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This patch adds support for huawei OBS (Object Storage Service) FileSystem. The implementation is similar to other remote FileSystems. New flags for OBS: - num_obs_io_threads: Number of OBS I/O threads. Defaults to be 16. Testing: - Upload hdfs test data to an OBS bucket. Modify all locations in HMS DB to point to the OBS bucket. Remove some hdfs caching params. Run CORE tests. Change-Id: I84a54dbebcc5b71e9bcdd141dae9e95104d98cb1 Reviewed-on: http://gerrit.cloudera.org:8080/19110 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>