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https://issues.apache.org/jira/browse/APEXCORE-745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16070856#comment-16070856
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ASF GitHub Bot commented on APEXCORE-745:
-----------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/apex-core/pull/542
> Buffer server may stop processing tuples when backpressure is enabled
> ---------------------------------------------------------------------
>
> Key: APEXCORE-745
> URL: https://issues.apache.org/jira/browse/APEXCORE-745
> Project: Apache Apex Core
> Issue Type: Bug
> Components: Buffer Server
> Affects Versions: 3.6.0
> Reporter: Vlad Rozov
> Assignee: Vlad Rozov
> Priority: Critical
> Fix For: 3.7.0
>
>
> When backpressure is enabled, blocks released by a publisher are not evicted.
> This may lead to a condition (for example when there is a delay between
> publisher and subscribers request) where the publisher publishes all data
> blocks that the buffer server is allowed to allocate before subscribers
> submit subscription requests. It leads to the publisher being blocked, so it
> does not accept any new data and does not notify subscribers that the new
> data is available. At the same time subscribers are not scheduled to run
> after they catchup (or exit catchup), so the publisher will be blocked
> indefinitely. Restarting the downstream container (due to, for example,
> blocked downstream operator) repeat the same sequence and does not help.
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