一、場景描述

????公司某工程師執(zhí)行db.giveget_card.drop()，誤將線上表刪除。

????幸好每天都有做備份，這個(gè)時(shí)候就體現(xiàn)了備份的重要性了，哈哈哈。。。

二、模擬故障過程

備份數(shù)據(jù)大小：

rs_test01:PRIMARY>?use?ycsb switched?to?db?ycsb rs_test01:PRIMARY>?db.giveget_card.count(); 3173391

刪除之前，此表有更新。

rs_test01:PRIMARY>?db.giveget_card.insert({id:1}); WriteResult({?"nInserted"?:?1?}) rs_test01:PRIMARY>?db.giveget_card.insert({id:2}); WriteResult({?"nInserted"?:?1?}) rs_test01:PRIMARY>?db.giveget_card.insert({id:3}); WriteResult({?"nInserted"?:?1?}) rs_test01:PRIMARY>?db.giveget_card.insert({id:4}); WriteResult({?"nInserted"?:?1?})

其他表也有更新操作。

rs_test01:PRIMARY>?db.tab.find(); {?"_id"?:?ObjectId("59354ba202d9a99ab2f879c6"),?"name"?:?"a"?} {?"_id"?:?ObjectId("59354ba602d9a99ab2f879c7"),?"name"?:?"b"?} {?"_id"?:?ObjectId("59354ba802d9a99ab2f879c8"),?"name"?:?"c"?} {?"_id"?:?ObjectId("59354baa02d9a99ab2f879c9"),?"name"?:?"d"?}

刪除操作之后，此表和其他表都有更新。

rs_test01:PRIMARY>?db.giveget_card.find(); {?"_id"?:?ObjectId("59354c28d905432aeaccd53c"),?"id"?:?5?} {?"_id"?:?ObjectId("59354c2bd905432aeaccd53d"),?"id"?:?6?} rs_test01:PRIMARY>?db.tab.find(); {?"_id"?:?ObjectId("59354ba202d9a99ab2f879c6"),?"name"?:?"a"?} {?"_id"?:?ObjectId("59354ba602d9a99ab2f879c7"),?"name"?:?"b"?} {?"_id"?:?ObjectId("59354ba802d9a99ab2f879c8"),?"name"?:?"c"?} {?"_id"?:?ObjectId("59354baa02d9a99ab2f879c9"),?"name"?:?"d"?} {?"_id"?:?ObjectId("59354ccfd905432aeaccd542"),?"name"?:?"e"?} {?"_id"?:?ObjectId("59354cd2d905432aeaccd543"),?"name"?:?"f"?}

三、恢復(fù)步驟

1、將備份中 tab 表的 giveget_card.bson 及 giveget_card.metadata.json 文件拷貝到 /tmp/restore/ycsb 目錄（自建目錄)，ycsb 為庫名。

#?cp?/data/backup/rs07/ycsb/giveget_card.*?/tmp/restore/ycsb

2、將備份時(shí)間之后，誤刪操作之前的 oplog 導(dǎo)出，用于恢復(fù)表

#?mongodump?--port?2203?-d?local?-c?oplog.rs?-q?'{"ts"?:?{$gte?:?Timestamp(1496664480,?10430),?$lte?:?Timestamp(1496665113,?10430)}}'?-o?/tmp/oplog

