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bba975a991
The task-queue API only allows reading 1000 tasks at a time, hence the original reason for this limit. We get over that limit by reading (and processing) items from the queue in a loop - 1000 at a time. This is important because the 1000 dns-updates are shared among all TLDs, meaning that a TLD with >1000 waiting updates can affect the update latency of other TLDs. In addition, partially fixes the bug where if there are more than 1000 updates to paused / non-existing TLDs, we completely block all updated to all TLDs. By partially fixed, I mean "if we have around 1000 updates to paused TLDs, we will read them every time ReadDnsUpdates is called, ignore then, and only then get to the actual updates we want to process". This works for a number of 1000 updates waiting - but if paused TLDs have tens or hundreds of thousands of updates waiting - this might still choke up other TLDs (not to mention we keep reading / updating 10s or 100s of thousands of tasks in the queue, that's... bad.) A more thorough fix will come in a future CL, as it requires a more thorough change in the code. Note that the queue lease command supports a maximum of 10 QPS. Any more than that - and we get errors / empty results. Hence we limit our QPS to 9 to be on the safe side. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=185218684 |
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