[openstack-dev] [TripleO] prep-source-repos - new tool for managing repos+patchsets?

2014-10-09 Thread James Polley
I've got a new tool, currently called prep-source-repos, that I'd like to set up as a new project. Most of the work was done by adamg and lifeless, with a bit of polish from me to make it ready to be packaged. The tool is something the tripleo-cd-admins have been using to let us deploy a cloud fro

Re: [openstack-dev] TC Candidacy

2014-10-09 Thread Anita Kuno
confirmed On 10/10/2014 01:52 AM, David Lyle wrote: > I would like to announce my candidacy for the Technical Committee. > > I have been working on OpenStack since the beginning of the Grizzly cycle. > I started working on OpenStack as part of HP's Public Cloud effort. I spent > two years working

[openstack-dev] [Fuel] Generic descriptive format for deployment tasks

2014-10-09 Thread Dmitriy Shulyak
Hi team, After several discussions i want to propose generic format for describing deployment tasks, this format is expected to cover all tasks (e.g pre-deployment and post-deployment), also it should cover different actions like upgrade/patching action: upload_file id: upload_astute roles: * para

Re: [openstack-dev] [api] Forming the API Working Group

2014-10-09 Thread Christopher Yeoh
Hi Everett, Great to see things moving with the API Working Group! On Thu, Oct 9, 2014 at 9:35 AM, Everett Toews wrote: > https://wiki.openstack.org/wiki/API_Working_Group > > This is the start of the API Working Group (API WG). > > To avoid bike shedding over the name of the working group, I d

Re: [openstack-dev] TC Candidacy

2014-10-09 Thread Anita Kuno
confirmed On 10/10/2014 01:22 AM, John Griffith wrote: > I'd like to announce my candidacy for the OpenStack Technical Committee > Fall 2014 elections. > > I've been contributing to OpenStack for almost three years now (this months > my anniversary) and up until this election cycle have served as

[openstack-dev] TC Candidacy

2014-10-09 Thread David Lyle
I would like to announce my candidacy for the Technical Committee. I have been working on OpenStack since the beginning of the Grizzly cycle. I started working on OpenStack as part of HP's Public Cloud effort. I spent two years working to make Horizon work in that scale of environment and making H

[openstack-dev] TC Candidacy

2014-10-09 Thread John Griffith
I'd like to announce my candidacy for the OpenStack Technical Committee Fall 2014 elections. I've been contributing to OpenStack for almost three years now (this months my anniversary) and up until this election cycle have served as PTL for the Cinder Project. Over the years I've had the opportun

[openstack-dev] [swift] Allow hostname for nodes in Ring

2014-10-09 Thread Osanai, Hisashi
Hi Swift folks, Today the following patch was abandoned and I contacted with the author, so I would like to take it over if nobody else is chafing to take it. Is it OK? https://review.openstack.org/#/c/80421/ If it is OK, I will proceed it with following procedure. (1) Open new bug report (the

Re: [openstack-dev] [all] [tc] Multi-clouds integration by OpenStack cascading

2014-10-09 Thread joehuang
Hello, Duncan, You are right. It's not simple multiplier game. The performance or scalability bottleneck is mainly impacted from two aspect: request concurrency to the cloud, and the volume of the objects (including VM,Volume,Port,etc). We can discuss that in a scenario: there are 1 million V

Re: [openstack-dev] [neutron] Creation of neutron-drivers team

2014-10-09 Thread Damon Wang
Hope this can accelerate Neutron's development :-) Regards, Damon 2014-10-09 5:46 GMT+08:00 Kyle Mestery : > Sure, I'll add that section there. > > On Tue, Oct 7, 2014 at 2:58 PM, Kevin Benton wrote: > > Can you add a section to the wiki to document how a core can become a > member > > of the d

Re: [openstack-dev] [keystone] Using 'admin_token' option as token to create keystone client.

2014-10-09 Thread Lei Zhang
Yes. That will be more safer. On Fri, Oct 10, 2014 at 12:00 AM, Nader Lahouti wrote: > Thanks Lei for the reply and clarification. > So, instead of that we can use the following: > > > from keystone client.v2_0 import Client > > keystone = Client(username=user, password=password, tenant_name=tena

Re: [openstack-dev] [TripleO] Kilo Mid-Cycle Meetup Planning

2014-10-09 Thread James Polley
> On 10 Oct 2014, at 07:32, Gregory Haynes wrote: > > Hello TripleO-ers, > > Last time around there was a lot of feedback that we should plan our > mid-cycle metup a lot sooner, so lets do that! I've created a (mostly > bare) etherpad here: > > https://etherpad.openstack.org/p/kilo-tripleo-

Re: [openstack-dev] [openstack-qa] Post job failures

2014-10-09 Thread Joe Gordon
What about using graphite + logstash to power a post-job /nightly-job/post-merge-periodic (the new thing we talked about in Germany) dashboard? There are a few different use cases for a dashboard for jobs that don't report on gerrit changes. * Track the success an failure rates over time * If I

Re: [openstack-dev] OpenStack Havana End of Upstream Support Lifetime

2014-10-09 Thread Chris Friesen
On 10/09/2014 02:39 PM, Jeremy Stanley wrote: On 2014-10-09 11:31:37 -0600 (-0600), Chris Friesen wrote: Just curious...why do we remove the stable branches for old releases? Is the idea to force people onto new branches? It's twofold. First, it's to indicate that the branch will be getting no

Re: [openstack-dev] [sahara] team meeting Oct 9 1800 UTC

2014-10-09 Thread Sergey Lukjanov
Meeting minutes: http://eavesdrop.openstack.org/meetings/sahara/2014/sahara.2014-10-09-18.02.html On Wed, Oct 8, 2014 at 10:59 AM, Sergey Lukjanov wrote: > Hi folks, > > We'll be having the Sahara team meeting as usual in > #openstack-meeting-alt channel. > > Agenda: > https://wiki.openstack.org

Re: [openstack-dev] Can sqlalchemy-migrate-core just be oslo.db core?

