Useful when distcp needs to access 2 Data Lake stores with different SPIs.
Of course, a workaround is to grant the same SPI access permission to both stores, but sometimes it might not be feasible.
One idea is to embed the store name in the configuration property names, e.g., dfs.adls.oauth2.<store>.client.id. Per-store keys will be consulted first, then fall back to the global keys.
|Back port HADOOP-13972 to 2.8.1 and 2.8.3||Resolved|