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https://issues.apache.org/jira/browse/HDFS-7758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lei (Eddy) Xu updated HDFS-7758:
--------------------------------
Attachment: HDFS-7758.002.patch
Updated the patch to use a {{ReferredFsVolumeList}} to replace
{{FsVolumeSpi#getVolumeRefs()}} and {{FsVolumeSpi#getVolumeRef(index)}}:
{code}
public static interface ReferredFsVolumeList
extends Iterable<FsVolumeSpi>, Closeable {
/** Get the number of volumes. */
public int size();
/** Get the volume for a given index. */
public FsVolumeSpi get(int index);
}
{code}
> 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-7758.001.patch,
> HDFS-7758.002.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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