[GitHub] couchdb-couch pull request #223: Remove 8kB read-ahead from couch_file

2017-01-27 Thread nickva 
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 
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




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[jira] [Commented] (COUCHDB-3284) 8Kb read-ahead in couch_file causes extra IO and binary memory usage

2017-01-27 Thread ASF GitHub Bot (JIRA) 

[ 
https://issues.apache.org/jira/browse/COUCHDB-3284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15843544#comment-15843544
 ] 

ASF GitHub Bot commented on COUCHDB-3284:
-

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 
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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[jira] [Commented] (COUCHDB-3284) 8Kb read-ahead in couch_file causes extra IO and binary memory usage

2017-01-27 Thread Nick Vatamaniuc (JIRA) 

[ 
https://issues.apache.org/jira/browse/COUCHDB-3284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15843539#comment-15843539
 ] 

Nick Vatamaniuc commented on COUCHDB-3284:
--

Attached performance graphs showing increased IO usage and increased binary 
memory usage. Those go away after disabling 8kb read-ahead logic

> 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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[jira] [Created] (COUCHDB-3284) 8Kb read-ahead in couch_file causes extra IO and binary memory usage

2017-01-27 Thread Nick Vatamaniuc (JIRA) 
Nick Vatamaniuc created COUCHDB-3284:


 Summary: 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
Reporter: Nick Vatamaniuc






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[jira] [Commented] (COUCHDB-3013) Empty selector and empty $and selector not returning same results

2017-01-27 Thread David Squier (JIRA) 

[ 
https://issues.apache.org/jira/browse/COUCHDB-3013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15843376#comment-15843376
 ] 

David Squier commented on COUCHDB-3013:
---

I believe we're also now hitting this issue with CouchDB 2.0.

If there is additional information we can provide (i.e., test case), let me 
know and I'll be happy to help.



> Empty selector and empty $and selector not returning same results
> -
>
> Key: COUCHDB-3013
> URL: https://issues.apache.org/jira/browse/COUCHDB-3013
> Project: CouchDB
>  Issue Type: Bug
>  Components: Mango
>Reporter: Garren Smith
>
> If I do `selector: {}` I get all the docs returned.
> But if I do `selector: {$and: [{}, {}]}` I get 0 docs returned.
> I think these queries are the same and should return all docs.



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[GitHub] couchdb-documentation pull request #99: Fix documentation contribution guide...

2017-01-27 Thread satabin 
GitHub user satabin opened a pull request:

https://github.com/apache/couchdb-documentation/pull/99

Fix documentation contribution guidelines

The documentation site now lives in its own git repository. The
guidelines are outdated.

You can merge this pull request into a Git repository by running:

$ git pull https://github.com/satabin/couchdb-documentation 
update-contribution-guidelines

Alternatively you can review and apply these changes as the patch at:

https://github.com/apache/couchdb-documentation/pull/99.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 #99


commit e7725f92d78b3e325be725022945c2dc3958f17e
Author: Lucas Satabin 
Date:   2017-01-27T16:30:11Z

Fix documentation contribution guidelines

The documentation site now lives in its own git repository. The
guidelines are outdated.




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