvement
>          Components: java
>    Affects Versions: 1.7.4
>            Reporter: Leo Romanoff
>            Priority: Minor
>         Attachments: AVRO-1282-s1.patch, AVRO-1282-s2.patch, AVRO-1282-s3.patch, avro-1282-v1.patch,
avro-1282-v2.patch, avro-1282-v3.patch, avro-1282-v4.patch, avro-1282-v5.patch, avro-1282-v6.patch,
avro-1282-v7.patch, avro-1282-v8.patch, TestUnsafeUtil.java
>
>
> Unsafe can be used to significantly speed up serialization process, if a JDK implementation
supports java.misc.Unsafe properly. Most JDKs running on PCs support it. Some platforms like
Android lack a proper support for Unsafe yet.
> There are two possibilities to use Unsafe for serialization:
> 1) Very quick access to the fields of objects. It is way faster than with the reflection-based
approach using Field.get/set
> 2) Input and Output streams can be using Unsafe to perform very quick input/output.
>  
> 3) More over, Unsafe makes it possible to serialize to/deserialize from off-heap memory
directly and very quickly, without any intermediate buffers allocated on heap. There is virtually
no overhead compared to the usual byte arrays.

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