Hi, RS Legacy is pure Java based implementation. Probably you can look at the encoding/decoding logic at github repo https://github.com/Jerry-Xin/hadoop/blob/master/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/rawcoder/RSRawEncoderLegacy.java
https://github.com/Jerry-Xin/hadoop/blob/master/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/rawcoder/RSRawDecoderLegacy.java RS codec, uses a native implementation which leverages Intel ISA-L library to improve the performance of codec. Please go through below links to get more details on ISA-L part. https://hadoop.apache.org/docs/r3.0.0/hadoop-project-dist/hadoop-hdfs/HDFSErasureCoding.html#Enable_Intel_ISA-L https://blog.cloudera.com/blog/2019/06/hdfs-erasure-coding-in-production/ Rakesh On Mon, Jul 1, 2019 at 5:56 PM Nazerke S <sn1.naze...@gmail.com> wrote: > Hi, > > > What is the difference between LEGACY-RS-6-3-1024k and RS-6-3-1024k EC > policies? > > >
