BigQuery writeTableRows 始终写入缓冲区 [英] BigQuery writeTableRows Always writing to buffer
问题描述
我们正在尝试使用 Apache Beam 和 avro 写入 Big Query.
We are trying to write to Big Query using Apache Beam and avro.
以下似乎工作正常:-
p.apply("Input", AvroIO.read(DataStructure.class).from("AvroSampleFile.avro"))
.apply("Transform", ParDo.of(new CustomTransformFunction()))
.apply("Load", BigQueryIO.writeTableRows().to(table).withSchema(schema));
然后我们尝试通过以下方式使用它从 Google Pub/Sub 获取数据
We then tried to use it in the following manner to get data from the Google Pub/Sub
p.begin()
.apply("Input", PubsubIO.readAvros(DataStructure.class).fromTopic("topicName"))
.apply("Transform", ParDo.of(new CustomTransformFunction()))
.apply("Write", BigQueryIO.writeTableRows()
.to(table)
.withSchema(schema)
.withTimePartitioning(timePartitioning)
.withCreateDisposition(BigQueryIO.Write.CreateDisposition.CREATE_IF_NEEDED)
.withWriteDisposition(BigQueryIO.Write.WriteDisposition.WRITE_APPEND));
p.run().waitUntilFinish();
当我们这样做时,它总是将其推送到缓冲区,而 Big Query 似乎需要很长时间才能从缓冲区读取.谁能告诉我为什么上面不会将记录直接写入 Big Query 表?
When we do this it always pushes it to the buffer and Big Query seems to take a long time to read from the buffer. Can anyone tell me why the above won't write the records directly to the Big Query tables?
更新:-看起来我需要添加以下设置,但这会引发 java.lang.IllegalArgumentException.
UPDATE:- It looks like I need add the following settings but this throws an java.lang.IllegalArgumentException.
.withMethod(Method.FILE_LOADS)
.withTriggeringFrequency(org.joda.time.Duration.standardMinutes(2))
推荐答案
答案是你需要像这样包含withNumFileShards"(可以是 1 到 1000).
The answer is you need to include "withNumFileShards" like so (Can be 1 to 1000).
p.begin()
.apply("Input", PubsubIO.readAvros(DataStructure.class).fromTopic("topicName"))
.apply("Transform", ParDo.of(new CustomTransformFunction()))
.apply("Write", BigQueryIO.writeTableRows()
.to(table)
.withSchema(schema)
.withTimePartitioning(timePartitioning)
.withMethod(Method.FILE_LOADS)
.withTriggeringFrequency(org.joda.time.Duration.standardMinutes(2))
.withNumFileShards(1000)
.withCreateDisposition(BigQueryIO.Write.CreateDisposition.CREATE_IF_NEEDED)
.withWriteDisposition(BigQueryIO.Write.WriteDisposition.WRITE_APPEND));
p.run().waitUntilFinish();
我无法在任何地方找到这个文档来说明 withNumFileShards 是强制性的,但是我在修复后找到了一个 Jira 票证.
I can't find this documented anywhere to say that withNumFileShards is mandatory however there is a Jira ticket for this which I found after the fix.
https://issues.apache.org/jira/browse/BEAM-3198
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