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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7444) Add Checksum API to verify and calculate checksums "in bulk"
Date Wed, 06 Jul 2011 04:42:16 GMT
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

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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