[jira] [Resolved] (SPARK-18414) sc.textFile doesn't seem to use LzoTextInputFormat when hadoop-lzo is installed

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-18414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-18414.
-------------------------------
    Resolution: Not A Problem

> 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
>              Labels: hadoop-lzo
>
> 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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