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From "Elek, Marton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDDS-1089) Disable OzoneFSStorageStatistics for hadoop versions older than 2.8
Date Tue, 19 Feb 2019 14:23:00 GMT

    [ https://issues.apache.org/jira/browse/HDDS-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16771959#comment-16771959
] 

Elek, Marton commented on HDDS-1089:
------------------------------------

Patch is rebased + javadoc fix is added.

> 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
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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