He Tianyi created HDFS-10331:
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Summary: Use java.util.zip.CRC32 for checksum in java8 or above
Key: HDFS-10331
URL: https://issues.apache.org/jira/browse/HDFS-10331
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode, hdfs, hdfs-client
Affects Versions: 2.6.0
Reporter: He Tianyi
In java8, performance of intrinsic CRC32 has been dramatically improved.
See: https://bugs.openjdk.java.net/browse/JDK-7088419
I carried an in-memory benchmark of throughput, on a server with two E5-2630 v2
cpus, results:
java7 java.util.zip.CRC32: 0.81GB/s
hdfs DataChecksum, native: 1.46GB/s
java8 java.util.zip.CRC32: 2.39GB/s
hdfs DataChecksum, CRC32 on java8: 2.39GB/s
IMHO I think we could either:
A) provide a configuration for user to switch CRC32 implementations;
or B) On java8 or above, always use intrinsic CRC32.
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