Vlad Rozov created APEXCORE-745:
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Summary: 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
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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