[jira] [Created] (HDDS-1089) Disable OzoneFSStorageStatistics for hadoop versions older than 2.8

["Elek, Marton (JIRA)" <ji...@apache.org>]

Elek, Marton created HDDS-1089:
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             Summary: Disable OzoneFSStorageStatistics for hadoop versions older than 2.8
                 Key: HDDS-1089
                 URL: https://issues.apache.org/jira/browse/HDDS-1089
             Project: Hadoop Distributed Data Store
          Issue Type: Improvement
          Components: Ozone Filesystem
            Reporter: Elek, Marton
            Assignee: Elek, Marton


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



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