Renan Vicente Gomes da Silva created SPARK-18414:
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Summary: sc.textFile doesn't seem to use LzoTextInputFormat when
hadoop-lzo is installed
Key: SPARK-18414
URL: https://issues.apache.org/jira/browse/SPARK-18414
Project: Spark
Issue Type: Bug
Components: Input/Output
Affects Versions: 2.0.1
Reporter: Renan Vicente Gomes da Silva
Priority: Minor
When reading LZO files using sc.textFile it miss a few files from time to time.
Sample:
val Data = sc.textFile(Files)
listFiles += Data.count()
Considering that Files is a HDFS directory containing LZO files. If executed
for example a 1000 times it gets different results a few times.
Now if you use newAPIHadoopFile to force it to use
com.hadoop.mapreduce.LzoTextInputFormat it works perfectly, shows the same
results in all executions.
Sample:
val Data = sc.newAPIHadoopFile(Files,
classOf[com.hadoop.mapreduce.LzoTextInputFormat],
classOf[org.apache.hadoop.io.LongWritable],
classOf[org.apache.hadoop.io.Text]).map(_._2.toString)
listFiles += Data.count()
Looking at Spark code it looks like it use TextInputFormat by default but is
not using com.hadoop.mapreduce.LzoTextInputFormat when hadoop-lzo is installed.
https://github.com/apache/spark/blob/v2.0.1/core/src/main/scala/org/apache/spark/SparkContext.scala#L795-L801
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