Hi,
I’m am testing how mongod (4.2.8) is handling system date modification with replicaSet configuration. There are different problems:
- the 2038 date cf Mongodb replicaset cluster maximum logicalTime => 2038 year max. We have bypassed this problem by clipping the system date to 2037
- the maxAcceptableLogicalClockDriftSecs ste to 1year per default, if the user is changing its system date while running mongoDB instance in a cluster (of only one node). We have bypassed this problem by setting setParameter: maxAcceptableLogicalClockDriftSecs: 2207520000 (70 years). Do you see any drawbacks of doing such configuration ? Moreover we are delete the system.local database at boot since we are having a replicationSet of only 1 node (in order to use change stream functionality).
- the “commit timestamp is less than the oldest timestamp” error that makes mongod crash when applying the replicationSet configuration.
It’s the last problem that is bothering me. I am not sure how to reproduce it but it should occurs when doing this workflow
-
user set the system date to 2070 => mongod crash
-
the user reboots => we are clamping the system date to 2037
-
the user change the system date to 2021
-
the user reboot => after the reboot we are starting the mongod as replicationSet and are applying the below configuration => which make mongod crash
client = pymongo.MongoClient(‘mongodb://127.0.0.1:27017’)
config = {‘_id’: ‘rs0’, ‘members’: [{‘_id’: 0, ‘host’: ‘127.0.0.1:27017’}]}
client.admin.command(‘replSetInitiate’, config)
logs
2020-01-01T01:15:40.582+0000 I NETWORK [listener] connection accepted from 127.0.0.1:45184 #1 (1 connection now open)
2020-01-01T01:15:40.583+0000 I NETWORK [conn1] received client metadata from 127.0.0.1:45184 conn1: { driver: { name: "PyMongo", version: "3.11.0" }, os: { type: "Linux", name: "Linux", architecture: "x86_64", version: "4.15.0-54-lowlatency" }, platform: "CPython 3.7.3.final.0" }
2020-01-01T01:15:40.584+0000 I NETWORK [listener] connection accepted from 127.0.0.1:45186 #2 (2 connections now open)
2020-01-01T01:15:40.584+0000 I NETWORK [conn2] received client metadata from 127.0.0.1:45186 conn2: { driver: { name: "PyMongo", version: "3.11.0" }, os: { type: "Linux", name: "Linux", architecture: "x86_64", version: "4.15.0-54-lowlatency" }, platform: "CPython 3.7.3.final.0" }
2020-01-01T01:15:40.585+0000 I REPL [conn2] replSetInitiate admin command received from client
2020-01-01T01:15:40.585+0000 I REPL [conn2] replSetInitiate config object with 1 members parses ok
2020-01-01T01:15:40.585+0000 I STORAGE [conn2] createCollection: local.system.replset with generated UUID: e389f0cc-6d30-4178-a9e7-7e96ce9e9061 and options: {}
2020-01-01T01:15:40.589+0000 I INDEX [conn2] index build: done building index _id_ on ns local.system.replset
2020-01-01T01:15:40.589+0000 E STORAGE [conn2] WiredTiger error (22) [1577841340:589883][48749:0x7fd095d37700], WT_SESSION.timestamp_transaction: __wt_txn_set_commit_timestamp, 683: commit timestamp (1577841340, 1) is less than the oldest timestamp (2114386099, 16): Invalid argument Raw: [1577841340:589883][4
8749:0x7fd095d37700], WT_SESSION.timestamp_transaction: __wt_txn_set_commit_timestamp, 683: commit timestamp (1577841340, 1) is less than the oldest timestamp (2114386099, 16): Invalid argument
2020-01-01T01:15:40.589+0000 F - [conn2] Fatal assertion 28560 BadValue: timestamp_transaction 22: Invalid argument at src/mongo/db/repl/local_oplog_info.cpp 133
2020-01-01T01:15:40.589+0000 F - [conn2]
***aborting after fassert() failure
2020-01-01T01:15:40.615+0000 F - [conn2] Got signal: 6 (Aborted).
=----- BEGIN BACKTRACE -----
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mongod(_ZN5mongo19ServiceStateMachine15_runNextInGuardENS0_11ThreadGuardE+0x17F) [0x563f6b9b8f9f]
mongod(+0x1187C2C) [0x563f6b9bac2c]
mongod(_ZN5mongo9transport26ServiceExecutorSynchronous8scheduleESt8functionIFvvEENS0_15ServiceExecutor13ScheduleFlagsENS0_23ServiceExecutorTaskNameE+0x182) [0x563f6c816ca2]
mongod(_ZN5mongo19ServiceStateMachine22_scheduleNextWithGuardENS0_11ThreadGuardENS_9transport15ServiceExecutor13ScheduleFlagsENS2_23ServiceExecutorTaskNameENS0_9OwnershipE+0x10D) [0x563f6b9b5e6d]
mongod(_ZN5mongo19ServiceStateMachine15_sourceCallbackENS_6StatusE+0x753) [0x563f6b9b76e3]
mongod(_ZN5mongo19ServiceStateMachine14_sourceMessageENS0_11ThreadGuardE+0x316) [0x563f6b9b8296]
mongod(_ZN5mongo19ServiceStateMachine15_runNextInGuardENS0_11ThreadGuardE+0xDB) [0x563f6b9b8efb]
mongod(+0x1187C2C) [0x563f6b9bac2c]
mongod(+0x1FE410B) [0x563f6c81710b]
mongod(+0x26399D5) [0x563f6ce6c9d5]
mongod(+0x2639A34) [0x563f6ce6ca34]
libpthread.so.0(+0x7FA3) [0x7fd0a8fa8fa3]
libc.so.6(clone+0x3F) [0x7fd0a8ed94cf]
----- END BACKTRACE -----
Questions:
- What does the “commit timestamp is less than the oldest timestamp” means ? What is the oldest_timestamp used in __wt_txn_set_commit_timestamp, ? How can I retrieve it ? How to recover the application from such state ?
- Do you see any drawbacks of using setParameter: maxAcceptableLogicalClockDriftSecs: 2207520000 (70 years) ?