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https://issues.apache.org/jira/browse/HDDS-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16776423#comment-16776423
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Hudson commented on HDDS-1089:
------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #16050 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/16050/])
HDDS-1089. Disable OzoneFSStorageStatistics for hadoop versions older
(aengineer: rev 236b105e415e4a10799b366a0d5a2d8b0b05a909)
* (edit)
hadoop-ozone/ozonefs/src/main/java/org/apache/hadoop/fs/ozone/OzoneClientAdapterFactory.java
* (edit)
hadoop-ozone/ozonefs/src/main/java/org/apache/hadoop/fs/ozone/OzoneClientAdapterImpl.java
* (edit)
hadoop-ozone/ozonefs/src/main/java/org/apache/hadoop/fs/ozone/OzoneFileSystem.java
> 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
> Fix For: 0.4.0
>
> 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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