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https://issues.apache.org/jira/browse/AMBARI-18057?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Hurley updated AMBARI-18057:
-------------------------------------
Attachment: AMBARI-18057.patch
> NullPointerException When Retrieving Cluster via API Due To Database
> Inconsistency
> ----------------------------------------------------------------------------------
>
> Key: AMBARI-18057
> URL: https://issues.apache.org/jira/browse/AMBARI-18057
> Project: Ambari
> Issue Type: Bug
> Components: ambari-upgrade
> Affects Versions: 2.0.0
> Reporter: Jonathan Hurley
> Assignee: Jonathan Hurley
> Priority: Blocker
> Fix For: 2.4.0
>
> Attachments: AMBARI-18057.patch
>
>
> Noticed the following on an upgraded cluster:
> This is not related to EU it seems:
> {code}
> 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)
> {code}
> It looks like this is a problem with database consistency, namely that our
> upgrade logic does NOT properly enforce non-null and default values!
> {code:title="Not good..."}
> //TODO workaround for default values, possibly we will have full
> support later
> if (columnInfo.getDefaultValue() != null) {
> columnInfo.setNullable(true);
> }
> {code}
> 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.
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