Re: word count on parquet file

[shamu]

I changed the code to below...

JavaPairRDD rdd = sc.newAPIHadoopFile(inputFile,
ParquetInputFormat.class, NullWritable.class, String.class, mrConf);
JavaRDD words = rdd.values().flatMap(
new FlatMapFunction() {
public Iterable call(String x) {
return Arrays.asList(x.split(","));
}
});
With  this I get below error
 java.lang.NullPointerException
at
org.apache.parquet.hadoop.ParquetInputFormat.getReadSupportInstance(ParquetInputFormat.java:280)
at
org.apache.parquet.hadoop.ParquetInputFormat.getReadSupport(ParquetInputFormat.java:257)
at
org.apache.parquet.hadoop.ParquetInputFormat.createRecordReader(ParquetInputFormat.java:245)

My input file is a simple comma separated employee record, I created a hive
table with STORED AS PARQUET and then loaded the table from another hive
table... I can treat them as simple lines and I just need to do a word
count. So, Does my Key class and Value class make sense?

Thanks a lot for your support.
Best..



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Re: word count on parquet file

[ayan guha]

You are missing input. Mrconf is not the way to add input files. In spark,
try Dataframe read functions or sc.textfile function.

Best
Ayan
On 23 Aug 2016 07:12, "shamu"  wrote:

> Hi All,
> I am a newbie to Spark/Hadoop.
> I want to read a parquet file and a perform a simple word-count. Below is
> my
> code, however I get an error:
> Exception in thread "main" java.io.IOException: No input paths specified in
> job
> at
> org.apache.hadoop.mapreduce.lib.input.FileInputFormat.
> listStatus(FileInputFormat.java:239)
> at
> org.apache.parquet.hadoop.ParquetInputFormat.listStatus(
> ParquetInputFormat.java:349)
> at
> org.apache.hadoop.mapreduce.lib.input.FileInputFormat.
> getSplits(FileInputFormat.java:387)
> at
> org.apache.parquet.hadoop.ParquetInputFormat.getSplits(
> ParquetInputFormat.java:304)
> at org.apache.spark.rdd.NewHadoopRDD.getPartitions(
> NewHadoopRDD.scala:120)
>
> Below is my code. I guess I am missing some core concepts wrt hadoop
> InputFormats and making it working with spark. Coul d you please explain
> the
> cause and solution to get this working/
> -code
> snippet-
> JavaSparkContext sc = new JavaSparkContext(conf);
> org.apache.hadoop.conf.Configuration mrConf = new Configuration();
> mrConf.addResource(inputFile);
> JavaPairRDD textInputFormatObjectJavaPairRDD =
> sc.newAPIHadoopRDD(mrConf, ParquetInputFormat.class, String.class,
> String.class);
> JavaRDD words = textInputFormatObjectJavaPairRDD.values().flatMap(
> new FlatMapFunction() {
> public Iterable call(String x) {
> return Arrays.asList(x.split(","));
> }
> });
> long x = words.count();
>
> --thanks!
>
>
>
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