can you attach crc path there? https://issues.apache.org/jira/browse/HDFS-3528Currently it's CPU-intensive for several reasons: 1) It doesn't yet use the native CRC code 2) It makes several unnecessary copies and byte buffer allocations, both in the client and in the DataNodeThere are open JIRAs for these, and I have a preliminary patch which helped a lot, but it hasn't been high priority.
i will finish it.
