{"action":"created","comment":{"url":"https://api.github.com/repos/cockroachdb/cockroach/pulls/comments/37064251","id":37064251,"diff_hunk":"@@ -302,10 +310,11 @@ func endTxnCall(commit bool) proto.Call {\n func (txn *Txn) exec(retryable func(txn *Txn) error) (err error) {\n \t// Run retryable in a retry loop until we encounter a success or\n \t// error condition this loop isn't capable of handling.\n+\n \tfor r := retry.Start(txn.db.txnRetryOptions); r.Next(); {\n \t\ttxn.haveTxnWrite, txn.haveEndTxn = false, false // always reset before [re]starting txn\n \t\tif err = retryable(txn); err == nil {\n-\t\t\tif !txn.haveEndTxn && txn.haveTxnWrite {\n+\t\t\tif !txn.haveEndTxn && txn.txn.Writing {","path":"client/txn.go","position":46,"original_position":46,"commit_id":"bb23de240267ed615bc451e49ab019cf2b46ab49","original_commit_id":"bb23de240267ed615bc451e49ab019cf2b46ab49","user":{"login":"tamird","id":1535036,"avatar_url":"https://avatars.githubusercontent.com/u/1535036?v=3","gravatar_id":"","url":"https://api.github.com/users/tamird","html_url":"https://github.com/tamird","followers_url":"https://api.github.com/users/tamird/followers","following_url":"https://api.github.com/users/tamird/following{/other_user}","gists_url":"https://api.github.com/users/tamird/gists{/gist_id}","starred_url":"https://api.github.com/users/tamird/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tamird/subscriptions","organizations_url":"https://api.github.com/users/tamird/orgs","repos_url":"https://api.github.com/users/tamird/repos","events_url":"https://api.github.com/users/tamird/events{/privacy}","received_events_url":"https://api.github.com/users/tamird/received_events","type":"User","site_admin":false},"body":"I think the `haveEndTxn` call is redundant now that you're discarding the EndTransaction call in `send`","created_at":"2015-08-14T10:09:13Z","updated_at":"2015-08-14T10:09:13Z","html_url":"https://github.com/cockroachdb/cockroach/pull/2093#discussion_r37064251","pull_request_url":"https://api.github.com/repos/cockroachdb/cockroach/pulls/2093","_links":{"self":{"href":"https://api.github.com/repos/cockroachdb/cockroach/pulls/comments/37064251"},"html":{"href":"https://github.com/cockroachdb/cockroach/pull/2093#discussion_r37064251"},"pull_request":{"href":"https://api.github.com/repos/cockroachdb/cockroach/pulls/2093"}}},"pull_request":{"url":"https://api.github.com/repos/cockroachdb/cockroach/pulls/2093","id":42372596,"html_url":"https://github.com/cockroachdb/cockroach/pull/2093","diff_url":"https://github.com/cockroachdb/cockroach/pull/2093.diff","patch_url":"https://github.com/cockroachdb/cockroach/pull/2093.patch","issue_url":"https://api.github.com/repos/cockroachdb/cockroach/issues/2093","number":2093,"state":"open","locked":false,"title":"client EndTransaction handling wrt txn.Writing","user":{"login":"tschottdorf","id":5076964,"avatar_url":"https://avatars.githubusercontent.com/u/5076964?v=3","gravatar_id":"","url":"https://api.github.com/users/tschottdorf","html_url":"https://github.com/tschottdorf","followers_url":"https://api.github.com/users/tschottdorf/followers","following_url":"https://api.github.com/users/tschottdorf/following{/other_user}","gists_url":"https://api.github.com/users/tschottdorf/gists{/gist_id}","starred_url":"https://api.github.com/users/tschottdorf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tschottdorf/subscriptions","organizations_url":"https://api.github.com/users/tschottdorf/orgs","repos_url":"https://api.github.com/users/tschottdorf/repos","events_url":"https://api.github.com/users/tschottdorf/events{/privacy}","received_events_url":"https://api.github.com/users/tschottdorf/received_events","type":"User","site_admin":false},"body":"We have a field `Writing` on `proto.Transaction` which is set to true at `TxnCoordSender` when the first intent has been laid down (and which never flips back to `false` until the `Txn` ends).\r\n`client.Txn`, on the other hand, has state `txn.haveTxnWrite` which tracks whether a write has been\r\nsent or been queued for sending in the current **attempt**.\r\n\r\nThis change makes sure that we use `txn.Writing` to determine whether an `EndTransaction` call is necessary. Additionally, it ensures that if no such call is necessary, we don't send `EndTransaction` (which currently amounts to an error, and it is better to keep it that way to more reliably spot bugs). The latter actually requires `haveTxnWrite and Writing`; everything else just uses 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