pkuwm commented on a change in pull request #751: Implement
getAllMappingUnderPath and getMetadataStoreRealm
URL: https://github.com/apache/helix/pull/751#discussion_r378477655
##########
File path:
helix-rest/src/main/java/org/apache/helix/rest/metadatastore/accessor/ZkRoutingDataReader.java
##########
@@ -53,55 +53,45 @@ public ZkRoutingDataReader(String namespace, String
zkAddress,
throw new IllegalArgumentException("Zk address cannot be null or
empty!");
}
_zkAddress = zkAddress;
- _zkClient = DedicatedZkClientFactory.getInstance()
- .buildZkClient(new HelixZkClient.ZkConnectionConfig(zkAddress),
- new HelixZkClient.ZkClientConfig().setZkSerializer(new
ZNRecordSerializer()));
+ _zkClient = DedicatedZkClientFactory.getInstance().buildZkClient(
+ new HelixZkClient.ZkConnectionConfig(zkAddress),
+ new HelixZkClient.ZkClientConfig().setZkSerializer(new
ZNRecordSerializer()));
_routingDataListener = routingDataListener;
if (_routingDataListener != null) {
// Subscribe child changes
_zkClient.subscribeChildChanges(MetadataStoreRoutingConstants.ROUTING_DATA_PATH,
this);
// Subscribe data changes
for (String child :
_zkClient.getChildren(MetadataStoreRoutingConstants.ROUTING_DATA_PATH)) {
- _zkClient
-
.subscribeDataChanges(MetadataStoreRoutingConstants.ROUTING_DATA_PATH + "/" +
child,
- this);
+ _zkClient.subscribeDataChanges(
+ MetadataStoreRoutingConstants.ROUTING_DATA_PATH + "/" + child,
this);
}
}
}
/**
* Returns (realm, list of ZK path sharding keys) mappings.
* @return Map <realm, list of ZK path sharding keys>
- * @throws InvalidRoutingDataException
+ * @throws InvalidRoutingDataException - when the node on
+ * MetadataStoreRoutingConstants.ROUTING_DATA_PATH is missing
*/
- public Map<String, List<String>> getRoutingData()
- throws InvalidRoutingDataException {
+ public Map<String, List<String>> getRoutingData() throws
InvalidRoutingDataException {
Map<String, List<String>> routingData = new HashMap<>();
- List<String> children;
+ List<String> allRealmAddresses;
try {
- children =
_zkClient.getChildren(MetadataStoreRoutingConstants.ROUTING_DATA_PATH);
+ allRealmAddresses =
_zkClient.getChildren(MetadataStoreRoutingConstants.ROUTING_DATA_PATH);
} catch (ZkNoNodeException e) {
throw new InvalidRoutingDataException(
"Routing data directory ZNode " +
MetadataStoreRoutingConstants.ROUTING_DATA_PATH
+ " does not exist. Routing ZooKeeper address: " + _zkAddress);
}
- if (children == null || children.isEmpty()) {
- throw new InvalidRoutingDataException(
- "There are no metadata store realms defined. Routing ZooKeeper
address: " + _zkAddress);
- }
- for (String child : children) {
+ for (String realmAddress : allRealmAddresses) {
ZNRecord record =
- _zkClient.readData(MetadataStoreRoutingConstants.ROUTING_DATA_PATH +
"/" + child);
+ _zkClient.readData(MetadataStoreRoutingConstants.ROUTING_DATA_PATH +
"/" + realmAddress);
Review comment:
It seems quite several places use this concatenation
`MetadataStoreRoutingConstants.ROUTING_DATA_PATH + "/" + realmAddress`. I
suggest creating a static util method to build the path, which may look cleaner.
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