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https://issues.apache.org/jira/browse/AVRO-1282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13643541#comment-13643541
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Leo Romanoff commented on AVRO-1282:
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Scott, this is great! Question: If you index indexes against Schemas and the
same schema is used for two different classes with different structure in
memory, what would happen?
Regarding IndexedRecords: Have a look at my latest patch and take the class
GenericRecordAccessor for it (the name was not quite reflecting what it does.
In principle it can work also with IndexedRecords). It does almost what you
need. The only differences is that it uses a name instead of a position and
GenericRecord. So, you can easily change it to take position as constructor
argument and use it for access. And you change it to use IndexedRecord. That's
it.
> 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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