对于大数据，spark WholeTextFiles失败

Question

I use pyspark version 1.5.0 with Cloudera 5.5.0. All scripts are running fine except when I use sc.wholeTextFiles . Using this command gives an error:

Kryo Serialization failed: Buffer overflow. Available:0, required: 23205706. To avoid this, increase spark.kryoserializer.buffer.max

However, I don't find the property spark.kryoserializer.buffer.max in the spark web UI; it is not present under the Environment tab in Spark web UI. The only "kryo" in this page is the value org.apache.spark.selializer.KryoSerializer of the name spark.serializer .

Why can't I see this property? And how to fix the problem?

EDIT

Turns out that the Kryo error was caused by a printing to the shell . Without printing, the error is actually java.io.IOExceptionL Filesystem closed ! The script now works correctly for a small portion of the data, but running it on all of the data (about 500GB , 10,000 files ) returns this error.

I tried to pass in the propery --conf "spak.yarn.executor.memoryOverhead=2000" , and it seems that it allows a slightly larger part of the data to be read, but it still ultimately fails on the full data. It takes 10-15 minutes of running before the error appears.

The RDD is big, but the error is produced even when only doing .count() on it.

Answer 1

You should pass such property when submitting a job. This is why it's not in Cloudera UI. http://www.cloudera.com/content/www/en-us/documentation/enterprise/latest/topics/cdh_ig_running_spark_apps.html

In your case: --conf "spark.kryoserializer.buffer.max = 64M" (for example)

Also, I'm not sure but it might happen that if you increase Kryo buffer you might want to increase akka frame size.