--時(shí)間戳 是使用轉(zhuǎn)換工具轉(zhuǎn)換之后的結(jié)果。

3、使用 bsondump 查看 oplog 日志，找到 drop 操作的時(shí)間戳 1496665069

#?bsondump?/tmp/oplog/local/oplog.rs.bson? {"ts":{"$timestamp":{"t":1496664760,"i":1}},"t":{"$numberLong":"12"},"h":{"$numberLong":"7079172056815894727"},"v":2,"op":"i","ns":"ycsb.giveget_card","o":{"_id":{"$oid":"59354ab8c5308d8c7a9da8b5"},"id":1.0}} {"ts":{"$timestamp":{"t":1496664762,"i":1}},"t":{"$numberLong":"12"},"h":{"$numberLong":"-1797107728294067016"},"v":2,"op":"i","ns":"ycsb.giveget_card","o":{"_id":{"$oid":"59354abac5308d8c7a9da8b6"},"id":2.0}} {"ts":{"$timestamp":{"t":1496664765,"i":1}},"t":{"$numberLong":"12"},"h":{"$numberLong":"8604646791509150392"},"v":2,"op":"i","ns":"ycsb.giveget_card","o":{"_id":{"$oid":"59354abdc5308d8c7a9da8b7"},"id":3.0}} {"ts":{"$timestamp":{"t":1496664768,"i":1}},"t":{"$numberLong":"12"},"h":{"$numberLong":"9018614066505371436"},"v":2,"op":"i","ns":"ycsb.giveget_card","o":{"_id":{"$oid":"59354ac0c5308d8c7a9da8b8"},"id":4.0}} {"ts":{"$timestamp":{"t":1496664994,"i":1}},"t":{"$numberLong":"12"},"h":{"$numberLong":"-4471524661347063602"},"v":2,"op":"c","ns":"ycsb.$cmd","o":{"create":"tab"}} {"ts":{"$timestamp":{"t":1496664994,"i":2}},"t":{"$numberLong":"12"},"h":{"$numberLong":"-4215905958456607246"},"v":2,"op":"i","ns":"ycsb.tab","o":{"_id":{"$oid":"59354ba202d9a99ab2f879c6"},"name":"a"}} {"ts":{"$timestamp":{"t":1496664998,"i":1}},"t":{"$numberLong":"12"},"h":{"$numberLong":"6170506962401844481"},"v":2,"op":"i","ns":"ycsb.tab","o":{"_id":{"$oid":"59354ba602d9a99ab2f879c7"},"name":"b"}} {"ts":{"$timestamp":{"t":1496665000,"i":1}},"t":{"$numberLong":"12"},"h":{"$numberLong":"-8071456063660489895"},"v":2,"op":"i","ns":"ycsb.tab","o":{"_id":{"$oid":"59354ba802d9a99ab2f879c8"},"name":"c"}} {"ts":{"$timestamp":{"t":1496665002,"i":1}},"t":{"$numberLong":"12"},"h":{"$numberLong":"4387884836668659146"},"v":2,"op":"i","ns":"ycsb.tab","o":{"_id":{"$oid":"59354baa02d9a99ab2f879c9"},"name":"d"}} {"ts":{"$timestamp":{"t":1496665069,"i":1}},"t":{"$numberLong":"12"},"h":{"$numberLong":"-6913449254950935781"},"v":2,"op":"c","ns":"ycsb.$cmd","o":{"drop":"giveget_card"}} 2017-06-05T20:27:25.552+0800 10?objects?found

4、將 oplog 的 bson 文件拷貝到相應(yīng)目錄下

#?cp?/tmp/oplog/local/oplog.rs.bson?/tmp/restore/oplog.bson

此時(shí)恢復(fù)的目錄結(jié)構(gòu)：

#?pwd /tmp/restore #?ls oplog.bson??ycsb

? ??

5、至此，所有的準(zhǔn)備操作已經(jīng)做完，恢復(fù)數(shù)據(jù)。

[root@ops-db-test02?restore]#?mongorestore?--port?2203?--oplogReplay?--oplogLimit=1496665069:1?/tmp/restore 2017-06-05T20:36:45.361+0800 building?a?list?of?dbs?and?collections?to?restore?from?/tmp/restore?dir 2017-06-05T20:36:45.364+0800 reading?metadata?for?ycsb.giveget_card?from?/tmp/restore/ycsb/giveget_card.metadata.json 2017-06-05T20:36:45.364+0800 restoring?ycsb.giveget_card?from?/tmp/restore/ycsb/giveget_card.bson 2017-06-05T20:36:48.362+0800 [........................]??ycsb.giveget_card??15.4MB/475MB??(3.2%) 2017-06-05T20:36:51.362+0800 [#.......................]??ycsb.giveget_card??31.1MB/475MB??(6.6%) 2017-06-05T20:36:54.362+0800 [##......................]??ycsb.giveget_card??46.6MB/475MB??(9.8%) 2017-06-05T20:36:57.362+0800 [###.....................]??ycsb.giveget_card??62.1MB/475MB??(13.1%) 2017-06-05T20:37:00.362+0800 [###.....................]??ycsb.giveget_card??76.4MB/475MB??(16.1%) 2017-06-05T20:37:03.362+0800 [####....................]??ycsb.giveget_card??90.7MB/475MB??(19.1%) 2017-06-05T20:37:06.362+0800 [#####...................]??ycsb.giveget_card??105MB/475MB??(22.0%) 2017-06-05T20:37:09.362+0800 [######..................]??ycsb.giveget_card??120MB/475MB??(25.2%) 2017-06-05T20:37:12.362+0800 [######..................]??ycsb.giveget_card??133MB/475MB??(28.0%) 2017-06-05T20:37:15.362+0800 [#######.................]??ycsb.giveget_card??146MB/475MB??(30.8%) 2017-06-05T20:37:18.363+0800 [########................]??ycsb.giveget_card??163MB/475MB??(34.3%) 2017-06-05T20:37:21.362+0800 [########................]??ycsb.giveget_card??178MB/475MB??(37.4%) 2017-06-05T20:37:24.362+0800 [#########...............]??ycsb.giveget_card??196MB/475MB??(41.3%) 2017-06-05T20:37:27.362+0800 [##########..............]??ycsb.giveget_card??214MB/475MB??(45.0%) 2017-06-05T20:37:30.362+0800 [###########.............]??ycsb.giveget_card??231MB/475MB??(48.6%) 2017-06-05T20:37:33.362+0800 [############............]??ycsb.giveget_card??245MB/475MB??(51.5%) 2017-06-05T20:37:36.362+0800 [#############...........]??ycsb.giveget_card??261MB/475MB??(54.8%) 2017-06-05T20:37:39.362+0800 [##############..........]??ycsb.giveget_card??279MB/475MB??(58.7%) 2017-06-05T20:37:42.362+0800 [###############.........]??ycsb.giveget_card??297MB/475MB??(62.5%) 2017-06-05T20:37:45.362+0800 [###############.........]??ycsb.giveget_card??312MB/475MB??(65.8%) 2017-06-05T20:37:48.362+0800 [################........]??ycsb.giveget_card??328MB/475MB??(69.0%) 2017-06-05T20:37:51.362+0800 [#################.......]??ycsb.giveget_card??341MB/475MB??(71.8%) 2017-06-05T20:37:54.362+0800 [#################.......]??ycsb.giveget_card??356MB/475MB??(74.9%) 2017-06-05T20:37:57.362+0800 [##################......]??ycsb.giveget_card??373MB/475MB??(78.5%) 2017-06-05T20:38:00.362+0800 [###################.....]??ycsb.giveget_card??388MB/475MB??(81.7%) 2017-06-05T20:38:03.362+0800 [####################....]??ycsb.giveget_card??405MB/475MB??(85.2%) 2017-06-05T20:38:06.362+0800 [#####################...]??ycsb.giveget_card??419MB/475MB??(88.2%) 2017-06-05T20:38:09.362+0800 [#####################...]??ycsb.giveget_card??434MB/475MB??(91.4%) 2017-06-05T20:38:12.362+0800 [######################..]??ycsb.giveget_card??442MB/475MB??(93.1%) 2017-06-05T20:38:15.362+0800 [#######################.]??ycsb.giveget_card??459MB/475MB??(96.6%) 2017-06-05T20:38:18.362+0800 [#######################.]??ycsb.giveget_card??475MB/475MB??(99.9%) 2017-06-05T20:38:18.427+0800 [########################]??ycsb.giveget_card??475MB/475MB??(100.0%) 2017-06-05T20:38:18.427+0800 restoring?indexes?for?collection?ycsb.giveget_card?from?metadata 2017-06-05T20:38:44.680+0800 finished?restoring?ycsb.giveget_card?(3173391?documents) 2017-06-05T20:38:44.680+0800 replaying?oplog 2017-06-05T20:38:44.739+0800 done

