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https://issues.apache.org/jira/browse/HADOOP-14154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16574200#comment-16574200
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Aaron Fabbri commented on HADOOP-14154:
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Attached a tiny patch and script (perf-eval-v1.diff and run-dir-perf-test.sh) I
used to take some performance measurements today. I ran it on my laptop from
home. Results may look better actually running in AWS since the WAN latency
goes away (thus dynamo latency speedup is larger), if you want to try that.
This also made me realize some metrics around (1) hit rate for dir listings
(when we skip s3 list) and (2) hit rate for listStatus() writeback (it skips
writing listing back to dynamo if nothing changed). We could do this in a
future JIRA.
> 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, HADOOP-14154.001.patch, HADOOP-14154.002.patch,
> HADOOP-14154.003.patch, perf-eval-v1.diff, run-dir-perf-itest.sh
>
>
> 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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