Examples with BlockStoragePolicySuite org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite used on opensource projects

Example 16 with BlockStoragePolicySuite

use of org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite in project hbase by apache.

the class HFileSystem method getStoragePolicyForOldHDFSVersion.

/**
 * Before Hadoop 2.8.0, there's no getStoragePolicy method for FileSystem interface, and we need
 * to keep compatible with it. See HADOOP-12161 for more details.
 * @param path Path to get storage policy against
 * @return the storage policy name
 */
private String getStoragePolicyForOldHDFSVersion(Path path) {
    try {
        if (this.fs instanceof DistributedFileSystem) {
            DistributedFileSystem dfs = (DistributedFileSystem) this.fs;
            HdfsFileStatus status = dfs.getClient().getFileInfo(path.toUri().getPath());
            if (null != status) {
                if (unspecifiedStoragePolicyId < 0) {
                    // Get the unspecified id field through reflection to avoid compilation error.
                    // In later version BlockStoragePolicySuite#ID_UNSPECIFIED is moved to
                    // HdfsConstants#BLOCK_STORAGE_POLICY_ID_UNSPECIFIED
                    Field idUnspecified = BlockStoragePolicySuite.class.getField("ID_UNSPECIFIED");
                    unspecifiedStoragePolicyId = idUnspecified.getByte(BlockStoragePolicySuite.class);
                }
                byte storagePolicyId = status.getStoragePolicy();
                if (storagePolicyId != unspecifiedStoragePolicyId) {
                    BlockStoragePolicy[] policies = dfs.getStoragePolicies();
                    for (BlockStoragePolicy policy : policies) {
                        if (policy.getId() == storagePolicyId) {
                            return policy.getName();
                        }
                    }
                }
            }
        }
    } catch (Throwable e) {
        LOG.warn("failed to get block storage policy of [" + path + "]", e);
    }
    return null;
}