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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14154) Persist isAuthoritative bit in DynamoDBMetaStore (authoritative mode support)
Date Thu, 26 Jul 2018 17:34:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16558656#comment-16558656
] 

Aaron Fabbri commented on HADOOP-14154:
---------------------------------------

{quote}
As my current understanding using a dynamodb table is exclusive per ddbms, so there should
be no case when the same table gets modified by an old and a new metadata store version at
the same time.
{quote}
Customers often share a single dynamo table between multiple clusters (it is required if they
modify the same bucket).  I would actually expect multiple versions to concurrently access
the same table.  Seems like we should try to allow it unless there is a good reason to break
compatibility.

> Persist isAuthoritative bit in DynamoDBMetaStore (authoritative mode support)
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-14154
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14154
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.0.0-beta1
>            Reporter: Rajesh Balamohan
>            Assignee: Gabor Bota
>            Priority: Minor
>         Attachments: HADOOP-14154-HADOOP-13345.001.patch, HADOOP-14154-HADOOP-13345.002.patch,
HADOOP-14154-spec-001.pdf, HADOOP-14154-spec-002.pdf
>
>
> Add support for "authoritative mode" for DynamoDBMetadataStore.
> The missing feature is to persist the bit set in {{DirListingMetadata.isAuthoritative}}. 
> This topic has been super confusing for folks so I will also file a documentation Jira
to explain the design better.
> We may want to also rename the DirListingMetadata.isAuthoritative field to .isFullListing
to eliminate the multiple uses and meanings of the word "authoritative".
>  



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