我正在使用Spark 2.0.
我有一个DataFrame.我的代码如下所示:
df.write.partitionBy("year", "month", "day").format("csv").option("header", "true").save(s"s3://bucket/")
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当程序执行时,它以下列格式写入文件:
s3://bucket/year=2016/month=11/day=15/file.csv
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如何配置格式如下:
s3://bucket/2016/11/15/file.csv
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我还想知道是否可以配置文件名.
这里的相关文档看起来很稀疏......
http://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.sql.DataFrameWriter
partitionBy(colNames: String*): DataFrameWriter[T]
Partitions the output by the given columns on the file system. If specified, the output is laid out on the file system similar to Hive's partitioning scheme. As an example, when we partition a dataset by year and then month, the directory layout would look like:
year=2016/month=01/
year=2016/month=02/
Partitioning is one of the most widely used techniques to optimize physical data layout. It …
Run Code Online (Sandbox Code Playgroud) 我是否只能在 Excel VBA 立即窗口中执行 1 个命令?有没有办法执行多个语句?
我可以packages.lock.json
按照此链接中的说明启用生成文件:
https://learn.microsoft.com/en-us/nuget/consume-packages/package-references-in-project-files#locking-dependency
示例packages.lock.json
文件可能如下所示:
{
"version": 1,
"dependencies": {
".NETCoreApp,Version=v3.1": {
"Microsoft.NETFramework.ReferenceAssemblies": {
"type": "Direct",
"requested": "[1.0.0, )",
"resolved": "1.0.0",
"contentHash": "7D2TMufjGiowmt0E941kVoTIS+GTNzaPopuzM1/1LSaJAdJdBrVP0SkZW7AgDd0a2U1DjsIeaKG1wxGVBNLDMw=="
},
"Newtonsoft.Json": {
"type": "Direct",
"requested": "[12.0.3, )",
"resolved": "12.0.3",
"contentHash": "6mgjfnRB4jKMlzHSl+VD+oUc1IebOZabkbyWj2RiTgWwYPPuaK1H97G1sHqGwPlS5npiF5Q0OrxN1wni2n5QWg=="
}
}
}
}
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是否有有关该文件的架构及其含义的文档?我注意到节点下有type
、resolved
、contentHash
等字段dependencies
。
有时节点可能遵循以下模式:
"Microsoft.Win32.Primitives": {
"type": "Transitive",
"resolved": "4.3.0",
"contentHash": "9ZQKCWxH7Ijp9BfahvL2Zyf1cJIk8XYLF6Yjzr2yi0b2cOut/HQ31qf1ThHAgCc3WiZMdnWcfJCgN82/0UunxA==",
"dependencies": {
"Microsoft.NETCore.Platforms": "1.1.0",
"Microsoft.NETCore.Targets": "1.1.0",
"System.Runtime": "4.3.0"
}
}
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或者
"somenameclient": {
"type": "Project",
"dependencies": {
"SomeNameClientLib": "1.0.0",
"RRRBase": "1.0.0" …
Run Code Online (Sandbox Code Playgroud) 我从s3文件输入以下DataFrame,需要将数据转换为以下所需的输出.我使用Spark版本1.5.1和Scala,但可以用Python改为Spark.欢迎任何建议.
DataFrame输入:
name animal data
john mouse aaaaa
bob mouse bbbbb
bob mouse ccccc
bob dog ddddd
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期望的输出:
john/mouse/file.csv
bob/mouse/file.csv
bob/dog/file.csv
terminal$ cat bob/mouse/file.csv
bbbbb
ccccc
terminal$ cat bob/dog/file.csv
ddddd
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这是我尝试过的现有Spark Scala代码:
val sc = new SparkContext(new SparkConf())
val sqlc = new org.apache.spark.sql.SQLContext(sc)
val df = sqlc.read.json("raw.gz")
val cols = Seq("name", "animal")
df.groupBy(cols.head, cols.tail: _*).count().take(100).foreach(println)
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电流输出:
[john,mouse,1]
[bob,mouse,2]
[bob,dog,1]
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我现有代码的一些问题是groupBy返回一个GroupedData对象,我可能不想对该数据执行count/sum/agg函数.我正在寻找一种更好的技术来分组和输出数据.数据集非常大.
您好stackoverflow社区,
我在droid 4.0.3设备上使用Android API 14.
在Activity中,我设置了一个Button,用于在页面执行操作时显示TextView.执行操作后,我希望TextView再次消失.
button1.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// make textview visible
textView1.setVisibility(View.VISIBLE);
// perform action
System.out.println("perform action");
// make textview disappear
textView1.setVisibility(View.GONE);
}
});
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如果我删除使TextView消失的部分,TextView会按预期显示在窗口的顶部,但我希望TextView出现1-2秒然后消失.
起初我想知道我是否需要做更多的工作,而不仅仅是执行一个小动作,所以我尝试添加一个等待和打印文本,但没有一个工作.等待总是调用异常,结束活动,当我打印出数字1-1000时,视图仍然永久消失.
是否有更好的方法使TextView在OnClick操作中显示和消失?
谢谢你的帮助!
批处理文件Test.cmd
:
@set args=args1
@set value=value1
@if defined value (
@echo args: [%args%], value: [%value%]
@set args=%args% /value=%value%
@echo args: [%args%]
)
@echo args: [%args%]
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命令输出>.\Test.cmd
:
args: [args1], value: [value1]
args: [args1]
args: [args1 /value=value1]
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为什么我的每次调用都会@echo args: [%args%]
返回不同的值?(一种没有更新的参数值,args1
,一种具有更新,args1 /value=value1
)