{"action":"created","comment":{"url":"https://api.github.com/repos/CorfuDB/CorfuDB/pulls/comments/206706544","pull_request_review_id":142172913,"id":206706544,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIwNjcwNjU0NA==","diff_hunk":"@@ -86,4 +87,22 @@\n      * Clears all data and resets all segment handlers.\n      */\n     void reset();\n+\n+    default OverwriteCause verifyOverwriteCauseForAddress(long address, LogData entry) {\n+        LogData oldEntry = read(address);\n+        OverwriteCause cause = OverwriteCause.DIFF_DATA;\n+\n+        if (oldEntry.isHole()) {\n+            cause = OverwriteCause.HOLE;\n+        } else if (entry.getData() != null && oldEntry.getData() != null) {\n+            if (oldEntry.getData().length == entry.getData().length) {","path":"infrastructure/src/main/java/org/corfudb/infrastructure/log/StreamLog.java","position":20,"original_position":20,"commit_id":"c8b68ddb8437e0f1e2c724ea8a21b10e699f252c","original_commit_id":"c8b68ddb8437e0f1e2c724ea8a21b10e699f252c","user":{"login":"annym","id":19276204,"node_id":"MDQ6VXNlcjE5Mjc2MjA0","avatar_url":"https://avatars0.githubusercontent.com/u/19276204?v=4","gravatar_id":"","url":"https://api.github.com/users/annym","html_url":"https://github.com/annym","followers_url":"https://api.github.com/users/annym/followers","following_url":"https://api.github.com/users/annym/following{/other_user}","gists_url":"https://api.github.com/users/annym/gists{/gist_id}","starred_url":"https://api.github.com/users/annym/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/annym/subscriptions","organizations_url":"https://api.github.com/users/annym/orgs","repos_url":"https://api.github.com/users/annym/repos","events_url":"https://api.github.com/users/annym/events{/privacy}","received_events_url":"https://api.github.com/users/annym/received_events","type":"User","site_admin":false},"body":"The cause of overwrite exception would be HOLE, regardless of what you are trying to write, which won't go through due to this exception.","created_at":"2018-07-31T22:41:43Z","updated_at":"2018-07-31T22:41:43Z","html_url":"https://github.com/CorfuDB/CorfuDB/pull/1401#discussion_r206706544","pull_request_url":"https://api.github.com/repos/CorfuDB/CorfuDB/pulls/1401","author_association":"COLLABORATOR","_links":{"self":{"href":"https://api.github.com/repos/CorfuDB/CorfuDB/pulls/comments/206706544"},"html":{"href":"https://github.com/CorfuDB/CorfuDB/pull/1401#discussion_r206706544"},"pull_request":{"href":"https://api.github.com/repos/CorfuDB/CorfuDB/pulls/1401"}},"in_reply_to_id":206667375},"pull_request":{"url":"https://api.github.com/repos/CorfuDB/CorfuDB/pulls/1401","id":204614073,"node_id":"MDExOlB1bGxSZXF1ZXN0MjA0NjE0MDcz","html_url":"https://github.com/CorfuDB/CorfuDB/pull/1401","diff_url":"https://github.com/CorfuDB/CorfuDB/pull/1401.diff","patch_url":"https://github.com/CorfuDB/CorfuDB/pull/1401.patch","issue_url":"https://api.github.com/repos/CorfuDB/CorfuDB/issues/1401","number":1401,"state":"open","locked":false,"title":"Transaction Abort Exception Cause for slow writers","user":{"login":"annym","id":19276204,"node_id":"MDQ6VXNlcjE5Mjc2MjA0","avatar_url":"https://avatars0.githubusercontent.com/u/19276204?v=4","gravatar_id":"","url":"https://api.github.com/users/annym","html_url":"https://github.com/annym","followers_url":"https://api.github.com/users/annym/followers","following_url":"https://api.github.com/users/annym/following{/other_user}","gists_url":"https://api.github.com/users/annym/gists{/gist_id}","starred_url":"https://api.github.com/users/annym/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/annym/subscriptions","organizations_url":"https://api.github.com/users/annym/orgs","repos_url":"https://api.github.com/users/annym/repos","events_url":"https://api.github.com/users/annym/events{/privacy}","received_events_url":"https://api.github.com/users/annym/received_events","type":"User","site_admin":false},"body":"## Overview\r\n\r\nThe cause CONFLICT is reported whenever two transaction conflict over\r\nthe same keys for a given stream(s). This change corrects the overload\r\nof this abort cause for the case of slow writers, i.e., whenever a\r\nwriter fails to write given that the designated address is continuously\r\noverwritten (perhaps hole filled) by a faster reader. This is due to the\r\nfact that it is not really conflicting with any other stream, the cause\r\nof abort is that you are overwritten by a fast reader in the system.\r\n\r\nWhy should this be merged: this is an issue that has been reported by the Application Layer as conflicting keys/streams show up being NULL which makes no sense out of a Conflicting Transaction for upper layers.