elek opened a new pull request #501: HDDS-1089. Disable OzoneFSStorageStatistics for hadoop versions older than 2.8 URL: https://github.com/apache/hadoop/pull/501 HDDS-1033 introduced OzoneFSStorageStatistics for OzoneFileSystem. It uses the StorageStatistics which is introduced in HADOOP-13065 (available from the hadoop2.8/3.0). Using older hadoop (for example hadoop-2.7 which is included in the spark distributions) is not possible any more even with using the isolated class loader (introduced in HDDS-922). Fortunately it can be fixed: # We can support null in storageStatistics field with checking everywhere before call it. # We can create a new constructor of OzoneClientAdapterImpl without using OzoneFSStorageStatistics): If OzoneFSStorageStatistics is not in the method/constructor signature we don't need to load it. # We can check the availability of HADOOP-13065 and if the classes are not in the classpath we can skip the initialization of the OzoneFSStorageStatistics See: https://issues.apache.org/jira/browse/HDDS-1089
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