The GitHub Actions job "CI" on kvrocks.git has failed.
Run started by GitHub user git-hulk (triggered by git-hulk).
Head commit for run:
bfa1d0ddf60cb372514211eb37f369690d2f2011 / git-hulk <hulk.webs...@gmail.com>
Implement an unify key-value iterator for Kvrocks
Currently, we need to iterate all keys in the database in different places like
the cluster migration and kvrocks2redis, but don't have an iterator for this
purpose.
It's very error-prone to implement this in different places since Kvrocks may
add
a new column family in the future, and we must be careful to iterate all keys
in all column families.
This would be a burden for maintenance, So we want to implement an iterator for
iterating keys.
```C++
DBIter iter(storage, read_option);
for (iter.Seek(); iter.Valid(); iter.Next()) {
if (iter.Type() == kRedisString || iter.Type() == kRedisJSON) {
// the string/json type didn't have subkeys
continue;
}
auto subkey_iter = iter.GetSubKeyIterator();
for (subkey_iter.Seek(); subkey_iter.Valid(); subkey_iter.Next()) {
// handle its subkey and value here
}
}
```
When using this iterator, it will iterate the metadata column family first and
check its type,
if it's not a string or json, then it will iterate the corresponding column
family to get subkeys.
That said, if we have a key foo with type hash, then the iterator will iterate
foo and foo:field1, foo:field2, and so on.
This solution can bring those benefits:
- The codes look more intutive
- Can reuse this iterator if we want to iterate keys only
Report URL: https://github.com/apache/kvrocks/actions/runs/7488824959
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