The jar file compiled by Flink and Spark Connector, with the corresponding Flink, Spark version
and Scala version at compile time, so that users can know whether the version number matches when using it.
Example of output file name：doris-spark-1.0.0-spark-3.2.0_2.12.jar
Doris should provide a http api to return backends list for connectors to submit stream load,
and without privilege checking, which can let common user to use it
1. By default , Spark connector must write all fields value to `Doris` table .
In this feature , user can specify part of fields to write , even specify the order of the fields to write.
eg:
I have a table named `student` which has three columns (name,gender,age) ,
creating table sql as following:
```sql
create table student (name varchar(255), gender varchar(10), age int) duplicate key (name) distributed by hash(name) buckets 2;
```
Now , I just want to write values to two columns : name , gender.
The code as following:
```scala
val df = spark.createDataFrame(Seq(
("m", "zhangsan"),
("f", "lisi"),
("m", "wangwu")
))
df.write
.format("doris")
.option("doris.fenodes", dorisFeNodes)
.option("doris.table.identifier", dorisTable)
.option("user", dorisUser)
.option("password", dorisPwd)
//specify your fields or the order
.option("doris.write.field", "gender,name")
.save()
```
1. Simplify the use of flink connector like other stream sink by GenericDorisSinkFunction.
2. Add the use cases of flink connector.
## Use case
```
env.fromElements("{\"longitude\": \"116.405419\", \"city\": \"北京\", \"latitude\": \"39.916927\"}")
.addSink(
DorisSink.sink(
DorisOptions.builder()
.setFenodes("FE_IP:8030")
.setTableIdentifier("db.table")
.setUsername("root")
.setPassword("").build()
));
```
* [Bug]:fix when data null , throw NullPointerException
* [Bug]:Distinguish between null and empty string
* [Feature]:flink-connector supports streamload parameters
* [Fix]:code style
* [Fix]: support json format import and use httpclient to streamload
* [Fix]:remove System out
* [Fix]:upgrade httpclient version
* [Doc]: add json format import doc
Co-authored-by: wudi <wud3@shuhaisc.com>
make doriswriter of DataX support format csv. Format csv is more simple and faster than
format json when data is simple
add property format: csv/json
add property column_separator: effect when format is csv, for example "\x01" , "^", etc...
Modify spark, flink doris connector to send request to FE, fix the problem of POST method,
it should be the same as the method when sending the request
This plugin is used to output data to Doris for logstash
Use the HTTP protocol to interact with the Doris FE Http interface
Load data through Doris's stream load
Mainly changes:
1. Shade and provide the thrift lib in spark-doris-connector
2. Add a `build.sh` for spark-doris-connector
3. Move the README.md of spark-doris-connector to `docs/`
4. Change the line delimiter of `fe/src/test/java/org/apache/doris/analysis/AggregateTest.java`
Currently, in the Spark-Doris-Connector, when Spark iteratively obtains each row of data,
it needs to synchronously convert the Arrow format data into the row format required by Spark.
In order to speed up the conversion process, we can add an asynchronous thread in the Connector,
which is responsible for obtaining the Arrow format data from BE and converting it into the row
format required by Spark calculation
In our test environment, Doris cluster used 1 fe and 7 be (32C+128G). When using Spark-Doris-Connector
to query a table containing 67 columns, the original query returned 69 million rows of data
took about 2.5min, but after improvement, it reduced to about 1.6min, which reduced the time by about 30%
For #2722
In our test environment, Doris cluster used 1 fe and 7 be (32C+128G). When using spakr-doris connecter to query a table containing 67 columns, it took about 1 hour for the query to return 69 million rows of data. After the improvement, the same query condition took 2.5 minutes and the query performance was significantly improved
