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似乎写入速度很慢 #94

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ysq5202121 opened this issue Aug 11, 2023 · 8 comments
Open

似乎写入速度很慢 #94

ysq5202121 opened this issue Aug 11, 2023 · 8 comments

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@ysq5202121
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不知道要怎么调整才能解决背压问题
@ysq5202121
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@itinycheng

@itinycheng
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Sink只是将数据写出给server，没什么多余的操作；
如果是Upsert操作看下是否是大量生成Alter语句导致的；

@ysq5202121
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@会有大量upsert

@itinycheng
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@会有大量upsert

可能和这个upsert有关，当前connector会将update的数据解析成 alter..update..，执行alter操作对clickhouse来说比较重；
这个是clickhouse慢，最好将update转成insert操作并配合表引擎来规避update操作，看下readme中的sink.update-strategy

@ysq5202121
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@itinycheng 会造成flink炸裂

@ysq5202121
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@itinycheng 如果改成insert就会出现大量重复数据，同步需要时间，会造成一段时间出现数据不正确的问题，如果采用版本似乎又不支持，需要写代码

@ysq5202121
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难道我了

@itinycheng
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配合表引擎比如：ReplacingMergeTree这种是可以操作的，我这边也没太多别的方法；

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@ysq5202121 @itinycheng