[
https://issues.apache.org/jira/browse/CASSANDRA-2820?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Paul Loy updated CASSANDRA-2820:
--------------------------------
Attachment: fast_bytearray_iostreams_harmony-patch-3.txt
This patch has:
* FastByteArrayIn/OutputStream impls that extend the base Harmony versions.
* Same formatting of the Fast versions and the Harmony version for easy
diffing if Harmony bug fixes need to be applied.
* A full carbon-copy of Harmony code to ensure cross-JRE support.
* Other import changes (eclipse CTRL+SHIFT+Os) reverted.
> 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,
> fast_bytearray_iostreams_harmony-patch-3.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.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
