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https://issues.apache.org/jira/browse/SOLR-8709?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein updated SOLR-8709:
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Description:
Currently the TopicStream can miss documents if version numbers are received
out-of-order. The TopicStream sorts on version number so it will only miss
out-of-order versions that span commit boundaries. *Stress testing was not able
create a missed document scenario*, but code review points to the possibility
of this happening.
In order to resolve this issue we can adopt an approach that keeps a checksum
for of the version numbers for a specific time window. This checksum can be
checked each run and if the checksums don't match the documents from the time
window can be resent. As long as the time window is longer then the softCommit
interval, this will guarantee delivery of all documents for the Topic. This
won't guarantee *one time delivery* but should be provide a reasonable
expectation of one time delivery.
was:
Currently the TopicStream can miss documents if version numbers are received
out-of-order. The TopicStream sorts on version number so it will only miss
out-of-order versions that span commit boundaries. Stress testing was not able
create a missed document scenario, but code review points to the possibility of
this happening.
In order to resolve this issue we can adopt an approach that keeps a checksum
for of the version numbers for a specific time window. This checksum can be
checked each run and if the checksums don't match the documents from the time
window can be resent. As long as the time window is longer then the softCommit
interval, this will guarantee delivery of all documents for the Topic. This
won't guarantee *one time delivery* but should be provide a reasonable
expectation of one time delivery.
> Add checksum to the TopicStream to ensure delivery of all documents within a
> Topic
> ----------------------------------------------------------------------------------
>
> Key: SOLR-8709
> URL: https://issues.apache.org/jira/browse/SOLR-8709
> Project: Solr
> Issue Type: Bug
> Reporter: Joel Bernstein
>
> Currently the TopicStream can miss documents if version numbers are received
> out-of-order. The TopicStream sorts on version number so it will only miss
> out-of-order versions that span commit boundaries. *Stress testing was not
> able create a missed document scenario*, but code review points to the
> possibility of this happening.
> In order to resolve this issue we can adopt an approach that keeps a checksum
> for of the version numbers for a specific time window. This checksum can be
> checked each run and if the checksums don't match the documents from the time
> window can be resent. As long as the time window is longer then the
> softCommit interval, this will guarantee delivery of all documents for the
> Topic. This won't guarantee *one time delivery* but should be provide a
> reasonable expectation of one time delivery.
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