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https://issues.apache.org/jira/browse/CASSANDRA-14385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-14385:
-----------------------------------------
Component/s: Materialized Views
> Fix Some Potential NPE
> -----------------------
>
> Key: CASSANDRA-14385
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14385
> Project: Cassandra
> Issue Type: Bug
> Components: Materialized Views
> Reporter: lujie
> Priority: Major
> Attachments: CA-14385_1.patch
>
>
> We have developed a static analysis tool
> [NPEDetector|https://github.com/lujiefsi/NPEDetector] to find some potential
> NPE. Our analysis shows that some callees may return null in corner case(e.g.
> node crash , IO exception), some of their callers have _!=null_ check but
> some do not have. In this issue we post a patch which can add !=null based
> on existed !=null check. For example:
> Calle Schema#getView may return null:
> {code:java}
> public ViewMetadata getView(String keyspaceName, String viewName)
> {
> assert keyspaceName != null;
> KeyspaceMetadata ksm = keyspaces.getNullable(keyspaceName);
> return (ksm == null) ? null : ksm.views.getNullable(viewName);//may
> return null
> }
> {code}
> it have 4 callers, 3 of them have !=null check, like its caller
> MigrationManager#announceViewDrop have !=null check()
> {code:java}
> public static void announceViewDrop(String ksName, String viewName, boolean
> announceLocally) throws ConfigurationException
> {
> ViewMetadata view = Schema.instance.getView(ksName, viewName);
> if (view == null)//null pointer checker
> throw new ConfigurationException(String.format("Cannot drop non
> existing materialized view '%s' in keyspace '%s'.", viewName, ksName));
> KeyspaceMetadata ksm = Schema.instance.getKeyspaceMetadata(ksName);
> logger.info("Drop table '{}/{}'", view.keyspace, view.name);
> announce(SchemaKeyspace.makeDropViewMutation(ksm, view,
> FBUtilities.timestampMicros()), announceLocally);
> }
> {code}
> but caller MigrationManager#announceMigration does not have
> We add !=null check based on MigrationManager#announceViewDrop:
> {code:java}
> if (current == null)
> throw new InvalidRequestException("There is no materialized view in
> keyspace " + keyspace());
> {code}
> But due to we are not very familiar with CASSANDRA, hope some expert can
> review it.
> Thanks!!!!
>
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