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https://issues.apache.org/jira/browse/HADOOP-7444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HADOOP-7444:
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Attachment: hadoop-7444.txt
- fixed the redundant casts and bitmasks, thanks
- left the Math.min call, since it actually is a VM intrinsic in hotspot:
http://google.com/codesearch#NZZBPLyUxqs/src/share/vm/opto/library_call.cpp&q=hotspot%20intrinsics%20min&type=cs&l=1499
> Add Checksum API to verify and calculate checksums "in bulk"
> ------------------------------------------------------------
>
> Key: HADOOP-7444
> URL: https://issues.apache.org/jira/browse/HADOOP-7444
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hadoop-7444.txt, hadoop-7444.txt, hadoop-7444.txt
>
>
> Currently, the various checksum types only provide the capability to
> calculate the checksum of a range of a byte array. For HDFS-2080, it's
> advantageous to provide an API that, given a buffer with some number of
> "checksum chunks", can either calculate or verify the checksums of all of the
> chunks. For example, given a 4KB buffer and a 512-byte chunk size, it would
> calculate or verify 8 CRC32s in one call.
> This allows efficient JNI-based checksum implementations since the cost of
> crossing the JNI boundary is amortized across many computations.
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