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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