Amazon dynamodb 无法创建复合索引，卡在已安装的位置
我无法创建索引。我的小精灵代码如下：Amazon dynamodb 无法创建复合索引，卡在已安装的位置,amazon-dynamodb,titan,gremlin,Amazon Dynamodb,Titan,Gremlin,我无法创建索引。我的小精灵代码如下： usernameProperty = mgmt.getPropertyKey('username') usernameIndex = mgmt.buildIndex('byUsernameUnique', Vertex.class).addKey(usernameProperty).unique().buildCompositeIndex() mgmt.setConsistency(usernameIndex, ConsistencyModifier.LOC
usernameProperty = mgmt.getPropertyKey('username')
usernameIndex = mgmt.buildIndex('byUsernameUnique', Vertex.class).addKey(usernameProperty).unique().buildCompositeIndex()
mgmt.setConsistency(usernameIndex, ConsistencyModifier.LOCK)
mgmt.commit()
位置usernameIndex.getIndexStatus(usernameProperty)
==>INSTALLED
mgmt.getOpenInstances()
==>0a00009d3011-ip-10-0-0-1572(current)
REGISTER\u INDEXmgmt.updateIndex(usernameIndex, SchemaAction.REGISTER_INDEX).get()
mgmt.commit()
waitgraphstatusmgmt = graph.openManagement();
usernameIndex = mgmt.getPropertyKey('usernameIndex');
mgmt.buildIndex('byUsername',Vertex.class).addKey(usernameIndex).unique().buildCompositeIndex();
// I have tried with and without a commit here: mgmt.commit();
mgmt.awaitGraphIndexStatus(graph, 'byUsername').status(SchemaStatus.REGISTERED).timeout(10, java.time.temporal.ChronoUnit.MINUTES).call();
mgmt = graph.openManagement()
theIndex = mgmt.getGraphIndex('byUsername')
mgmt.updateIndex(theIndex, SchemaAction.DISABLE_INDEX).get()
mgmt.commit()
mgmt.awaitGraphIndexStatus(graph, 'byUsername').status(SchemaStatus.DISABLED).timeout(10, java.time.temporal.ChronoUnit.MINUTES).call();
m = graph.openManagement()
i = m.getGraphIndex('byUsername')
m.updateIndex(i, SchemaAction.REMOVE_INDEX).get()
m.commit()
graph.tx().rollback();
mgmt = graph.openManagement();
indexName = 'byUsernameTest2';
propertyKeyName = 'testPropertyName2';
propertyKey = mgmt.makePropertyKey(propertyKeyName).dataType(String.class).cardinality(Cardinality.SINGLE).make();
mgmt.buildIndex(indexName,Vertex.class).addKey(propertyKey).buildCompositeIndex();
mgmt.commit();
graph.tx().commit();
mgmt.awaitGraphIndexStatus(graph, indexName).status(SchemaStatus.REGISTERED).timeout(10, java.time.temporal.ChronoUnit.MINUTES).call();
mgmt.commit();
mgmt = graph.openManagement();
index = mgmt.getGraphIndex('byUsernameTest2');
propkey = mgmt.getPropertyKey('testPropertyName2');
index.getIndexStatus(propkey);
mgmt = graph.openManagement();
index = mgmt.getGraphIndex('byUsernameTest2');
propkey = mgmt.getPropertyKey('testPropertyName2');
index.getIndexStatus(propkey);
您需要等待Titan和DynamoDB注册索引。你可以这样做：
ManagementSystem.awaitGraphIndexStatus(graph, propertyKeyIndexName)
.status(SchemaStatus.REGISTERED)
.timeout(10, java.time.temporal.ChronoUnit.MINUTES) // set timeout to 10 min
.call();
graph.tx().rollback(); //Never create new indexes while a transaction is active
TitanManagement mgmt=graph.openManagement();
PropertyKey propertyKey=getOrCreatePropertyKeyIfNotExist(mgmt, propertyKeyName);
String indexName = makePropertyKeyIndexName(propertyKey);
if (mgmt.getGraphIndex(indexName)==null) {
mgmt.buildIndex(indexName, Vertex.class).addKey(propertyKey).buildCompositeIndex();
mgmt.commit(); // you MUST commit mgmt
graph.tx().commit(); // and commit the transaction too
ManagementSystem.awaitGraphIndexStatus(graph, indexName).status(SchemaStatus.REGISTERED).call();
}else { // already defined.
mgmt.rollback();
graph.tx().rollback();
}
private static PropertyKey getOrCreatePropertyKeyIfNotExist(TitanManagement mgmt, String s) {
PropertyKey key = mgmt.getPropertyKey(s);
if (key != null)
return key;
else
return mgmt.makePropertyKey(s).dataType(String.class).make();
}
private static String makePropertyKeyIndexName(PropertyKey pk) {
return pk.name() + Tokens.INDEX_SUFFIX;
}
确保将正确的索引名传递给
waitgraphindexstatus最后，索引创建过程是不同的，这取决于之前是否使用过被索引的属性键。您是在尝试索引新键还是现有键？谢谢您的回复。这返回了一个关于
ChronoUnit没有这样的属性：ChronoUnit for class:groovysh\u evaluatejava.lang.NullPointerException没有方法的签名：groovysh\u evaluate.getOrCreateIfNotExist（）propertyKeyName