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https://issues.apache.org/jira/browse/HADOOP-15033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16296841#comment-16296841
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ASF GitHub Bot commented on HADOOP-15033:
-----------------------------------------
Github user dchuyko commented on a diff in the pull request:
https://github.com/apache/hadoop/pull/291#discussion_r157763644
--- Diff:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/DataChecksum.java
---
@@ -70,6 +74,24 @@ public static Type valueOf(int id) {
}
}
+ private static final MethodHandle NEW_CRC32C_MH;
+ static {
--- End diff --
Agree, logging would go better. I was trying to avoid silent failure here.
> 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
> Affects Versions: 3.0.0
> Reporter: Dmitry Chuyko
> Labels: Java9, common, jdk9
> Attachments: HADOOP-15033.001.patch, HADOOP-15033.001.patch,
> HADOOP-15033.002.patch, HADOOP-15033.003.patch, HADOOP-15033.003.patch,
> HADOOP-15033.004.patch
>
>
> 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 effective 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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