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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7758) Retire FsDatasetSpi#getVolumes() and use FsDatasetSpi#getVolumeRefs() instead
Date Tue, 10 Feb 2015 01:34:35 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lei (Eddy) Xu updated HDFS-7758:
--------------------------------
    Attachment: HDFS-7758.000.patch

Upload the patch to make {{FsDatasetImpl#getVolumes()}} as a private function and change all
callers of it to use {{FsDatasetSpi#getVolumeRefs()}} or {{FsDatasetSpi#getVolumeRef(idx)}}.



> Retire FsDatasetSpi#getVolumes() and use FsDatasetSpi#getVolumeRefs() instead
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-7758
>                 URL: https://issues.apache.org/jira/browse/HDFS-7758
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.6.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>         Attachments: HDFS-7758.000.patch
>
>
> HDFS-7496 introduced reference-counting  the volume instances being used to prevent race
condition when hot swapping a volume.
> However, {{FsDatasetSpi#getVolumes()}} can still leak the volume instance without increasing
its reference count. In this JIRA, we retire the {{FsDatasetSpi#getVolumes()}} and propose
{{FsDatasetSpi#getVolumeRefs()}} and etc. method to access {{FsVolume}}. Thus it makes sure
that the consumer of {{FsVolume}} always has correct reference count.



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