[sheepdog] [PATCH v3 2/2] sheep/cluster: re-create znode of 'lock-id' if it isn't exists

[Liu Yuan]

On Sun, Jan 19, 2014 at 08:52:59PM +0800, Robin Dong wrote:
> From: Robin Dong <sanbai at taobao.com>
> 
> When a sheep daemon call zk_unlock(), it will remove the whole znode of 'lock-id' and
> make zoo_create() fail in zk_lock() which called by another sheep daemon.
> To avoid this, we should try to create a znode of 'lock-id' if zoo_create() fail.
> 
> Signed-off-by: Robin Dong <sanbai at taobao.com>
> ---
>  sheep/cluster/zookeeper.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/sheep/cluster/zookeeper.c b/sheep/cluster/zookeeper.c
> index ad5a9af..4527db1 100644
> --- a/sheep/cluster/zookeeper.c
> +++ b/sheep/cluster/zookeeper.c
> @@ -1256,6 +1256,10 @@ static void zk_lock(uint64_t lock_id)
>  				     flags, my_path, MAX_NODE_STR_LEN);
>  		if (rc == ZOK)
>  			break;
> +		if (rc == ZNONODE) {
> +			zk_init_node(parent);

Should check error of zk_init_node and handle it.

Thanks
Yuan