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https://issues.apache.org/jira/browse/COUCHDB-3284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15843544#comment-15843544
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ASF GitHub Bot commented on COUCHDB-3284:
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GitHub user nickva opened a pull request:
https://github.com/apache/couchdb-couch/pull/223
Remove 8kB read-ahead from couch_file
In production it showed an increased input Erlang IO and increased binary
memory usage.
See attached file in Jira ticket:
COUCHDB-3284
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloudant/couchdb-couch couchdb-3284
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/couchdb-couch/pull/223.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #223
----
commit d52a5335d930d11ade4953c8576d22f55872ff6f
Author: Nick Vatamaniuc <[email protected]>
Date: 2017-01-27T17:04:01Z
Remove 8kB read-ahead from couch_file
In production it showed an increased input Erlang IO and increased binary
memory usage.
See attached file in Jira ticket:
COUCHDB-3284
----
> 8Kb read-ahead in couch_file causes extra IO and binary memory usage
> --------------------------------------------------------------------
>
> Key: COUCHDB-3284
> URL: https://issues.apache.org/jira/browse/COUCHDB-3284
> Project: CouchDB
> Issue Type: Bug
> Components: Database Core
> Affects Versions: 2.0.0
> Reporter: Nick Vatamaniuc
> Attachments: jira_io_increased.png
>
>
> 8Kb read-ahead logic in couch_file seems to cause extra input IO thrashing,
> binary memory usage but doesn't speed-up
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