pkuwm commented on a change in pull request #761: Add REST read endpoints to
helix-rest for metadata store directory
URL: https://github.com/apache/helix/pull/761#discussion_r379219384
##########
File path:
helix-rest/src/main/java/org/apache/helix/rest/server/resources/metadatastore/MetadataStoreDirectoryAccessor.java
##########
@@ -66,24 +67,44 @@ private void postConstruct() {
}
/**
- * Gets all metadata store realms in a namespace with the endpoint.
+ * Gets all existing namespaces in the routing metadata store at endpoint:
+ * "GET /metadata-store-namespaces"
+ *
+ * @return Json response of all namespaces.
+ */
+ @GET
+ @Path("/metadata-store-namespaces")
+ public Response getAllNamespaces() {
+ Collection<String> namespaces = _metadataStoreDirectory.getAllNamespaces();
+ Map<String, Collection<String>> responseMap =
+
ImmutableMap.of(MetadataStoreRoutingConstants.METADATA_STORE_NAMESPACES,
namespaces);
+
+ return JSONRepresentation(responseMap);
+ }
+
+ /**
+ * Gets all metadata store realms in a namespace at path: "GET
/metadata-store-realms",
+ * or gets a metadata store realm with the sharding key at path:
+ * "GET /metadata-store-realms?sharding-key={sharding-key}"
*
* @return Json representation of all realms.
*/
@GET
@Path("/metadata-store-realms")
- public Response getAllMetadataStoreRealms() {
- Map<String, Collection<String>> responseMap;
+ public Response getAllMetadataStoreRealms(@QueryParam("sharding-key") String
shardingKey) {
Review comment:
I've thought about this carefully. As it is necessary, I've defined a POJO
class `MetadataStoreShardingKey` to represent the object mapping. The response
will look like:
```
{
"metadataStoreRealms": ["realm-0", "realm-1"]
}
```
or single ream with sharding key:
```
{
"shardingKey": "/a/b/c",
"realm": "realm-0"
}
```
I definitely agree that if the response of object is complex (has more
fields), we would need POJO classes to represent the responses.
For the time being, since the most of the responses are quite simple: a
list, I don't think we want to make it complex . I've tried to make all json
responses to have key-value mappings.
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