GitHub user ijokarumawak opened a pull request:
https://github.com/apache/nifi/pull/3116
NIFI-4715: ListS3 produces duplicates in frequently updated buckets
This PR is based on #2361. To preserve @adamlamar's credit, please do not
squash the first commit when merging. Thanks!
The 2nd commit avoids updating `currentKeys` during the listing loop.
Before this fix, it's easy to reproduce duplicated list with a small number of
objects. E.g 10 objects to S3 uploaded at the same time, ListS3 can produce 27
FlowFiles. Using min age doesn't address the issue.
Please use [the template file attached to the
JIRA](https://issues.apache.org/jira/secure/attachment/12946341/ListS3_Duplication.xml)
to reproduce.
After applying this fix, I confirmed ListS3 can produce FlowFiles without
duplication. I tested 10,000 objects were listed without duplication while
those were uploaded by PutS3 and listed by ListS3 simultaneously.
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Alternatively you can review and apply these changes as the patch at:
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This closes #3116
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commit 3853b13806121c1479edac2038634992ffc6fdfe
Author: Adam Lamar <adamonduty@...>
Date: 2017-12-24T03:29:02Z
NIFI-4715: ListS3 produces duplicates in frequently updated buckets
Keep totalListCount, reduce unnecessary persistState
This closes #2361.
Signed-off-by: Koji Kawamura <[email protected]>
commit 4d445055cf605811f85bfed12b33155adbd570a2
Author: Koji Kawamura <ijokarumawak@...>
Date: 2018-10-31T07:01:36Z
NIFI-4715: Update currentKeys after listing loop
ListS3 used to update currentKeys within listing loop, that causes
duplicates. Because S3 returns object list in lexicographic order, if we
clear currentKeys during the loop, we cannot tell if the object has been
listed or not, in a case where newer object has a lexicographically
former name.
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