Re: [COMMITTERS] pgsql: Add --synchronous option to pg_receivexlog, for more reliable WA

On 11/17/14 12:34 PM, Fujii Masao wrote:
> Add --synchronous option to pg_receivexlog, for more reliable WAL writing.

The last two sentences of this piece of documentation are a bit
hand-wavy and hard to parse.  Could you clarify this?
    <varlistentry>     <term><option>-S <replaceable>slotname</replaceable></option></term>
<term><option>--slot=<replaceableclass="parameter">slotname</replaceable></option></term>     <listitem>       <para>
    Require <application>pg_receivexlog</application> to use an existing        replication slot (see <xref
linkend="streaming-replication-slots">).       When this option is used, <application>pg_receivexlog</> will report
  a flush position to the server, indicating when each segment has been        synchronized to disk so that the server
canremove that segment if it        is not otherwise needed. <literal>--synchronous</literal> option must        be
specifiedwhen making <application>pg_receivexlog</> run as        synchronous standby by using replication slot.
OtherwiseWAL data        cannot be flushed frequently enough for this to work correctly.       </para>     </listitem>
 </varlistentry>