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From: Cyrill Gorcunov via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>
Cc: tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH 5/6] replication: use 'score' to find a join-master
Date: Thu, 10 Jun 2021 18:02:46 +0300
Message-ID: <YMIplkkvVQF87yw9@grain> (raw)
In-Reply-To: <6675abcfa409f1fd6e05a7e7852b42e1a08d1795.1622849790.git.v.shpilevoy@tarantool.org>

On Sat, Jun 05, 2021 at 01:37:59AM +0200, Vladislav Shpilevoy wrote:
> +		int score = 0;
>  		/*
> -		 * Try to find a replica which has already left
> -		 * orphan mode.
> +		 * Prefer instances not configured as read-only via box.cfg, and
> +		 * not being in read-only state due to any other reason. The
> +		 * config is stronger because if it is configured as read-only,
> +		 * it is in read-only state for sure, until the config is
> +		 * changed.
>  		 */
> -		if (ballot->is_ro && !leader_ballot->is_ro)
> +		if (!ballot->is_ro_cfg)
> +			score += 5;
> +		if (!ballot->is_ro)
> +			score += 1;
> +		if (leader_score < score)
> +			goto elect;
> +		if (score < leader_score)
>  			continue;

Vlad, if only I'm not missing something obvious we can do simplier
without branching at all, say

		score = (ballot->is_booted << 3) |
			(ballot->is_ro_cfg << 2) |
			(ballot->is_ro << 1);

up to you, just an idea.
...
>  		if (cmp == 0 && tt_uuid_compare(&replica->uuid,
>  						&leader->uuid) > 0)
>  			continue;
> +	elect:

seems extra tab here?

>  		leader = replica;
> +		leader_score = score;
>  	}
>  	return leader;
>  }

  parent reply	other threads:[~2021-06-10 15:02 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-04 23:37 [Tarantool-patches] [PATCH 0/6] Instance join should prefer booted instances Vladislav Shpilevoy via Tarantool-patches
2021-06-04 23:37 ` [Tarantool-patches] [PATCH 1/6] replication: refactor replicaset_leader() Vladislav Shpilevoy via Tarantool-patches
2021-06-10 13:54   ` Serge Petrenko via Tarantool-patches
2021-06-04 23:37 ` [Tarantool-patches] [PATCH 2/6] replication: ballot.is_ro -> is_ro_cfg Vladislav Shpilevoy via Tarantool-patches
2021-06-10 13:56   ` Serge Petrenko via Tarantool-patches
2021-06-04 23:37 ` [Tarantool-patches] [PATCH 3/6] replication: ballot.is_loading -> is_ro Vladislav Shpilevoy via Tarantool-patches
2021-06-10 13:58   ` Serge Petrenko via Tarantool-patches
2021-06-04 23:37 ` [Tarantool-patches] [PATCH 4/6] replication: introduce ballot.is_booted Vladislav Shpilevoy via Tarantool-patches
2021-06-10 14:02   ` Serge Petrenko via Tarantool-patches
2021-06-04 23:37 ` [Tarantool-patches] [PATCH 5/6] replication: use 'score' to find a join-master Vladislav Shpilevoy via Tarantool-patches
2021-06-10 14:06   ` Serge Petrenko via Tarantool-patches
2021-06-10 15:02   ` Cyrill Gorcunov via Tarantool-patches [this message]
2021-06-10 20:09     ` Vladislav Shpilevoy via Tarantool-patches
2021-06-10 21:28       ` Cyrill Gorcunov via Tarantool-patches
2021-06-04 23:38 ` [Tarantool-patches] [PATCH 6/6] replication: prefer to join from booted replicas Vladislav Shpilevoy via Tarantool-patches
2021-06-06 17:06   ` Vladislav Shpilevoy via Tarantool-patches
2021-06-10 14:14   ` Serge Petrenko via Tarantool-patches
2021-06-06 17:03 ` [Tarantool-patches] [PATCH 7/6] raft: test join to a raft cluster Vladislav Shpilevoy via Tarantool-patches
2021-06-06 23:01   ` Vladislav Shpilevoy via Tarantool-patches
2021-06-10 14:17   ` Serge Petrenko via Tarantool-patches
2021-06-10 15:03 ` [Tarantool-patches] [PATCH 0/6] Instance join should prefer booted instances Cyrill Gorcunov via Tarantool-patches
2021-06-11 20:56 ` Vladislav Shpilevoy via Tarantool-patches

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