FrankChen021 commented on a change in pull request #12096:
URL: https://github.com/apache/druid/pull/12096#discussion_r774835897
##########
File path:
indexing-service/src/main/java/org/apache/druid/indexing/overlord/ZkWorker.java
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@@ -63,6 +66,27 @@ public ZkWorker(Worker worker, PathChildrenCache
statusCache, final ObjectMapper
this.statusCache = statusCache;
this.cacheConverter = (ChildData input) ->
JacksonUtils.readValue(jsonMapper, input.getData(),
TaskAnnouncement.class);
+ this.taskIdExtractor = createTaskIdExtractor(jsonMapper);
+ }
+
+ static java.util.function.Function<ChildData, String>
createTaskIdExtractor(final ObjectMapper jsonMapper)
+ {
+ return (ChildData input) -> {
+ try {
+ JsonNode parent = jsonMapper.readTree(input.getData());
Review comment:
`readTree` still deserializes all the input to object. Since here we
just want to get the value of `id` field, I think we can use jackson's
streaming parser api to get the id so that we don't need to parse all the
string content.
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