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https://issues.apache.org/jira/browse/HADOOP-13055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manoj Govindassamy updated HADOOP-13055:
----------------------------------------
Attachment: HADOOP-13055.08.patch
Thanks for the review comments [~eddyxu]. Attached v08 patch addressing your
review comments. Please take a look.
bq. Can you add more comments here to clarify what is the concept of internal
dir, ..
Done.
bq. SINGLE_FALLBACK, MERGE_SLASH, Can you add more comments on both of them?
What is the difference?
Done.
bq. How to guarantee that there is at most one LinkType.SINGLE_FALLBACK
instance.
{{INodeTree#INodeDir#setRootFallbackLink}}
{noformat}
void setRootFallbackLink(INodeLink<T> fallbackLink) {
Preconditions.checkState(isRoot());
Preconditions.checkState(getRootFallbackLink() == null);
this.rootFallbackLink = fallbackLink;
}
{noformat}
The above Precondition allows only one link fallback for the mount table link
entries.
> Implement linkMergeSlash for ViewFileSystem
> -------------------------------------------
>
> Key: HADOOP-13055
> URL: https://issues.apache.org/jira/browse/HADOOP-13055
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs, viewfs
> Affects Versions: 2.7.5
> Reporter: Zhe Zhang
> Assignee: Manoj Govindassamy
> Attachments: HADOOP-13055.00.patch, HADOOP-13055.01.patch,
> HADOOP-13055.02.patch, HADOOP-13055.03.patch, HADOOP-13055.04.patch,
> HADOOP-13055.05.patch, HADOOP-13055.06.patch, HADOOP-13055.07.patch,
> HADOOP-13055.08.patch
>
>
> In a multi-cluster environment it is sometimes useful to operate on the root
> / slash directory of an HDFS cluster. E.g., list all top level directories.
> Quoting the comment in {{ViewFs}}:
> {code}
> * A special case of the merge mount is where mount table's root is merged
> * with the root (slash) of another file system:
> * <ul>
> * <li> fs.viewfs.mounttable.default.linkMergeSlash=hdfs://nn99/
> * </ul>
> * In this cases the root of the mount table is merged with the root of
> * <b>hdfs://nn99/ </b>
> {code}
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