[Gluster-devel] Query regarding dictionary logic

Vijay Bellur vbellur at redhat.com
Tue Apr 30 06:14:35 UTC 2019

Hi Mohit,

On Mon, Apr 29, 2019 at 7:15 AM Mohit Agrawal <moagrawa at redhat.com> wrote:

> Hi All,
>   I was just looking at the code of dict, I have one query current
> dictionary logic.
>   I am not able to understand why we use hash_size is 1 for a
> dictionary.IMO with the
>   hash_size of 1 dictionary always work like a list, not a hash, for every
> lookup
>   in dictionary complexity is O(n).
>   Before optimizing the code I just want to know what was the exact reason
> to define
>   hash_size is 1?

This is a good question. I looked up the source in gluster's historic repo
[1] and hash_size is 1 even there. So, this could have been the case since
the first version of the dictionary code.

Would you be able to run some tests with a larger hash_size and share your


[1] https://github.com/gluster/historic/blob/master/libglusterfs/src/dict.c

>   Please share your view on the same.
> Thanks,
> Mohit Agrawal
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