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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6640) Improve efficiency of KafkaAdminClient.describeTopics()
Date Wed, 14 Mar 2018 21:59:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16399498#comment-16399498

ASF GitHub Bot commented on KAFKA-6640:

hachikuji closed pull request #4694: KAFKA-6640; Improve efficiency of KafkaAdminClient.describeTopics()
URL: https://github.com/apache/kafka/pull/4694

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):

diff --git a/clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java b/clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java
index 36cbe6cad00..e455b9ce81c 100644
--- a/clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java
+++ b/clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java
@@ -1276,15 +1276,16 @@ public DescribeTopicsResult describeTopics(final Collection<String>
             void handleResponse(AbstractResponse abstractResponse) {
                 MetadataResponse response = (MetadataResponse) abstractResponse;
                 // Handle server responses for particular topics.
+                Cluster cluster = response.cluster();
+                Map<String, Errors> errors = response.errors();
                 for (Map.Entry<String, KafkaFutureImpl<TopicDescription>> entry
: topicFutures.entrySet()) {
                     String topicName = entry.getKey();
                     KafkaFutureImpl<TopicDescription> future = entry.getValue();
-                    Errors topicError = response.errors().get(topicName);
+                    Errors topicError = errors.get(topicName);
                     if (topicError != null) {
-                    Cluster cluster = response.cluster();
                     if (!cluster.topics().contains(topicName)) {
                         future.completeExceptionally(new InvalidTopicException("Topic " +
topicName + " not found."));


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> Improve efficiency of KafkaAdminClient.describeTopics()
> -------------------------------------------------------
>                 Key: KAFKA-6640
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6640
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Dong Lin
>            Assignee: Dong Lin
>            Priority: Major
> Currently in KafkaAdminClient.describeTopics(), for each topic in the request, an complete
map of cluster and errors will be constructed for every topic and partition. This unnecessarily
increases the complexity of describeTopics() to O(n^2).

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