{"action":"created","issue":{"url":"https://api.github.com/repos/apache/spark/issues/16732","repository_url":"https://api.github.com/repos/apache/spark","labels_url":"https://api.github.com/repos/apache/spark/issues/16732/labels{/name}","comments_url":"https://api.github.com/repos/apache/spark/issues/16732/comments","events_url":"https://api.github.com/repos/apache/spark/issues/16732/events","html_url":"https://github.com/apache/spark/pull/16732","id":203853166,"number":16732,"title":"[SPARK-19368][MLlib] BlockMatrix.toIndexedRowMatrix() optimization for sparse matrices","user":{"login":"uzadude","id":15645757,"avatar_url":"https://avatars.githubusercontent.com/u/15645757?v=3","gravatar_id":"","url":"https://api.github.com/users/uzadude","html_url":"https://github.com/uzadude","followers_url":"https://api.github.com/users/uzadude/followers","following_url":"https://api.github.com/users/uzadude/following{/other_user}","gists_url":"https://api.github.com/users/uzadude/gists{/gist_id}","starred_url":"https://api.github.com/users/uzadude/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/uzadude/subscriptions","organizations_url":"https://api.github.com/users/uzadude/orgs","repos_url":"https://api.github.com/users/uzadude/repos","events_url":"https://api.github.com/users/uzadude/events{/privacy}","received_events_url":"https://api.github.com/users/uzadude/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-01-29T06:09:58Z","updated_at":"2017-01-29T06:12:16Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/16732","html_url":"https://github.com/apache/spark/pull/16732","diff_url":"https://github.com/apache/spark/pull/16732.diff","patch_url":"https://github.com/apache/spark/pull/16732.patch"},"body":"## What changes were proposed in this pull request?\r\n\r\nOptimization [SPARK-12869] was made for dense matrices but caused great performance issue for sparse matrices because manipulating them is very inefficient. When manipulating sparse matrices in Breeze we better use VectorBuilder.\r\n\r\n## How was this patch tested?\r\n\r\nchecked it against a use case that we have that after moving to Spark 2 took 6.5 hours instead of 20 mins. After the change it is back to 20 mins again.\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/apache/spark/issues/comments/275896321","html_url":"https://github.com/apache/spark/pull/16732#issuecomment-275896321","issue_url":"https://api.github.com/repos/apache/spark/issues/16732","id":275896321,"user":{"login":"AmplabJenkins","id":4031291,"avatar_url":"https://avatars.githubusercontent.com/u/4031291?v=3","gravatar_id":"","url":"https://api.github.com/users/AmplabJenkins","html_url":"https://github.com/AmplabJenkins","followers_url":"https://api.github.com/users/AmplabJenkins/followers","following_url":"https://api.github.com/users/AmplabJenkins/following{/other_user}","gists_url":"https://api.github.com/users/AmplabJenkins/gists{/gist_id}","starred_url":"https://api.github.com/users/AmplabJenkins/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/AmplabJenkins/subscriptions","organizations_url":"https://api.github.com/users/AmplabJenkins/orgs","repos_url":"https://api.github.com/users/AmplabJenkins/repos","events_url":"https://api.github.com/users/AmplabJenkins/events{/privacy}","received_events_url":"https://api.github.com/users/AmplabJenkins/received_events","type":"User","site_admin":false},"created_at":"2017-01-29T06:12:16Z","updated_at":"2017-01-29T06:12:16Z","body":"Can one of the admins verify this patch?"}}
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