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https://issues.apache.org/jira/browse/HDDS-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elek, Marton updated HDDS-1089:
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Attachment: (was: HDDS-1089.001.patch)
> 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
> Priority: Major
>
> 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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