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  1. Ambari
  2. AMBARI-18057

NullPointerException When Retrieving Cluster via API Due To Database Inconsistency

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: 2.0.0
    • Fix Version/s: 2.4.0
    • Component/s: ambari-upgrade
    • Labels:
      None

      Description

      Noticed the following on an upgraded cluster:
      This is not related to EU it seems:

      java.lang.NullPointerException
              at org.apache.ambari.server.controller.internal.AlertResourceProvider.toResource(AlertResourceProvider.java:277)
              at org.apache.ambari.server.controller.internal.AlertResourceProvider.getResources(AlertResourceProvider.java:234)
              at org.apache.ambari.server.controller.internal.AlertResourceProvider.queryForResources(AlertResourceProvider.java:160)
              at org.apache.ambari.server.controller.internal.ClusterControllerImpl$ExtendedResourceProviderWrapper.queryForResources(ClusterControllerImpl.java:966)
              at org.apache.ambari.server.controller.internal.ClusterControllerImpl.getResources(ClusterControllerImpl.java:141)
              at org.apache.ambari.server.api.query.QueryImpl.doQuery(QueryImpl.java:529)
              at org.apache.ambari.server.api.query.QueryImpl.queryForResources(QueryImpl.java:398)
              at org.apache.ambari.server.api.query.QueryImpl.execute(QueryImpl.java:222)
      

      It looks like this is a problem with database consistency, namely that our upgrade logic does NOT properly enforce non-null and default values!

      "Not good..."
            //TODO workaround for default values, possibly we will have full support later
            if (columnInfo.getDefaultValue() != null) {
              columnInfo.setNullable(true);
            }
      

      Turns out we're doing at least 2 things very wrong here when changing the DB on Ambari upgrade:

      • Not enforcing non-NULL constraint on columns
      • Not enforcing a default constraint on column

      This is most likely due to limitations in EclipseLink's TableDefinition and FieldDefinition classes which we rely on for our upgrade logic.

        Attachments

        1. AMBARI-18057.patch
          17 kB
          Jonathan Hurley

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              • Assignee:
                jonathanhurley Jonathan Hurley
                Reporter:
                jonathanhurley Jonathan Hurley
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                • Created:
                  Updated:
                  Resolved: