{"action":"created","comment":{"url":"https://api.github.com/repos/coreos/etcd/pulls/comments/43653056","id":43653056,"diff_hunk":"@@ -0,0 +1,218 @@\n+// Copyright 2015 CoreOS, Inc.\n+//\n+// Licensed under the Apache License, Version 2.0 (the \"License\");\n+// you may not use this file except in compliance with the License.\n+// You may obtain a copy of the License at\n+//\n+//     http://www.apache.org/licenses/LICENSE-2.0\n+//\n+// Unless required by applicable law or agreed to in writing, software\n+// distributed under the License is distributed on an \"AS IS\" BASIS,\n+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+// See the License for the specific language governing permissions and\n+// limitations under the License.\n+\n+// Package logutil includes utilities to faciliate logging.\n+package logutil\n+\n+import (\n+\t\"fmt\"\n+\t\"sync\"\n+\t\"time\"\n+\n+\t\"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/pkg/capnslog\"\n+)\n+\n+var (\n+\tdefaultMergePeriod   = time.Second\n+\tpermanentMergePeriod time.Duration","path":"pkg/logutil/merge_logger.go","position":28,"original_position":28,"commit_id":"41ccd62e948af2b8ee13b93694ba255dd6fee519","original_commit_id":"41ccd62e948af2b8ee13b93694ba255dd6fee519","user":{"login":"xiang90","id":4479947,"avatar_url":"https://avatars.githubusercontent.com/u/4479947?v=3","gravatar_id":"","url":"https://api.github.com/users/xiang90","html_url":"https://github.com/xiang90","followers_url":"https://api.github.com/users/xiang90/followers","following_url":"https://api.github.com/users/xiang90/following{/other_user}","gists_url":"https://api.github.com/users/xiang90/gists{/gist_id}","starred_url":"https://api.github.com/users/xiang90/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/xiang90/subscriptions","organizations_url":"https://api.github.com/users/xiang90/orgs","repos_url":"https://api.github.com/users/xiang90/repos","events_url":"https://api.github.com/users/xiang90/events{/privacy}","received_events_url":"https://api.github.com/users/xiang90/received_events","type":"User","site_admin":false},"body":"`permanent` is not a good description for what you want this to achieve i believe.","created_at":"2015-11-02T17:11:43Z","updated_at":"2015-11-02T17:11:43Z","html_url":"https://github.com/coreos/etcd/pull/3783#discussion_r43653056","pull_request_url":"https://api.github.com/repos/coreos/etcd/pulls/3783","_links":{"self":{"href":"https://api.github.com/repos/coreos/etcd/pulls/comments/43653056"},"html":{"href":"https://github.com/coreos/etcd/pull/3783#discussion_r43653056"},"pull_request":{"href":"https://api.github.com/repos/coreos/etcd/pulls/3783"}}},"pull_request":{"url":"https://api.github.com/repos/coreos/etcd/pulls/3783","id":49320336,"html_url":"https://github.com/coreos/etcd/pull/3783","diff_url":"https://github.com/coreos/etcd/pull/3783.diff","patch_url":"https://github.com/coreos/etcd/pull/3783.patch","issue_url":"https://api.github.com/repos/coreos/etcd/issues/3783","number":3783,"state":"open","locked":false,"title":"rafthttp: use MergeLogger for rafthttp logging","user":{"login":"yichengq","id":2976232,"avatar_url":"https://avatars.githubusercontent.com/u/2976232?v=3","gravatar_id":"","url":"https://api.github.com/users/yichengq","html_url":"https://github.com/yichengq","followers_url":"https://api.github.com/users/yichengq/followers","following_url":"https://api.github.com/users/yichengq/following{/other_user}","gists_url":"https://api.github.com/users/yichengq/gists{/gist_id}","starred_url":"https://api.github.com/users/yichengq/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/yichengq/subscriptions","organizations_url":"https://api.github.com/users/yichengq/orgs","repos_url":"https://api.github.com/users/yichengq/repos","events_url":"https://api.github.com/users/yichengq/events{/privacy}","received_events_url":"https://api.github.com/users/yichengq/received_events","type":"User","site_admin":false},"body":"rafthttp logs repeated messages whenever the same connection error\r\nhappens, and it easily becomes log spamming.\r\nUse MergeLogger as the default logger to merge repeated log lines.\r\n\r\nThis performs the same functionality as logging control in peerStatus.\r\nSo I remove the logging control in peerStatus and only use MergeLogger.\r\n\r\nA leader logs like this:\r\n```\r\n[one follower is online]\r\n2015-10-30 16:02:31.315429 E | rafthttp: failed to write fd422379fda50e48 on pipeline (dial tcp 127.0.0.1:32380: getsockopt: connection refused) [merged 85 repeated lines in 6.531586103s]\r\n2015-10-30 16:02:31.315460 E | rafthttp: failed to dial fd422379fda50e48 on stream MsgApp v2 (dial tcp 127.0.0.1:32380: getsockopt: connection refused) [merged 63 repeated lines in 6.454672895s]\r\n2015-10-30 16:02:31.315475 E | rafthttp: failed to dial fd422379fda50e48 on stream Message (dial tcp 127.0.0.1:32380: getsockopt: connection refused) [merged 63 repeated lines in 6.454677171s]\r\n```\r\n\r\nA slow-snapshot-recovery follower acts like this:\r\n```\r\n2015-10-30 16:02:41.361546 W | rafthttp: dropped MsgHeartbeatResp to 8211f1d0f64f3269 since pipeline's sending buffer is full\r\n2015-10-30 16:02:41.361627 W | rafthttp: dropped MsgAppResp to 8211f1d0f64f3269 since pipeline's sending buffer is full\r\n2015-10-30 16:02:41.361857 W | rafthttp: dropped MsgProp to 8211f1d0f64f3269 since pipeline's sending buffer is full\r\n2015-10-30 16:02:43.285128 W | rafthttp: dropped MsgHeartbeatResp to 8211f1d0f64f3269 since pipeline's sending buffer is full [merged 41 repeated lines in 1.923469239s]\r\n2015-10-30 16:02:43.285215 W | rafthttp: dropped MsgAppResp to 8211f1d0f64f3269 since pipeline's sending buffer is full [merged 15 repeated lines in 1.923559031s]\r\n```\r\n\r\nfixes #3462 in a general 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