[sheepdog] [PATCH 4/8] make IO request to wait when recovery is in RW_INIT

Yibin Shen zituan at taobao.com
Tue May 22 10:27:00 CEST 2012


On Tue, May 22, 2012 at 10:51 AM, levin li <levin108 at gmail.com> wrote:
> From: levin li <xingke.lwp at taobao.com>
>
> When recovery is in RW_INIT state, the IO request would be
> marked as recovering, then the sender will busy retrying,
> we should make the request wait until recovery enters RW_RUN
> state to determine whether the object requested is in recovery
> instead of just return SD_RES_NEW_NODE_VER.
>
> Signed-off-by: levin li <xingke.lwp at taobao.com>
> ---
>  sheep/group.c      |    1 +
>  sheep/recovery.c   |   25 +++++++++++++++++++++++--
>  sheep/sdnet.c      |   11 ++++++++---
>  sheep/sheep_priv.h |    2 ++
>  4 files changed, 34 insertions(+), 5 deletions(-)
>
> diff --git a/sheep/group.c b/sheep/group.c
> index 3266c38..63742a2 100644
> --- a/sheep/group.c
> +++ b/sheep/group.c
> @@ -1379,6 +1379,7 @@ int create_cluster(int port, int64_t zone, int nr_vnodes)
>        INIT_LIST_HEAD(&sys->request_queue);
>        INIT_LIST_HEAD(&sys->event_queue);
>        INIT_LIST_HEAD(&sys->wait_epoch_queue);
> +       INIT_LIST_HEAD(&sys->wait_rw_queue);
>
>        ret = send_join_request(&sys->this_node);
>        if (ret != 0)
> diff --git a/sheep/recovery.c b/sheep/recovery.c
> index 3b5caa3..0d05661 100644
> --- a/sheep/recovery.c
> +++ b/sheep/recovery.c
> @@ -526,6 +526,13 @@ int node_in_recovery(void)
>        return !!recovering_work;
>  }
>
> +int is_recovery_init(void)
> +{
> +       struct recovery_work *rw = recovering_work;
> +
> +       return rw->state == RW_INIT;
> +}
> +
>  int is_recovering_oid(uint64_t oid)
>  {
>        struct recovery_work *rw = recovering_work;
> @@ -573,6 +580,19 @@ int is_recovering_oid(uint64_t oid)
>        return 0;
>  }
>
> +static void resume_wait_recovery_queue(void)
> +{
> +       struct request *req, *t;
> +
> +       list_for_each_entry_safe(req, t, &sys->wait_rw_queue,
> +                                request_list) {
> +               dprintf("resume wait oid %" PRIx64 "\n", req->local_oid);
> +               list_del(&req->request_list);
> +               list_add_tail(&req->request_list, &sys->request_queue);
> +               process_request_event_queues();
> +       }
> +}
> +
>  static void do_recover_main(struct work *work)
>  {
>        struct recovery_work *rw = container_of(work, struct recovery_work, work);
> @@ -582,9 +602,10 @@ static void do_recover_main(struct work *work)
>
>  again:
>        if (rw->prior_count == 0) {
> -               if (rw->state == RW_INIT)
> +               if (rw->state == RW_INIT) {
>                        rw->state = RW_RUN;
> -               else if (!rw->retry)
> +                       resume_wait_recovery_queue();
> +               } else if (!rw->retry)
>                        rw->done++;
>        }
>
> diff --git a/sheep/sdnet.c b/sheep/sdnet.c
> index e1334c8..565625e 100644
> --- a/sheep/sdnet.c
> +++ b/sheep/sdnet.c
> @@ -227,9 +227,14 @@ static int check_request(struct request *req)
>        if (is_recovering_oid(req->local_oid)) {
>                if (req->rq.flags & SD_FLAG_CMD_IO_LOCAL) {
>                        /* Sheep peer request */
> -                       req->rp.result = SD_RES_NEW_NODE_VER;
> -                       sys->nr_outstanding_io++;
> -                       req->work.done(&req->work);
> +                       if (is_recovery_init())
> +                               list_add_tail(&req->request_list,
> +                                               &sys->wait_rw_queue);
we know do_recovery_work() contain fill_obj_list() operation,
In a large scale cluster,
this function is really time consuming, It seems not a good idea to
block all I/O request in RW_INIT phase.
> +                       else
> +                               req->rp.result = SD_RES_NEW_NODE_VER;
> +                               sys->nr_outstanding_io++;
> +                               req->work.done(&req->work);
> +                       }
>                } else {
>                        /* Gateway request */
>                        list_add_tail(&req->request_list, &sys->req_wait_for_obj_list);
> diff --git a/sheep/sheep_priv.h b/sheep/sheep_priv.h
> index 00c299a..5e804c4 100644
> --- a/sheep/sheep_priv.h
> +++ b/sheep/sheep_priv.h
> @@ -137,6 +137,7 @@ struct cluster_info {
>        struct list_head request_queue;
>        struct list_head event_queue;
>        struct list_head wait_epoch_queue;
> +       struct list_head wait_rw_queue;
>        struct event_struct *cur_cevent;
>        int nr_outstanding_io;
>        int nr_outstanding_reqs;
> @@ -300,6 +301,7 @@ int get_obj_list(const struct sd_list_req *, struct sd_list_rsp *, void *);
>  int start_recovery(uint32_t epoch);
>  void resume_recovery_work(void);
>  int is_recovering_oid(uint64_t oid);
> +int is_recovery_init(void);
>  int node_in_recovery(void);
>
>  int write_object(struct vnode_info *vnodes, uint32_t node_version,
> --
> 1.7.10
>
> --
> sheepdog mailing list
> sheepdog at lists.wpkg.org
> http://lists.wpkg.org/mailman/listinfo/sheepdog

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