How to check whether the file exist in HDFS location, using oozie?

问题

How to check whether a file in HDFS location is exist or not, using Oozie?

In my HDFS location I will get a file like this test_08_01_2016.csv at 11PM , on a daily basis.

I want check whether this file exist after 11.15 PM. I can schedule the batch using a Oozie coordinator job.

But how can I validate if the file exists in HDFS?

回答1:

you can use EL expression in oozie like:

<decision name="CheckFile">
         <switch>
            <case to="nextOozieTask">
              ${fs:exists('/path/test_08_01_2016.csv')} <!--do note the path which should be in ''-->
            </case>
            <default to="MailActionFileMissing" />
         </switch>
</decision>

You can also build the name of the file using simple shell script using capture output.

来源：https://stackoverflow.com/questions/39033693/how-to-check-whether-the-file-exist-in-hdfs-location-using-oozie