6、查看恢復(fù)的結(jié)果

rs_test01:PRIMARY>?db.giveget_card.find({id?:?{$gte?:?1?}}); {?"_id"?:?ObjectId("59354cb9d905432aeaccd540"),?"id"?:?5?} {?"_id"?:?ObjectId("59354cc0d905432aeaccd541"),?"id"?:?6?} {?"_id"?:?ObjectId("59354ab8c5308d8c7a9da8b5"),?"id"?:?1?} {?"_id"?:?ObjectId("59354abac5308d8c7a9da8b6"),?"id"?:?2?} {?"_id"?:?ObjectId("59354abdc5308d8c7a9da8b7"),?"id"?:?3?} {?"_id"?:?ObjectId("59354ac0c5308d8c7a9da8b8"),?"id"?:?4?}

數(shù)據(jù)內(nèi)容相同，但存儲(chǔ)順序與之前數(shù)據(jù)的存儲(chǔ)順序不同了。

rs_test01:PRIMARY>?db.giveget_card.count(); 3173397

結(jié)果 count= 備份表數(shù)據(jù) 3173391+ 之后的更新數(shù)據(jù) 6 。

????

7、因?yàn)?dump 出來的 oplog 也包含了其他表的操作。查看恢復(fù)過程中有沒有對(duì)其他表產(chǎn)生影響。

rs_test01:PRIMARY>?db.tab.find(); {?"_id"?:?ObjectId("59354ba202d9a99ab2f879c6"),?"name"?:?"a"?} {?"_id"?:?ObjectId("59354ba602d9a99ab2f879c7"),?"name"?:?"b"?} {?"_id"?:?ObjectId("59354ba802d9a99ab2f879c8"),?"name"?:?"c"?} {?"_id"?:?ObjectId("59354baa02d9a99ab2f879c9"),?"name"?:?"d"?} {?"_id"?:?ObjectId("59354ccfd905432aeaccd542"),?"name"?:?"e"?} {?"_id"?:?ObjectId("59354cd2d905432aeaccd543"),?"name"?:?"f"?}

--查看 tab 表的數(shù)據(jù)跟原表數(shù)據(jù)相同，沒有什么影響，說明其他表的日志在空跑。

以上就是備份結(jié)合 oplog 的恢復(fù)操作。

備份很重要！！！ 備份很重要！！！ 備份很重要！！！重要的事情講三遍～～～

轉(zhuǎn)載于:https://blog.51cto.com/11580138/1932502

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