> For the complete documentation index, see [llms.txt](https://george-jen.gitbook.io/data-science-and-apache-spark/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://george-jen.gitbook.io/data-science-and-apache-spark/saveasobjectfiles-prefix-suffix.md).

# saveAsObjectFiles(prefix, \[suffix])

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

Save this DStream's contents as SequenceFiles of serialized Java objects. 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

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/")
val messages2 = ssc.textFileStream("/tmp/filestream2/")
val messages11=messages1.filter(_.nonEmpty).map(x=>(x,x))
val messages22=messages2.filter(_.nonEmpty).map(x=>(x,x))
val messages4=messages11.join(messages22)

messages4.print()
messages4.saveAsObjectFiles("/tmp/stream-TIME_IN_MS.obj")

ssc.start()
ssc.awaitTermination()

/*

in /tmp/

drwxrwxr-x   2 dv6  dv6   4096 Mar  7 23:05 stream-TIME_IN_MS.obj-1583651108000
drwxrwxr-x   2 dv6  dv6   4096 Mar  7 23:05 stream-TIME_IN_MS.obj-1583651109000
drwxrwxr-x   2 dv6  dv6   4096 Mar  7 23:05 stream-TIME_IN_MS.obj-1583651110000
drwxrwxr-x   2 dv6  dv6   4096 Mar  7 23:05 stream-TIME_IN_MS.obj-1583651111000
drwxrwxr-x   2 dv6  dv6   4096 Mar  7 23:05 stream-TIME_IN_MS.obj-1583651112000
drwxrwxr-x   2 dv6  dv6   4096 Mar  7 23:05 stream-TIME_IN_MS.obj-1583651113000
...

*/

```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

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

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.