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https://issues.apache.org/jira/browse/HADOOP-15625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16791986#comment-16791986
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Ben Roling commented on HADOOP-15625:
-------------------------------------
Is part of it bad fs.s3a.s3guard.ddb.table and/or fs.s3a.s3guard.ddb.region
config? The exception seems to suggest your Dynamo table doesn't exist:
{noformat}
java.io.FileNotFoundException: DynamoDB table
'testBucketInfoUnguarded-212fd4bb-f8bd-430b-8fea-739a53c131c8' does not exist
in region eu-west-1; auto-creation is turned off
{noformat}
> S3A input stream to use etags/version number to detect changed source files
> ---------------------------------------------------------------------------
>
> Key: HADOOP-15625
> URL: https://issues.apache.org/jira/browse/HADOOP-15625
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.2.0
> Reporter: Brahma Reddy Battula
> Assignee: Ben Roling
> Priority: Major
> Attachments: HADOOP--15625-006.patch, HADOOP-15625-001.patch,
> HADOOP-15625-002.patch, HADOOP-15625-003.patch, HADOOP-15625-004.patch,
> HADOOP-15625-005.patch, HADOOP-15625-006.patch, HADOOP-15625-007.patch,
> HADOOP-15625-008.patch, HADOOP-15625-009.patch, HADOOP-15625-010.patch,
> HADOOP-15625-011.patch, HADOOP-15625-012.patch, HADOOP-15625-013-delta.patch,
> HADOOP-15625-013.patch, HADOOP-15625-014.patch, HADOOP-15625-015.patch,
> HADOOP-15625-015.patch, HADOOP-15625-016.patch, HADOOP-15625-017.patch
>
>
> S3A input stream doesn't handle changing source files any better than the
> other cloud store connectors. Specifically: it doesn't noticed it has
> changed, caches the length from startup, and whenever a seek triggers a new
> GET, you may get one of: old data, new data, and even perhaps go from new
> data to old data due to eventual consistency.
> We can't do anything to stop this, but we could detect changes by
> # caching the etag of the first HEAD/GET (we don't get that HEAD on open with
> S3Guard, BTW)
> # on future GET requests, verify the etag of the response
> # raise an IOE if the remote file changed during the read.
> It's a more dramatic failure, but it stops changes silently corrupting things.
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