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Posted to commits@couchdb.apache.org by rn...@apache.org on 2019/09/25 15:17:56 UTC
[couchdb-documentation] branch revert-erl_max_ports created (now
cb719c1)
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rnewson pushed a change to branch revert-erl_max_ports
in repository https://gitbox.apache.org/repos/asf/couchdb-documentation.git.
at cb719c1 Revert "Correct misleading commentary on ERL_MAX_PORTS"
This branch includes the following new commits:
new cb719c1 Revert "Correct misleading commentary on ERL_MAX_PORTS"
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[couchdb-documentation] 01/01: Revert "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 revert-erl_max_ports
in repository https://gitbox.apache.org/repos/asf/couchdb-documentation.git
commit cb719c1924e05423c2a9145329d2dd22cde02304
Author: Robert Newson <rn...@apache.org>
AuthorDate: Wed Sep 25 16:17:27 2019 +0100
Revert "Correct misleading commentary on ERL_MAX_PORTS"
This reverts commit f6b5f742f0f6d337b2c9895b3f42d8b05533a695.
I was wrong.
---
src/install/troubleshooting.rst | 7 +++----
src/maintenance/performance.rst | 7 +++++++
2 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/src/install/troubleshooting.rst b/src/install/troubleshooting.rst
index 36eb430..a2e9496 100644
--- a/src/install/troubleshooting.rst
+++ b/src/install/troubleshooting.rst
@@ -201,10 +201,9 @@ 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 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.
+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.
function raised exception (Cannot encode 'undefined' value as JSON)
-------------------------------------------------------------------
diff --git a/src/maintenance/performance.rst b/src/maintenance/performance.rst
index 776d213..defec5e 100644
--- a/src/maintenance/performance.rst
+++ b/src/maintenance/performance.rst
@@ -99,6 +99,13 @@ 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.