\r\n\r\nRelated issue(s) (if applicable): #1399\r\n\r\n\r\n## Checklist (Definition of Done):\r\n\r\n- [ ] There are no TODOs left in the code\r\n- [ ] [Coding conventions](https://github.com/CorfuDB/CorfuDB/wiki/Corfu-Style-Guidelines) (e.g. for logging, unit tests) have been followed\r\n- [ ] Change is covered by automated tests\r\n- [ ] Public API has Javadoc\r\n","created_at":"2018-07-28T22:37:20Z","updated_at":"2018-07-31T22:41:43Z","closed_at":null,"merged_at":null,"merge_commit_sha":"702ddbaebf9ee25b5181f992eeb397abe81b7746","assignee":{"login":"annym","id":19276204,"node_id":"MDQ6VXNlcjE5Mjc2MjA0","avatar_url":"https://avatars0.githubusercontent.com/u/19276204?v=4","gravatar_id":"","url":"https://api.github.com/users/annym","html_url":"https://github.com/annym","followers_url":"https://api.github.com/users/annym/followers","following_url":"https://api.github.com/users/annym/following{/other_user}","gists_url":"https://api.github.com/users/annym/gists{/gist_id}","starred_url":"https://api.github.com/users/annym/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/annym/subscriptions","organizations_url":"https://api.github.com/users/annym/orgs","repos_url":"https://api.github.com/users/annym/repos","events_url":"https://api.github.com/users/annym/events{/privacy}","received_events_url":"https://api.github.com/users/annym/received_events","type":"User","site_admin":false},"assignees":[{"login":"annym","id":19276204,"node_id":"MDQ6VXNlcjE5Mjc2MjA0","avatar_url":"https://avatars0.githubusercontent.com/u/19276204?v=4","gravatar_id":"","url":"https://api.github.com/users/annym","html_url":"https://github.com/annym","followers_url":"https://api.github.com/users/annym/followers","following_url":"https://api.github.com/users/annym/following{/other_user}","gists_url":"https://api.github.com/users/annym/gists{/gist_id}","starred_url":"https://api.github.com/users/annym/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/annym/subscriptions","organizations_url":"https://api.github.com/users/annym/orgs","repos_url":"https://api.github.com/users/annym/repos","events_url":"https://api.github.com/users/annym/events{/privacy}","received_events_url":"https://api.github.com/users/annym/received_events","type":"User","site_admin":false}],"requested_reviewers":[{"login":"xnull","id":314292,"node_id":"MDQ6VXNlcjMxNDI5Mg==","avatar_url":"https://avatars0.githubusercontent.com/u/314292?v=4","gravatar_id":"","url":"https://api.github.com/users/xnull","html_url":"https://github.com/xnull","followers_url":"https://api.github.com/users/xnull/followers","following_url":"https://api.github.com/users/xnull/following{/other_user}","gists_url":"https://api.github.com/users/xnull/gists{/gist_id}","starred_url":"https://api.github.com/users/xnull/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/xnull/subscriptions","organizations_url":"https://api.github.com/users/xnull/orgs","repos_url":"https://api.github.com/users/xnull/repos","events_url":"https://api.github.com/users/xnull/events{/privacy}","received_events_url":"https://api.github.com/users/xnull/received_events","type":"User","site_admin":false},{"login":"no2chem","id":6496984,"node_id":"MDQ6VXNlcjY0OTY5ODQ=","avatar_url":"https://avatars0.githubusercontent.com/u/6496984?v=4","gravatar_id":"","url":"https://api.github.com/users/no2chem","html_url":"https://github.com/no2chem","followers_url":"https://api.github.com/users/no2chem/followers","following_url":"https://api.github.com/users/no2chem/following{/other_user}","gists_url":"https://api.github.com/users/no2chem/gists{/gist_id}","starred_url":"https://api.github.com/users/no2chem/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/no2chem/subscriptions","organizations_url":"https://api.github.com/users/no2chem/orgs","repos_url":"https://api.github.com/users/no2chem/repos","events_url":"https://api.github.com/users/no2chem/events{/privacy}","received_events_url":"https://api.github.com/users/no2chem/received_events","type":"User","site_admin":false}],"requested_teams":[],"labels":[{"id":650774061,"node_id":"MDU6TGFiZWw2NTA3NzQwNjE=","url":"https://api.github.com/repos/CorfuDB/CorfuDB/labels/bug","name":"bug","color":"d93f0b","default":true}],"milestone":null,"commits_url":"https://api.github.com/repos/CorfuDB/CorfuDB/pulls/1401/commits","review_comments_url":"https://api.github.com/repos/CorfuDB/CorfuDB/pulls/1401/comments","review_comment_url":"https://api.github.com/repos/CorfuDB/CorfuDB/pulls/comments{/number}","comments_url":"https://api.github.com/repos/CorfuDB/CorfuDB/issues/1401/comments","statuses_url":"https://api.github.com/repos/CorfuDB/CorfuDB/statuses/c8b68ddb8437e0f1e2c724ea8a21b10e699f252c","head":{"label":"CorfuDB:overwriteException","ref":"overwriteException","sha":"c8b68ddb8437e0f1e2c724ea8a21b10e699f252c","user":{"login":"CorfuDB","id":10199273,"node_id":"MDEyOk9yZ2FuaXphdGlvbjEwMTk5Mjcz","avatar_url":"https://avatars0.githubusercontent.com/u/10199273?v=4","gravatar_id":"","url":"https://api.github.com/users/CorfuDB","html_url":"https://github.com/CorfuDB","followers_url":"https://api.github.com/users/CorfuDB/followers","following_url":"https://api.github.com/users/CorfuDB/following{/other_user}","gists_url":"https://api.github.com/users/CorfuDB/gists{/gist_id}","star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