File 0400-kernel-Improve-net_ticktime-docs.patch of Package erlang

Overview Repositories Revisions Requests Users Attributes Meta

File 0400-kernel-Improve-net_ticktime-docs.patch of Package erlang (Revision 66a224e208ffe9ee89602bad56a74dfa)

Currently displaying revision 66a224e208ffe9ee89602bad56a74dfa , Show latest

From 4f2fa2edabcc5807a879a6f60ecb2f28d5ad6085 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Wed, 18 Jul 2018 16:52:41 +0200
Subject: [PATCH] kernel: Improve net_ticktime docs

---
 lib/kernel/doc/src/kernel_app.xml | 37 ++++++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 15 deletions(-)

diff --git a/lib/kernel/doc/src/kernel_app.xml b/lib/kernel/doc/src/kernel_app.xml
index 3914226a3e..ccb7d17d25 100644
--- a/lib/kernel/doc/src/kernel_app.xml
+++ b/lib/kernel/doc/src/kernel_app.xml
@@ -310,24 +310,31 @@
 <tag><c>net_ticktime = TickTime</c></tag>
 <item>
 <marker id="net_ticktime"></marker>
- Specifies the <c>net_kernel</c> tick time. <c>TickTime</c>
- is specified in seconds. Once every <c>TickTime/4</c> second, all
- connected nodes are ticked (if anything else is written
- to a node). If nothing is received from another node
- within the last four tick times, that node is considered
- to be down. This ensures that nodes that are not responding,
- for reasons such as hardware errors, are considered to be
- down.
- The time <c>T</c>, in which a node that is not responding is
- detected, is calculated as <c><![CDATA[MinT < T < MaxT]]></c>, where:
+ Specifies the <c>net_kernel</c> tick time in seconds. This is the
+	approximate time a connected node may be unresponsive until it is
+	considered down and thereby disconnected.
+	Once every <c>TickTime/4</c> seconds, each connected node is ticked
+	if nothing has been sent to it during that last <c>TickTime/4</c>
+	interval. A tick is a small package sent on the connection. A connected
+	node is considered to be down if no ticks or payload packages have been
+	received during the last four <c>TickTime/4</c> intervals. This ensures
+	that nodes that are not responding, for reasons such as hardware errors,
+	are considered to be down.
+ As the availability is only checked every <c>TickTime/4</c> seconds,
+	the actual time <c>T</c> a node have been unresponsive when
+	detected may vary between <c>MinT</c> and <c>MaxT</c>,
+	where:
 <code type="none">
 MinT = TickTime - TickTime / 4
 MaxT = TickTime + TickTime / 4</code>
- <c>TickTime</c> defaults to <c>60</c> (seconds). Thus,
- <c><![CDATA[45 < T < 75]]></c> seconds.
- Notice that all communicating nodes are to have the same
- <c>TickTime</c> value specified.
- Normally, a terminating node is detected immediately.
+ <c>TickTime</c> defaults to <c>60</c> seconds. Thus,
+ <c><![CDATA[45 < T < 75]]></c> seconds.
+ Notice that all communicating nodes are to have the
+	same <c>TickTime</c> value specified, as it determines both the
+	frequency of outgoing ticks and the expected frequency of incominging
+	ticks.
+ Normally, a terminating node is detected immediately by the transport
+	protocol (like TCP/IP).
 </item>
 <tag><c>shutdown_timeout = integer() | infinity</c></tag>
 <item>
-- 
2.16.4

Places

File 0400-kernel-Improve-net_ticktime-docs.patch of Package erlang (Revision 66a224e208ffe9ee89602bad56a74dfa)

Places