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From "Dmitry Chuyko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-15033) Use java.util.zip.CRC32C for Java 9 and above
Date Mon, 13 Nov 2017 09:50:00 GMT
Dmitry Chuyko created HADOOP-15033:
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             Summary: Use java.util.zip.CRC32C for Java 9 and above
                 Key: HADOOP-15033
                 URL: https://issues.apache.org/jira/browse/HADOOP-15033
             Project: Hadoop Common
          Issue Type: Improvement
          Components: performance, util
            Reporter: Dmitry Chuyko


java.util.zip.CRC32C implementation is available since Java 9.
https://docs.oracle.com/javase/9/docs/api/java/util/zip/CRC32C.html
Platform specific assembler intrinsics make it more aeefective than any pure Java implementation.

Hadoop is compiled against Java 8 but class constructor may be accessible with method handle
on 9 to instances implementing Checksum in runtime.



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