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There is a branch-2 patch attached to HDFS-13056.
We should consider backporting the feature into Hadoop 2. If not 2.8, then 2.10 the least.
Backport of HDFS-13056 to the 2.9 branch: "Expose file-level composite CRCs in HDFS"
Expose file-level composite CRCs in HDFS which are comparable across different instances/layouts