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From "Nathan Bamford (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-17223) HCatReader throws exception attempting to read a view
Date Tue, 01 Aug 2017 16:23:00 GMT
Nathan Bamford created HIVE-17223:
-------------------------------------

             Summary: HCatReader throws exception attempting to read a view
                 Key: HIVE-17223
                 URL: https://issues.apache.org/jira/browse/HIVE-17223
             Project: Hive
          Issue Type: Bug
          Components: HCatalog
    Affects Versions: 1.2.1
            Reporter: Nathan Bamford


When HCatReader.prepareRead is called with a ReadEntity built with a view, a null exception
is thrown:

HCatOutputFormat not initialized, setOutput has to be called. Cause : java.io.IOException:
java.lang.NullPointerException
    org.apache.hive.hcatalog.data.transfer.impl.HCatInputFormatReader.prepareRead(HCatInputFormatReader.java:73)
    net.redpoint.hiveclient.DMHCatSplitReader.getSplitInfo(DMHCatSplitReader.java:127)
Caused by: java.io.IOException: java.lang.NullPointerException
    org.apache.hive.hcatalog.mapreduce.HCatInputFormat.setInput(HCatInputFormat.java:97)
    org.apache.hive.hcatalog.mapreduce.HCatInputFormat.setInput(HCatInputFormat.java:61)
    org.apache.hive.hcatalog.data.transfer.impl.HCatInputFormatReader.prepareRead(HCatInputFormatReader.java:65)
    net.redpoint.hiveclient.DMHCatSplitReader.getSplitInfo(DMHCatSplitReader.java:127)
Caused by: java.lang.NullPointerException
    java.lang.Class.forName0(Native Method)
    java.lang.Class.forName(Class.java:274)
    org.apache.hadoop.hive.common.JavaUtils.loadClass(JavaUtils.java:78)
    org.apache.hadoop.hive.common.JavaUtils.loadClass(JavaUtils.java:74)
    org.apache.hive.hcatalog.mapreduce.FosterStorageHandler.<init>(FosterStorageHandler.java:68)
    org.apache.hive.hcatalog.common.HCatUtil.getStorageHandler(HCatUtil.java:404)
    org.apache.hive.hcatalog.common.HCatUtil.getStorageHandler(HCatUtil.java:367)
    org.apache.hive.hcatalog.mapreduce.InitializeInput.extractPartInfo(InitializeInput.java:158)
    org.apache.hive.hcatalog.mapreduce.InitializeInput.getInputJobInfo(InitializeInput.java:137)
    org.apache.hive.hcatalog.mapreduce.InitializeInput.setInput(InitializeInput.java:86)
    org.apache.hive.hcatalog.mapreduce.HCatInputFormat.setInput(HCatInputFormat.java:95)
    org.apache.hive.hcatalog.mapreduce.HCatInputFormat.setInput(HCatInputFormat.java:61)
    org.apache.hive.hcatalog.data.transfer.impl.HCatInputFormatReader.prepareRead(HCatInputFormatReader.java:65)

  Digging into the code a little bit, I discovered that the StorageDescriptor associated with
the view has its serializationLib set to null, and this eventually causes the null error when
calling HCatUtil.getStorageHandler.



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