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https://issues.apache.org/jira/browse/ATLAS-3021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lin Han updated ATLAS-3021:
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Issue Type: Bug (was: Improvement)
> A question of the index key of eneity's attribute
> --------------------------------------------------
>
> Key: ATLAS-3021
> URL: https://issues.apache.org/jira/browse/ATLAS-3021
> Project: Atlas
> Issue Type: Bug
> Components: atlas-core, atlas-intg
> Affects Versions: 1.1.0
> Environment: centos
> Reporter: Lin Han
> Priority: Major
>
> hi, guys
> At these days, When i want to improve the efficiency of atlas create new
> entity by use the function "createOrUpdate" of AtlasEntityStoreV2, so i find
> the way to use the index.
> 1.add the config
> "atlas.use.index.query.to.find.entity.by.unique.attributes=true" to my
> atlas-application.properties,
> 2.add the config "<isIndexable>true</isIndexable>" to the attribute of my
> ClassType define xml, like this :
> {code:java}
> //代码占位符
> <ClassType>
> <name>HDFSDir</name>
> <desc>HDFS directory</desc>
> <attrs>
> <attr>
> <name>contextPath</name>
> <desc>HDFS directory contextPath</desc>
> <isOptional>false</isOptional>
> <isIndexable>true</isIndexable>
> <typeName>string</typeName>
> <isUnique>true</isUnique>
> <cardinality>single</cardinality>
> <extInfo>
> <item key="canconfig" value="false"/>
> </extInfo>
> </attr>
> ...
> {code}
> The question is that i find the "canUseIndexQuery" function code of
> AtlasGraphUtilsV2.java always return false
> {code:java}
> //代码占位符
> private static boolean canUseIndexQuery(AtlasEntityType entityType, String
> attributeName) {
> boolean ret = false;
> if (USE_INDEX_QUERY_TO_FIND_ENTITY_BY_UNIQUE_ATTRIBUTES) {
> final String typeAndSubTypesQryStr =
> entityType.getTypeAndAllSubTypesQryStr();
> ret = typeAndSubTypesQryStr.length() <=
> SearchProcessor.MAX_QUERY_STR_LENGTH_TYPES;
> if (ret) {
> Set<String> indexSet =
> AtlasGraphProvider.getGraphInstance().getVertexIndexKeys();
> try {
> ret =
> indexSet.contains(entityType.getQualifiedAttributeName(attributeName));
> }
> catch (AtlasBaseException ex) {
> ret = false;
> }
> }
> }
> return ret;
> }{code}
> The indexSet contains the "HDFSDir.contextPath__superTypeNames" and
> "HDFSDir.contextPath__typeName"(this is the index Generate by atlas due to
> the isIndexable config),but the code
> "entityType.getQualifiedAttributeName(attributeName)" return is
> "HDFSDir.contextPath", so it's obvious that indexSet is not contains the
> "HDFSDir.contextPath".
> And I also find that the function "createIndexForAttribute" of
> GraphBackedSearchIndexer.java, the config "isIndexable=true" is to create the
> CompositeIndexWithTypeAndSuperTypes, and it will not create the
> CompositeIndex because the parameter createCompositeIndex is false,
> hard-coded.
> So how to really use the index when create entity or I used it in a wrong way?
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