[v26.1.x] kafka/server: cap fetch memory allocation at max message size limit#30313
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vbotbuildovich wants to merge 1 commit intoredpanda-data:v26.1.xfrom
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[v26.1.x] kafka/server: cap fetch memory allocation at max message size limit#30313vbotbuildovich wants to merge 1 commit intoredpanda-data:v26.1.xfrom
vbotbuildovich wants to merge 1 commit intoredpanda-data:v26.1.xfrom
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Use kafka_max_message_size_upper_limit_bytes to clamp max_bytes and max_batch_size in fetch memory allocation instead of the full shard fetch memory budget. This prevents a single partition with an inflated max.message.bytes (e.g. UINT32_MAX) from monopolizing the entire shard's fetch memory, which can starve other partitions and cause fetch timeouts. (cherry picked from commit 2b2c4b3)
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Backport of PR #30023