BF.SCANDUMP key iterator
@bloom,
@write,
@slow,
Begins an incremental save of the Bloom filter.
This command is useful for large Bloom filters that cannot fit into the DUMP and RESTORE model.
The first time this command is called, the value of iter should be 0.
This command returns successive (iter, data) pairs until (0, NULL) to indicate completion.
keyis key name for a Bloom filter to save.
iteratorIterator value; either 0 or the iterator from a previous invocation of this command
redis> BF.RESERVE bf 0.1 10
OK
redis> BF.ADD bf item1
1) (integer) 1
redis> BF.SCANDUMP bf 0
1) (integer) 1
2) "\x01\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x05\x00\x00\x00\x02\x00\x00\x00\b\x00\x00\x00\x00\x00\x00\x00@\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x9a\x99\x99\x99\x99\x99\xa9?J\xf7\xd4\x9e\xde\xf0\x18@\x05\x00\x00\x00\n\x00\x00\x00\x00\x00\x00\x00\x00"
redis> BF.SCANDUMP bf 1
1) (integer) 9
2) "\x01\b\x00\x80\x00\x04 \x00"
redis> BF.SCANDUMP bf 9
1) (integer) 0
2) ""
redis> DEL bf
(integer) 1
redis> BF.LOADCHUNK bf 1 "\x01\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x05\x00\x00\x00\x02\x00\x00\x00\b\x00\x00\x00\x00\x00\x00\x00@\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x9a\x99\x99\x99\x99\x99\xa9?J\xf7\xd4\x9e\xde\xf0\x18@\x05\x00\x00\x00\n\x00\x00\x00\x00\x00\x00\x00\x00"
OK
redis> BF.LOADCHUNK bf 9 "\x01\b\x00\x80\x00\x04 \x00"
OK
redis> BF.EXISTS bf item1
(integer) 1Python code:
chunks = []
iter = 0
while True:
iter, data = BF.SCANDUMP(key, iter)
if iter == 0:
break
else:
chunks.append([iter, data])
# Load it back
for chunk in chunks:
iter, data = chunk
BF.LOADCHUNK(key, iter, data)| Redis Enterprise |
Redis Cloud |
Notes |
|---|---|---|
| ✅ Supported |
✅ Flexible & Annual ✅ Free & Fixed |
One of the following:
The Iterator is passed as input to the next invocation of BF.SCANDUMP. If Iterator is 0, then it means iteration has completed.
The iterator-data pair should also be passed to BF.LOADCHUNK when restoring the filter.