# saveAsHadoopFiles(prefix, \[suffix])

### saveAsHadoopFiles(prefix, \[suffix])

Save this DStream's contents as Hadoop files. The file name at each batch interval is generated based on prefix and suffix: "prefix-TIME\_IN\_MS\[.suffix]".

Python API This is not available in the Python API.

Example:

```
import org.apache.spark._
import org.apache.spark.SparkContext._
import org.apache.spark.streaming._
import org.apache.spark.streaming.StreamingContext._
import org.apache.log4j.{Level, Logger}
import org.apache.spark.sql.{Row, SaveMode, SparkSession}
import org.apache.spark.sql.SQLContext

import org.apache.hadoop.mapred.TextOutputFormat
import org.apache.hadoop.io.Text
import org.apache.hadoop.io.IntWritable

Logger.getLogger("org").setLevel(Level.ERROR)  
val spark = SparkSession
          .builder()
          .config("spark.master", "local[2]")
          .appName("streaming for book")
          .getOrCreate()

spark.sparkContext.setCheckpointDir("/tmp/")

import spark.implicits._
val sc=spark.sparkContext
val ssc = new StreamingContext(sc, Seconds(1))


val messages1 = ssc.textFileStream("/tmp/filestream1/").filter(_.nonEmpty).map(x=>(x,x))

messages1.print()
messages1.saveAsHadoopFiles
  ("hdfs://10.0.0.202:9000/tmp/","txt")
ssc.start()
ssc.awaitTermination()

/*

on 10.0.0.202, run below

hdfs dfs -ls /tmp

output:

...
drwxr-xr-x   - dv6 supergroup          0 2020-03-08 00:28 /tmp/-1583656122000.txt
drwxr-xr-x   - dv6 supergroup          0 2020-03-08 00:28 /tmp/-1583656123000.txt
drwxr-xr-x   - dv6 supergroup          0 2020-03-08 00:28 /tmp/-1583656124000.txt
drwxr-xr-x   - dv6 supergroup          0 2020-03-08 00:28 /tmp/-1583656125000.txt
...

*/

```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://george-jen.gitbook.io/data-science-and-apache-spark/saveashadoopfiles-prefix-suffix.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.