nickva commented on code in PR #4627: URL: https://github.com/apache/couchdb/pull/4627#discussion_r1591574543
########## src/docs/src/config/quickjs.rst: ########## @@ -0,0 +1,122 @@ +.. Licensed under the Apache License, Version 2.0 (the "License"); you may not +.. use this file except in compliance with the License. You may obtain a copy of +.. the License at +.. +.. http://www.apache.org/licenses/LICENSE-2.0 +.. +.. Unless required by applicable law or agreed to in writing, software +.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT +.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the +.. License for the specific language governing permissions and limitations under +.. the License. + +.. default-domain:: config +.. highlight:: ini + +======= +QuickJS +======= + +Configure QuickJS Javascript Engine. + +QuickJS is an new Javascript Engine installed alongside the default +Spidermonkey engine. It's disabled by default, but may be enabled via +configuration settings. + +The configuration toggle to enable and disable QuickJS by default is in +:ref:`couchdb <config/couchdb>` ``js_engine`` section. + +To help evaluate design doc compatibility, without the penalty of resetting all +the views on a cluster, there is a :ref:`scanner <config/scanner>` plugin, +which will traverse databases and design docs, compile and then execute some of +the view functions using both engines and report incompatibilities. + +.. _config/quickjs: + +.. versionadded:: 3.4 + +QuickJS Options +=============== + +.. config:section:: quickjs :: QuickJS Engine Configuration + + .. config:option:: memory_limit_bytes + + Set QuickJS memory limit in bytes. The default is ``undefined`` and the + built-in C default of 64MB is used. :: + + [quickjs] + memory_limit_bytes = 67108864 + +.. config:section:: couch_quickjs_scanner_plugin :: QuickJS Scanner Plugin Settings + +Enable QuickJS Scanner plugin in :ref:`couch_scanner_plugins +<config/scanner>` ``couch_scanner_plugins`` section. + + .. config:option:: max_ddocs + + Limit the number of design docs processed per database. :: + + [couch_quickjs_scanner_plugin] + max_ddocs = 100 + + .. config:option:: max_shards + + Limit the number of shards processed per database. :: + + [couch_quickjs_scanner_plugin] + max_shards = 4 + + .. config:option:: max_docs + + Limit the number of documents processed per database. These are the max + number of documents sent to the design doc functions. :: + + [couch_quickjs_scanner_plugin] + max_docs = 1000 + + .. config:option:: max_step + + Limit the maximum step size when processing docs. Given that total + number of documents in a shard as N, if the max_docs is M, then the + step S = N / M. Then only every S documents will be sampled and + processed. :: + + [couch_quickjs_scanner_plugin] + max_step = 1000 + + .. config:option:: max_batch_items + + Maximum document batch size to gather before feeding them through each + design doc on both QuickJS and Spidermonkey engines and compare the + results. :: + + [couch_quickjs_scanner_plugin] + max_batch_items = 100 + + .. config:option:: max_batch_size + + Maximum memory usager for a document batch size. :: + + [couch_quickjs_scanner_plugin] + max_batch_size = 16777216 + + .. config:option:: after + + A common :ref:`scanner <config/scanner>` setting to + configure when to execute the plugin after it's enabled. By default + it's ``restart``, so the plugin would start running after a node + restart:: + + [couch_quickjs_scanner_plugin] + after = restart + + .. config:option:: repeat + + A common :ref:`scanner <config/scanner>` setting to + configure when to execute the plugin after it's enabled. By default + it's ``restart``, so the plugin would start running after a node + restart:: + + [couch_quickjs_scanner_plugin] + repeat = restart Review Comment: Np! Thank you for taking a look at the PR! -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
