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https://issues.apache.org/jira/browse/HADOOP-14154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578007#comment-16578007
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Gabor Bota edited comment on HADOOP-14154 at 8/13/18 9:28 AM:
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I've uploaded the following:
* perf-eval-v2.diff: contains an additional change on top of v1 that will cause
an update on the metadata dir listing. This will not happen in
perf-eval-v1.diff so the measurements will not show the decreased time for
directory listing queries.
* run-dir-perf-itest-v2.sh: corrected the v1 script, so we run a test without
authoritative directory listings in LocalMetadataStore
* all-logs-v2.txt: measurement results with the v2 diff and itest script.
In the results you can see a decreased time in directory listings when {{Using
metadata store DynamoDBMetadataStore\{region=us-west-2,
tableName=gaborbota-oregon\}, authoritative=true}} is used. The first query
takes longer, but then the cached entries can be reached from dynamo.
was (Author: gabor.bota):
I've uploaded the following:
* perf-eval-v2.diff: contains an additional change on top of v1 that will cause
an update on the metadata dir listing. This will not happen in
perf-eval-v1.diff so the measurements will not show the decreased time for
directory listing queries.
* run-dir-perf-itest-v2.sh: corrected the v1 script, so we run a test without
authoritative directory listings in LocalMetadataStore
* all-logs-v2.txt: measurement results with the v2 diff and itest script.
In the results you can see a decreased time in directory listings when {{Using
metadata store DynamoDBMetadataStore{region=us-west-2,
tableName=gaborbota-oregon}, authoritative=true}} is used. The first query
takes longer, but then the cached entries can be reached from dynamo.
> 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, HADOOP-14154.004.patch, all-logs-v2.txt,
> perf-eval-v1.diff, perf-eval-v2.diff, run-dir-perf-itest-v2.sh,
> 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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