Details
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Bug
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Status: Closed
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Critical - P2
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Resolution: Fixed
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3.4.11
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None
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Fully Compatible
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ALL
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v3.6, v3.4
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Platforms 2018-02-12
Description
Unable to start queryable mongod for the backup of mongod version 3.4.10.
indexes on admin.system.user on mongod 3.4.10:
db.system.users.getIndexes()
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[
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{
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"v" : 2,
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"key" : {
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"_id" : 1
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},
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"name" : "_id_",
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"ns" : "admin.system.users"
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}
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]
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indexes on admin.system.user on mongod 3.4.11:
db.system.users.getIndexes()
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[
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{
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"v" : 2,
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"key" : {
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"_id" : 1
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},
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"name" : "_id_",
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"ns" : "admin.system.users"
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},
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{
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"v" : 2,
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"unique" : true,
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"key" : {
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"user" : 1,
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"db" : 1
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},
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"name" : "user_1_db_1",
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"ns" : "admin.system.users"
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}
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]
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Queryable restore uses the latest mongod available to start queryable mongod. So for the backup of mongod 3.4.10 it will use queryable mongod 3.4.11. While starting queryable mongod, it tries to create the extra index introduced in mongod 3.4.11, and it fails because queryable mongod is started in read only mode. Following is the error encountered:
2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] MongoDB starting : pid=20564 port=27812 dbpath=/srv/10gen/bgrid-prod/head01/queryable/5a741effdf9db17ed7c5b844/dbpath/ 64-bit host=brs-qr-2.vpc8.10gen.cc
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] db version v3.4.11
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] git version: 34f5bec2c9d827d71828fe858167f89a28b29a2a
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] allocator: tcmalloc
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] modules: enterprise
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] build environment:
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] distmod: rhel62
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] distarch: x86_64
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] target_arch: x86_64
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2018-02-02T08:19:12.240+0000 I CONTROL [initandlisten] options: { config: "/srv/10gen/bgrid-prod/head01/queryable/5a741effdf9db17ed7c5b844/dbpath/conf.yaml", net: { bindIp: "0.0.0.0", port: 27812, ssl: { CAFile: "/srv/10gen/bgrid-prod/head01/queryable/5a741effdf9db17ed7c5b844/dbpath/ca.pem", PEMKeyFile: "/srv/10gen/bgrid-prod/head01/queryable/5a741effdf9db17ed7c5b844/dbpath/serverIdentity.pem", mode: "requireSSL" } }, queryableBackup: { apiUri: "127.0.0.1:8095", memoryQuotaMB: 8192.0, snapshotId: "5a741effdf9db17ed7c5b844" }, security: { authorization: "enabled" }, setParameter: { authenticationMechanisms: "MONGODB-X509" }, storage: { dbPath: "/srv/10gen/bgrid-prod/head01/queryable/5a741effdf9db17ed7c5b844/dbpath/", engine: "queryable_wt", queryableBackupMode: true, wiredTiger: { engineConfig: { cacheSizeGB: 6.0 } } }, systemLog: { destination: "file", path: "/srv/10gen/bgrid-prod/head01/queryable/5a741effdf9db17ed7c5b844/mongod.log" } }
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2018-02-02T08:19:12.258+0000 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=6144M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),extensions=[local={entry=queryableWtFsCreate,early_load=true,config={apiUri="127.0.0.1:8095",snapshotId="5a741effdf9db17ed7c5b844",dbpath="/srv/10gen/bgrid-prod/head01/queryable/5a741effdf9db17ed7c5b844/dbpath"}},],readonly=true,
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2018-02-02T08:19:18.792+0000 W STORAGE [initandlisten] Detected configuration for non-active storage engine wiredTiger when current storage engine is queryable_wt
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2018-02-02T08:19:18.955+0000 I ACCESS [initandlisten] No authorization index detected on admin.system.users collection. Attempting to recover by creating an index with spec: { ns: "admin.system.users", v: 2, name: "user_1_db_1", key: { user: 1, db: 1 }, unique: true }
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2018-02-02T08:19:18.955+0000 F ACCESS [initandlisten] Failed to regenerate index for admin.system.users. Exception: Cannot execute a write operation in read-only mode
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2018-02-02T08:19:18.955+0000 I STORAGE [initandlisten] IllegalOperation: Cannot execute a write operation in read-only mode
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