源为mongo 6.0 如果有collection 开启了changestream，源库执行原像数据清理时会在oplog中产生一条管理命令，操作config.system.preimages, 下游mongo版本低于6.0会出错 #933
Description
源为mongo 6.0 如果有collection 开启了changestream，源库执行原像数据清理时会在oplog中产生一条管理命令，操作config.system.preimages, 下游mongo版本低于6.0会出错
{
"ts": {
"T": 1763966666,
"I": 1
},
"t": 9,
"h": null,
"v": 2,
"op": "c",
"ns": "admin.$cmd",
"o": [
{
"Key": "applyOps",
"Value": [
[
{
"Key": "op",
"Value": "d"
},
{
"Key": "ns",
"Value": "config.system.preimages"
},
{
"Key": "ui",
"Value": {
"Subtype": 4,
"Data": "FwPQyNoWRbe2vB3xxxptUR8g=="
}
},
{
"Key": "o",
"Value": [
{
"Key": "_id",
"Value": [
{
"Key": "nsUUID",
"Value": {
"Subtype": 4,
"Data": "LIV6H0eeRASplFMLdecxUQ=="
}
},
{
"Key": "ts",
"Value": {
"T": 1758155667,
"I": 24
}
},
{
"Key": "applyOpsIndex",
"Value": 0
}
]
}
]
}
],
[
{
"Key": "op",
"Value": "d"
},
{
"Key": "ns",
"Value": "config.system.preimages"
},
{
"Key": "ui",
"Value": {
"Subtype": 4,
"Data": "FwPQyNoWRbe2xxxvB3xptUR8g=="
}
},
{
"Key": "o",
"Value": [
{
"Key": "_id",
"Value": [
{
"Key": "nsUUID",
"Value": {
"Subtype": 4,
"Data": "LIV6H0eeRASplFMLdecxUQ=="
}
},
{
"Key": "ts",
"Value": {
"T": 175855668,
"I": 2
}
},
{
"Key": "applyOpsIndex",
"Value": 0
}
]
}
]
}
]
]
}
],
"o2": null,
"PrevOpTime": null
}
代码中需要在 admin.$cmd中过滤掉 config.system.preimages 相关操作， 因为同版本或者高版其实也不需要同步这条命令，可以依赖DB自身的清理机制