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https://issues.apache.org/jira/browse/HADOOP-13449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15668909#comment-15668909
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Mingliang Liu commented on HADOOP-13449:
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When we put {{/a/b/file}}, {{/a/b/}} does not need to be there. MetadataStore
will not enforce this. Either the caller has to pre-create the parent, or she
knows about this and do not make any assumption about it in application. I
agree that the put is a simple request for one exact entry to the metadata
store.
But for {{listStatus()}}, my understanding is that we assume the entry per se
is there. Or else, if we query the DDB and no entries having parent as this
path, is the directory nonexistent, or the directory is empty? DDBMetadataStore
should return DirListingMetadata accordingly. Thanks,
> S3Guard: Implement DynamoDBMetadataStore.
> -----------------------------------------
>
> Key: HADOOP-13449
> URL: https://issues.apache.org/jira/browse/HADOOP-13449
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Reporter: Chris Nauroth
> Assignee: Mingliang Liu
> Attachments: HADOOP-13449-HADOOP-13345.000.patch,
> HADOOP-13449-HADOOP-13345.001.patch, HADOOP-13449-HADOOP-13345.002.patch,
> HADOOP-13449-HADOOP-13345.003.patch, HADOOP-13449-HADOOP-13345.004.patch
>
>
> Provide an implementation of the metadata store backed by DynamoDB.
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