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https://issues.apache.org/jira/browse/HDFS-14663?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-14663 stopped by Siyao Meng.
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> HttpFS: LISTSTATUS_BATCH does not return batches
> ------------------------------------------------
>
> Key: HDFS-14663
> URL: https://issues.apache.org/jira/browse/HDFS-14663
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: httpfs
> Affects Versions: 3.3.0
> Reporter: Stephen O'Donnell
> Assignee: Siyao Meng
> Priority: Major
>
> The webhdfs protocol supports a LISTSTATUS_BATCH operation where it can
> retrieve the file listing for a large directory in chunks.
> When using the webhdfs service embedded in the namenode, this works as
> expected, but when using HTTPFS, any call to LISTSTATUS_BATCH simply returns
> the entire listing rather than batches, working effectively like LISTSTATUS
> instead.
> This seems to be because HTTPFS falls back to using the method
> org.apache.hadoop.fs.FileSystem#listStatusBatch, which is intended to be
> overridden, but the implementation used in HTTPFS has not done that, leading
> to this limitation.
> This feature (LISTSTATUS_BATCH) was added to HTTPFS by HDFS-10823, but based
> on my testing it does not work as intended. I suspect it is because the
> listStatusBatch operation was added to the WebHdfsFileSystem and
> HttpFSFileSystem as part of the above Jira, but behind the scenes HTTPFS
> seems to use DistributeFileSystem and hence it falls back to the default
> implementation "org.apache.hadoop.fs.FileSystem#listStatusBatch" which
> returns all entries in a single batch.
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