question about default leveldb block_size

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I saw that we use 0 as leveldb_block_size [1] as following:

     OPTION(leveldb_block_size, OPT_U64, 0) // leveldb block size

It seems that leveldb don't process 0 as a special value.

 Any reasons for this configuration? why not 4KB or 32KB?



[1] https://github.com/ceph/ceph/blob/master/src/common/config_opts.h#L887
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