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Posted to commits@couchdb.apache.org by rn...@apache.org on 2019/09/25 08:29:48 UTC
[couchdb-documentation] branch erl_max_ports created (now a0027ff)
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rnewson pushed a change to branch erl_max_ports
in repository https://gitbox.apache.org/repos/asf/couchdb-documentation.git.
at a0027ff Correct misleading commentary on ERL_MAX_PORTS
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new a0027ff Correct misleading commentary on ERL_MAX_PORTS
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[couchdb-documentation] 01/01: Correct misleading commentary on
ERL_MAX_PORTS
Posted by rn...@apache.org.
This is an automated email from the ASF dual-hosted git repository.
rnewson pushed a commit to branch erl_max_ports
in repository https://gitbox.apache.org/repos/asf/couchdb-documentation.git
commit a0027ff51f1b45abb8c590bf6b30331fbd7c7085
Author: Robert Newson <rn...@apache.org>
AuthorDate: Wed Sep 25 09:27:18 2019 +0100
Correct misleading commentary on ERL_MAX_PORTS
ERL_MAX_PORTS affects the number of Erlang ports allowed at once, and
defaults to 1024. An Erlang port is created via erlang:open_port and
is used to launch an executable like couchjs. It is not, directly, a
limit on TCP sockets or file descriptors.
---
src/install/troubleshooting.rst | 7 ++++---
src/maintenance/performance.rst | 7 -------
2 files changed, 4 insertions(+), 10 deletions(-)
diff --git a/src/install/troubleshooting.rst b/src/install/troubleshooting.rst
index acb5f8b..20011dd 100644
--- a/src/install/troubleshooting.rst
+++ b/src/install/troubleshooting.rst
@@ -201,9 +201,10 @@ but the short answer is that you should decrease ``ulimit -n`` or define
erlang stack trace contains ``system_limit``, ``open_port``
-----------------------------------------------------------
-Erlang has a default limit of 1024 ports, where each FD, tcp connection, and
-linked-in driver uses one port. You seem to have exceeded this. You can
-change it at runtime using the ``ERL_MAX_PORTS`` env variable.
+Erlang has a default limit of 1024 Erlang ports, where some internal
+components uses one Erlang port (the ICU driver, Javascript
+evaluation). You seem to have exceeded this. You can change it at
+runtime using the ``ERL_MAX_PORTS`` env variable.
function raised exception (Cannot encode 'undefined' value as JSON)
-------------------------------------------------------------------
diff --git a/src/maintenance/performance.rst b/src/maintenance/performance.rst
index defec5e..776d213 100644
--- a/src/maintenance/performance.rst
+++ b/src/maintenance/performance.rst
@@ -99,13 +99,6 @@ will be continuously replicating.
Erlang
------
-Even if you've increased the maximum connections CouchDB will allow,
-the Erlang runtime system will not allow more than 1024 connections by
-default. Adding the following directive to ``(prefix)/etc/default/couchdb`` (or
-equivalent) will increase this limit (in this case to 4096)::
-
- export ERL_MAX_PORTS=4096
-
CouchDB versions up to 1.1.x also create Erlang Term Storage (`ETS`_) tables for
each replication. If you are using a version of CouchDB older than 1.2 and
must support many replications, also set the ``ERL_MAX_ETS_TABLES`` variable.