[Filebeat] lumberjack - refactor loop logic into method #33071
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Move the batch processing logic contained with the lumberjack server into its own method. The closure passed to newBatchACKTracker referenced the loop variable whose value would change on each iteration. This resulted in incorrect ACKing behavior.
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efd6
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Can you paste an example panic here? |
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Move the batch processing logic contained with the lumberjack server into its own method. The closure passed to newBatchACKTracker referenced the loop variable whose value would change on each iteration. This resulted in incorrect ACKing behavior.
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What does this PR do?
Move the batch processing logic contained with the lumberjack server into its own method.
The closure passed to
newBatchACKTrackerreferenced the loop variable (line 84) whose value would change on each iteration. This resulted in incorrect ACKing behavior. This is a fix for a new unreleased input targeting v8.5.0 hence no changelog or backport.beats/x-pack/filebeat/input/lumberjack/server.go
Lines 70 to 84 in c293fbd
Why is it important?
Any concurrent batch processing can result in incorrect behavior or panics.
Checklist
CHANGELOG.next.asciidocorCHANGELOG-developer.next.asciidoc.How to test this PR locally
Unit testing didn't expose this since it requires multiple concurrent batches. My test strategy was to run three filebeats. One receiving data on 5044. And two others sending batches and exiting.
while [ true ]; do gtimeout 5 ./filebeat -e -c ./filebeat.logstash.yml --path.data=data1; rm -rf data; donewhile [ true ]; do gtimeout 5 ./filebeat -e -c ./filebeat.logstash.yml --path.data=data2; rm -rf data; doneRelated issues