Concurrency Bug in Alexol #8
Description
Reproduce the bug:
deadlock when running:
./build/microbench \ --keys_file=./datasets/covid \ --keys_file_type=binary \ --read=0.7 --insert=0.2 \ --scan=0.1 \ --operations_num=200000000 \ --table_size=-1 \ --init_table_ratio=0.5 \ --thread_num=32 \ --index=alexol
The cause of the bug (I guess):
thread 1 insert and trigger resize/split in node A. (it will be deleted then, so the lock of node A will never release)
thread 2 scan node A (waiting for the lock releasing and keep retry)
A Solution?
additional "deleted" flag to indicate the node is deleted, the scan should retravel from the root.