{"action":"created","issue":{"url":"https://api.github.com/repos/apache/spark/issues/5064","labels_url":"https://api.github.com/repos/apache/spark/issues/5064/labels{/name}","comments_url":"https://api.github.com/repos/apache/spark/issues/5064/comments","events_url":"https://api.github.com/repos/apache/spark/issues/5064/events","html_url":"https://github.com/apache/spark/pull/5064","id":62319195,"number":5064,"title":"[SPARK-5523][Core][Streaming] Add a cache for hostname in TaskMetrics to decrease the memory usage and GC overhead","user":{"login":"jerryshao","id":850797,"avatar_url":"https://avatars.githubusercontent.com/u/850797?v=3","gravatar_id":"","url":"https://api.github.com/users/jerryshao","html_url":"https://github.com/jerryshao","followers_url":"https://api.github.com/users/jerryshao/followers","following_url":"https://api.github.com/users/jerryshao/following{/other_user}","gists_url":"https://api.github.com/users/jerryshao/gists{/gist_id}","starred_url":"https://api.github.com/users/jerryshao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jerryshao/subscriptions","organizations_url":"https://api.github.com/users/jerryshao/orgs","repos_url":"https://api.github.com/users/jerryshao/repos","events_url":"https://api.github.com/users/jerryshao/events{/privacy}","received_events_url":"https://api.github.com/users/jerryshao/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":4,"created_at":"2015-03-17T07:34:29Z","updated_at":"2015-03-18T06:03:07Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/5064","html_url":"https://github.com/apache/spark/pull/5064","diff_url":"https://github.com/apache/spark/pull/5064.diff","patch_url":"https://github.com/apache/spark/pull/5064.patch"},"body":"Hostname in TaskMetrics will be created through deserialization, mostly the number of hostname is only the order of number of cluster node, so adding a cache layer to dedup the object could reduce the memory usage and alleviate GC overhead, especially for long-running and fast job generation applications like Spark Streaming."},"comment":{"url":"https://api.github.com/repos/apache/spark/issues/comments/82764172","html_url":"https://github.com/apache/spark/pull/5064#issuecomment-82764172","issue_url":"https://api.github.com/repos/apache/spark/issues/5064","id":82764172,"user":{"login":"SparkQA","id":8108735,"avatar_url":"https://avatars.githubusercontent.com/u/8108735?v=3","gravatar_id":"","url":"https://api.github.com/users/SparkQA","html_url":"https://github.com/SparkQA","followers_url":"https://api.github.com/users/SparkQA/followers","following_url":"https://api.github.com/users/SparkQA/following{/other_user}","gists_url":"https://api.github.com/users/SparkQA/gists{/gist_id}","starred_url":"https://api.github.com/users/SparkQA/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/SparkQA/subscriptions","organizations_url":"https://api.github.com/users/SparkQA/orgs","repos_url":"https://api.github.com/users/SparkQA/repos","events_url":"https://api.github.com/users/SparkQA/events{/privacy}","received_events_url":"https://api.github.com/users/SparkQA/received_events","type":"User","site_admin":false},"created_at":"2015-03-18T06:03:07Z","updated_at":"2015-03-18T06:03:07Z","body":"  [Test build #28776 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/28776/consoleFull) for   PR 5064 at commit [`e4de2b4`](https://github.com/apache/spark/commit/e4de2b4c31ad37ab7bb88fd3df1ea1bab53b02f5).\n * This patch merges cleanly."}}