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https://issues.apache.org/jira/browse/CASSANDRA-2820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054390#comment-13054390
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Jonathan Ellis commented on CASSANDRA-2820:
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bq. this does not always conform to http://wiki.apache.org/cassandra/CodeStyle
FWIW I would advocate code copied from Harmony with limited, surgical changes
to keep the Harmony style, with a comment as to their origin. If we start
making deeper changes then I would want it to be our style though.
> Re-introduce FastByteArrayInputStream (and Output equivalent)
> -------------------------------------------------------------
>
> Key: CASSANDRA-2820
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2820
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 0.8.0
> Environment: n/a
> Reporter: Paul Loy
> Priority: Minor
> Labels: bytearrayinputstream, bytearrayoutputstream, license,
> synchronized
> Attachments: fast_bytearray_iostreams_harmony-patch-2.txt
>
>
> In https://issues.apache.org/jira/browse/CASSANDRA-37
> FastByteArrayInputStream and FastByteArrayOutputStream were removed due to
> being code copied from the JDK and then subsequently modified. The JDK
> license is incompatible with Apache 2 license so the code had to go.
> I have since had a look at the performance of the JDK ByteArrayInputStream
> and a FastByteArrayInputStream (i.e. one with synchronized methods made
> un-synchronized) and seen the difference is significant.
> After a warmup-period of >10000 loops I get the following for 10000 loops
> through a 128000 byte array:
> bais : 3513ms
> fbais: 72ms
> This varies depending on the OS, machine and Java version, but it's always in
> favour of the FastByteArrayInputStream as you might expect.
> Then, at Jonathan Ellis' suggestion, I tried this using a modified Apache
> Harmony ByteArrayInputStream - i.e. one whose license is compatible - and the
> results were the same. A significant boost.
> I will attach a patch with changes for the 0.8.0 tag.
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