80bdab757d
This PR adds `DeleteRange` to `ethdb.KeyValueWriter`. While range deletion using an iterator can be really slow, `DeleteRange` is natively supported by pebble and apparently runs in O(1) time (typically 20-30ms in my tests for removing hundreds of millions of keys and gigabytes of data). For leveldb and memorydb an iterator based fallback is implemented. Note that since the iterator method can be slow and a database function should not unexpectedly block for a very long time, the number of deleted keys is limited at 10000 which should ensure that it does not block for more than a second. ErrTooManyKeys is returned if the range has only been partially deleted. In this case the caller can repeat the call until it finally succeeds. |
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| testsuite.go | ||