Copying files from a hdfs directory to another with oozie distcp-action

Question

My actions

start_fair_usage ends with status okey, but test_copy returns

Main class [org.apache.oozie.action.hadoop.DistcpM         


        

Answer 1

Here is what I did in the end.

  <start to="start_copy"/>

  <fork name="start_copy">
    <path start="copy_mta"/>
    <path start="copy_rcr"/>
    <path start="copy_sub"/>
  </fork>

  <action name="copy_mta">
    <distcp xmlns="uri:oozie:distcp-action:0.2">
      <prepare>
        <delete path="${NAME_NODE}${dstFolder}mta/*"/>
      </prepare>
      <arg>${NAME_NODE}${srcFolder}/*mta.gz</arg>
      <arg>${NAME_NODE}${dstFolder}mta/</arg>
    </distcp>
    <ok to="end_copy"/>
    <error to="KILL"/>
  </action>

  <action name="copy_rcr">
    <distcp xmlns="uri:oozie:distcp-action:0.2">
      <prepare>
        <delete path="${NAME_NODE}${dstFolder}rcr/*"/>
      </prepare>
      <arg>${NAME_NODE}${srcFolder}/*rcr.gz</arg>
      <arg>${NAME_NODE}${dstFolder}rcr/</arg>
    </distcp>
    <ok to="end_copy"/>
    <error to="KILL"/>
  </action>

  <action name="copy_sub">
    <distcp xmlns="uri:oozie:distcp-action:0.2">
      <prepare>
        <delete path="${NAME_NODE}${dstFolder}sub/*"/>
      </prepare>
      <arg>${NAME_NODE}${srcFolder}/*sub.gz</arg>
      <arg>${NAME_NODE}${dstFolder}sub/</arg>
    </distcp>
    <ok to="end_copy"/>
    <error to="KILL"/>
  </action>

  <join name="end_copy" to="END"/>

  <kill name="KILL">
    <message>Action failed, error message[${wf:errorMessage(wf:lastErrorNode())}]</message>
  </kill>
  <end name="END"/>

Turned out it was possible to use wildcards in distcp, so I didn't need bash at all.

Also. Some people adviced me to write it in scala.

import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.{FileSystem, Path, FileUtil}

val conf = new Configuration()
val fs = FileSystem.get(conf)

val listOfFileTypes = List("mta", "rcr", "sub")
val listOfPlatforms = List("B", "C", "H", "M", "Y")

for(fileType <- listOfFileTypes){
  FileUtil.fullyDeleteContents(new File("/apps/hive/warehouse/arstel.db/fair_usage/fct_evkuzmin/file_" + fileType))
  for (platform <- listOfPlatforms) {
    var srcPaths = fs.globStatus(new Path("/user/comverse/data/" + "20170404" + "_" + platform + "/*" + fileType + ".gz"))
    var dstPath = new Path("/apps/hive/warehouse/arstel.db/fair_usage/fct_evkuzmin/file_" + fileType)

    for(srcPath <- srcPaths){
      println("copying " + srcPath.getPath.toString)
      FileUtil.copy(fs, srcPath.getPath, fs, dstPath, false, conf)
    }
  }
}

Both things work, thought I haven't tried to run the scala script in Oozie.