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update design doc

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Xiaoxi Wang 2022-08-10 09:53:10 -07:00
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design/data-distributor-internals.md
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@ -165,7 +165,7 @@ CPU utilization. This metric is in a positive relationship with “FinishedQueri
```
) for different relocation reason (`Other`, `RebalanceDisk` and so on) in different phase within `DD_QUEUE_COUNTER_REFRESH_INTERVAL` (default 60) seconds. For example,
```xml
<Event Severity="10" Time="1659974950.984176" DateTime="2022-08-08T16:09:10Z" Type="DDQueueServerCounter" ID="0000000000000000" ServerId="0000000000000004" Other="0 1 3 2" RebalanceDisk="0 0 1 4" RebalanceRead="2 0 0 5" ThreadID="9733255463206053180" Machine="0.0.0.0:0" LogGroup="default" Roles="TS" />
<Event Severity="10" Time="1659974950.984176" DateTime="2022-08-08T16:09:10Z" Type="DDQueueServerCounter" ID="0000000000000000" ServerId="0000000000000004" Other="0 1 3 2" RebalanceDisk="0 0 1 4" RebalanceRead="2 0 0 5" MergeShardPQSD="0 0 1 0" SizeSplitPQSD="0 0 0 0" WriteSplitPQSD="0 0 0 0" ThreadID="9733255463206053180" Machine="0.0.0.0:0" LogGroup="default" Roles="TS" />
```
`RebalanceRead="2 0 0 5"` means server `0000000000000004` has been selected as for read balancing for twice, but it's not queued and executed yet. This server also has been a destination for read balancing for 5 times in the past 1 min. To avoid spammy traces, if is enabled with knob `DD_QUEUE_COUNTER_SUMMARIZE = true`, event `DDQueueServerCounterTooMany` will summarize the unreported servers that involved in launched relocations:
```xml