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  1. Hadoop HDFS
  2. HDFS-16677

Add OP_SWAP_BLOCK_LIST as an operation code in FSEditLogOpCodes.

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      Copy from HDFS-15006

      InĀ HDFS-14989, we add a new Namenode operation "swapBlockList" to replace the set of blocks in an INode File with a new set of blocks. This JIRA will track the effort to add an FS Edit log op to persist this operation.

      We also need to increase the NamenodeLayoutVersion for this change.

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