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From: Konstantin Osipov <kostja@tarantool.org>
To: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: tarantool-patches@freelists.org
Subject: Re: [PATCH 3/3] wal: create empty xlog on shutdown
Date: Wed, 27 Jun 2018 20:29:21 +0300	[thread overview]
Message-ID: <20180627172921.GF28358@chai> (raw)
In-Reply-To: <1499b12de12125f1258324b83e3fbb0e1d1d0587.1529075903.git.vdavydov.dev@gmail.com>

* Vladimir Davydov <vdavydov.dev@gmail.com> [18/06/15 23:28]:
>  recovery_finalize(struct recovery *r)
>  {
>  	recovery_close_log(r);
> -
> -	/*
> -	 * Check if next xlog exists. If it's true this xlog is
> -	 * corrupted and we should rename it (to avoid getting
> -	 * problem on the next xlog write with the same name).
> -	 * Possible reasons are:
> -	 *  - last xlog has corrupted rows
> -	 *  - last xlog has corrupted header
> -	 *  - last xlog has zero size
> -	 */
> -	char *name = xdir_format_filename(&r->wal_dir,
> -					  vclock_sum(&r->vclock),
> -					  NONE);
> -	if (access(name, F_OK) == 0) {
> -		say_info("rename corrupted xlog %s", name);
> -		char to[PATH_MAX];
> -		snprintf(to, sizeof(to), "%s.corrupted", name);
> -		if (rename(name, to) != 0) {
> -			tnt_raise(SystemError,
> -				  "%s: can't rename corrupted xlog",
> -				  name);
> -		}
> -	}

I agree this hunk should be moved to wal.c, but I don't understand
why it has to be done in wal thread.

Please make it obvious by leaving only the necessary parts in
wal_init_f and adding a comment.

> --- a/src/box/wal.c
> +++ b/src/box/wal.c
> @@ -310,6 +310,39 @@ wal_thread_start()
>  	cpipe_set_max_input(&wal_thread.wal_pipe, IOV_MAX);
>  }
>  
> +static int
> +wal_init_f(struct cbus_call_msg *msg)

Please add a formal comment for this function.

>  /**
>   * Initialize WAL writer.
>   *
> @@ -332,6 +365,11 @@ wal_init(enum wal_mode wal_mode, const char *wal_dirname,
>  	if (xdir_scan(&writer->wal_dir))
>  		return -1;
>  
> +	struct cbus_call_msg msg;
> +	if (cbus_call(&wal_thread.wal_pipe, &wal_thread.tx_pipe, &msg,
> +		      wal_init_f, NULL, TIMEOUT_INFINITY) != 0)
> +		return -1;
> +

> +	/*
> +	 * Create a new empty WAL on shutdown so that we don't have
> +	 * to rescan the last WAL to find the instance vclock.
> +	 */
> +	if (writer->wal_mode != WAL_NONE &&
> +	    xdir_create_xlog(&writer->wal_dir, &writer->current_wal,
> +			     &writer->vclock) == 0)
> +		xlog_close(&writer->current_wal, false);

In case there is an existing empty xlog file, this function fails
to create a new one and returns an error which you ignore.

Please handle this case nicely and avoid trying to create a new
xlog file if it is not necessary.

>  

-- 
Konstantin Osipov, Moscow, Russia, +7 903 626 22 32
http://tarantool.io - www.twitter.com/kostja_osipov

  reply	other threads:[~2018-06-27 17:29 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-08 17:34 [PATCH v2 00/11] Replica rejoin Vladimir Davydov
2018-06-08 17:34 ` [PATCH v2 01/11] box: retrieve instance uuid before starting local recovery Vladimir Davydov
2018-06-08 17:51   ` Konstantin Osipov
2018-06-08 17:34 ` [PATCH v2 02/11] box: refactor hot standby recovery Vladimir Davydov
2018-06-08 17:34 ` [PATCH v2 03/11] box: retrieve end vclock before starting local recovery Vladimir Davydov
2018-06-14 12:58   ` Konstantin Osipov
2018-06-08 17:34 ` [PATCH v2 04/11] box: open the port " Vladimir Davydov
2018-06-13 20:43   ` Konstantin Osipov
2018-06-14  8:31     ` Vladimir Davydov
2018-06-14 12:59       ` Konstantin Osipov
2018-06-15 15:48         ` [PATCH 0/3] Speed up recovery in case rebootstrap is not needed Vladimir Davydov
2018-06-15 15:48           ` [PATCH 1/3] xlog: erase eof marker when reopening existing file for writing Vladimir Davydov
2018-06-27 17:09             ` Konstantin Osipov
2018-06-15 15:48           ` [PATCH 2/3] wal: rollback vclock on write failure Vladimir Davydov
2018-06-27 17:22             ` Konstantin Osipov
2018-06-15 15:48           ` [PATCH 3/3] wal: create empty xlog on shutdown Vladimir Davydov
2018-06-27 17:29             ` Konstantin Osipov [this message]
2018-06-08 17:34 ` [PATCH v2 05/11] box: connect to remote peers before starting local recovery Vladimir Davydov
2018-06-13 20:45   ` Konstantin Osipov
2018-06-14  8:34     ` Vladimir Davydov
2018-06-14 12:59       ` Konstantin Osipov
2018-06-08 17:34 ` [PATCH v2 06/11] box: factor out local recovery function Vladimir Davydov
2018-06-13 20:50   ` Konstantin Osipov
2018-06-08 17:34 ` [PATCH v2 07/11] applier: inquire oldest vclock on connect Vladimir Davydov
2018-06-13 20:51   ` Konstantin Osipov
2018-06-14  8:40     ` Vladimir Davydov
2018-06-08 17:34 ` [PATCH v2 08/11] replication: rebootstrap instance on startup if it fell behind Vladimir Davydov
2018-06-13 20:55   ` Konstantin Osipov
2018-06-14  8:58     ` Vladimir Davydov
2018-06-08 17:34 ` [PATCH v2 09/11] vinyl: simplify vylog recovery from backup Vladimir Davydov
2018-06-08 17:34 ` [PATCH v2 10/11] vinyl: pass flags to vy_recovery_new Vladimir Davydov
2018-06-13 20:56   ` Konstantin Osipov
2018-06-08 17:34 ` [PATCH v2 11/11] vinyl: implement rebootstrap support Vladimir Davydov
2018-06-10 12:02   ` Vladimir Davydov

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