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https://issues.apache.org/jira/browse/HDFS-11779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16027511#comment-16027511
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Weiwei Yang commented on HDFS-11779:
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Hello [~xyao] and [~anu]
V7 patch contains following changes
bq. Nullable and Nonnull annotations
Removed from v7 patch.
bq. BucketManagerImpl.java: Check if this value is greater than 0 ?
maxNumOfBuckets
Add a check in {{DistributedStorageHandler#listBuckets}} to check make sure the
{{maxKey}} value is in range (0, 1024), the max value defined in
{{OzoneConsts#MAX_LISTBUCKETS_SIZE}}.
bq. KeySpaceManager.java: catch (Exception ex) ==> should this be IOException
Fixed.
bq. MetadataManagerImpl.java: Just a meta-comment – getVolumeBucket I don't
want to change this code in this patch, but I would like to formalize all these
parsing assumptions in one single class.
Removed {{getVolumeBucket}}, it is no longer needed in latest patch.
bq. Would you not be able to collapse this into a single filter.
Yes, I've done this in latest patch in a single filter.
bq. DistributedStorageHandler.java Line 272: To avoid overflow, we might
consider enforce paging by having a default MaxKeys per list request (say 100)
if the MaxKeys is not specified in the request. If the caller really want to
listAll, they can specify the MaxKeys with a negative value (like -1).
Per Anu's comment, I have added a check to make sure a request can only
retrieve 0 ~ 1024 number of buckets per request. End user is not able to
retrieve all buckets once by providing a negative number. This should be enough
for user and also safer.
bq. ResultCodes.FAILED_VOLUME_NOT_FOUND ==> VOLUME_NOT_FOUND
This is the only one comment I did not address in latest patch. Via HDFS-11769,
{{KSMException}} was added to KSM to wrap up server side exceptions, and
{{KeySpaceManagerProtocolServerSideTranslatorPB}} convert the exception into
{{ListBucketsResponse}} which contains a {{Status}} info. Then
{{KeySpaceManagerProtocolServerClientTranslatorPB}} parses the {{Status}} info
and throws an IOException. If we want to change this manner, there is a lot of
places to change. Looks like this needs some more work to get it consistent
every where.
Thanks
> Ozone: KSM: add listBuckets
> ---------------------------
>
> Key: HDFS-11779
> URL: https://issues.apache.org/jira/browse/HDFS-11779
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Anu Engineer
> Assignee: Weiwei Yang
> Attachments: HDFS-11779-HDFS-7240.001.patch,
> HDFS-11779-HDFS-7240.002.patch, HDFS-11779-HDFS-7240.003.patch,
> HDFS-11779-HDFS-7240.004.patch, HDFS-11779-HDFS-7240.005.patch,
> HDFS-11779-HDFS-7240.006.patch
>
>
> Lists buckets of a given volume. Similar to listVolumes, paging supported via
> prevKey, prefix and maxKeys.
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