2014-10-09 Thread Doug Hellmann
On Oct 9, 2014, at 4:30 PM, Matt Riedemann wrote: > The sqlalchemy-migrate project is basically maintenance mode and the core > team [1] is kind of a weird mix of people - all great people I'm sure, but I > think it's more a team of people that stepped up when OpenStack took over the > projec

Re: [openstack-dev] Can sqlalchemy-migrate-core just be oslo.db core?

2014-10-09 Thread Matt Riedemann
On 10/9/2014 3:30 PM, Matt Riedemann wrote: The sqlalchemy-migrate project is basically maintenance mode and the core team [1] is kind of a weird mix of people - all great people I'm sure, but I think it's more a team of people that stepped up when OpenStack took over the project and said they'

Re: [openstack-dev] OpenStack Havana End of Upstream Support Lifetime

2014-10-09 Thread Jeremy Stanley
On 2014-10-09 14:13:29 -0400 (-0400), Boden Russell wrote: > If I'm not mistaken; it appears the tag rename from "havana" -> > "havana-eol" may be effecting the upgrade CI tests in recent > commits (ex: [1]). > > For example in real-db-upgrade_nova_mysql_user001:th-mysql: [...] That's a third-par

Re: [openstack-dev] OpenStack Havana End of Upstream Support Lifetime

2014-10-09 Thread Jeremy Stanley
On 2014-10-09 11:31:37 -0600 (-0600), Chris Friesen wrote: > Just curious...why do we remove the stable branches for old > releases? Is the idea to force people onto new branches? It's twofold. First, it's to indicate that the branch will be getting no new patches ever. Second, it's because that's

[openstack-dev] [TripleO] Kilo Mid-Cycle Meetup Planning

2014-10-09 Thread Gregory Haynes
Hello TripleO-ers, Last time around there was a lot of feedback that we should plan our mid-cycle metup a lot sooner, so lets do that! I've created a (mostly bare) etherpad here: https://etherpad.openstack.org/p/kilo-tripleo-midcycle-meetup Note that there are currently no possible venues listed

[openstack-dev] Can sqlalchemy-migrate-core just be oslo.db core?

2014-10-09 Thread Matt Riedemann
The sqlalchemy-migrate project is basically maintenance mode and the core team [1] is kind of a weird mix of people - all great people I'm sure, but I think it's more a team of people that stepped up when OpenStack took over the project and said they'd babysit it but it's pretty idle. Given w

Re: [openstack-dev] [Fuel] Contribution to fuel-library: new requirements for reviews

2014-10-09 Thread Dmitry Borodaenko
Documented in the Wiki: https://wiki.openstack.org/wiki/Fuel/Code_Review_Rules#Merging_commits On Thu, Oct 9, 2014 at 1:19 AM, Mike Scherbakov wrote: > This discussion should go in the public, as not every developer is here, > and other opinions are important. > > I believe that we are again div

Re: [openstack-dev] [all] [oslo] Acceptable methods for establishing per-test-suite behaviors

2014-10-09 Thread Doug Hellmann
On Oct 8, 2014, at 10:14 AM, Doug Hellmann wrote: > > On Oct 8, 2014, at 1:22 AM, Robert Collins wrote: > >> On 8 October 2014 11:10, Mike Bayer wrote: >>> Hi folks - >>> >>> So just to update on the status here, for the transactional testing and all >>> that, I’ve had a blueprint in the q

Re: [openstack-dev] [Fuel] Documentation Process changed

2014-10-09 Thread Dmitry Borodaenko
Filtering bugs by tags works fine in advanced search, the only problem is that you can't combine it with filtering by releases (since that's broken in advanced search and you have to use milestone page for that). On Thu, Oct 9, 2014 at 12:18 PM, Dmitry Pyzhov wrote: > We definitely need to assig

Re: [openstack-dev] [all] [tc] Multi-clouds integration by OpenStack cascading

2014-10-09 Thread Duncan Thomas
On 9 October 2014 07:49, henry hly wrote: > Hi Joshua, > > ...in fact hierarchical scale > depends on square of single child scale. If a single child can deal > with 00's to 000's, cascading on it would then deal with 00,000's. That is faulty logic - maybe the cascading solution needs to deal wit

Re: [openstack-dev] [all] [tc] Multi-clouds integration by OpenStack cascading

2014-10-09 Thread Duncan Thomas
On 8 October 2014 10:32, joehuang wrote: > "maybe we should just slap a REST api on it". The challenge of Node-pool REST > API is "What it will look like for these API, totally new API? current OS-API > ?". From cloud operators' feed back, OS-API is preferred. If we developed > totally new API

Re: [openstack-dev] [all] [oslo] Proposed database connectivity patterns

2014-10-09 Thread Mike Bayer
So so far, everyone seems really positive and psyched about the proposal. It looks like providing some options for how to use would be best, that is provide decorators and context managers. Now the thing with the context manager, it can be as I stated: with sql.reader() as session: or

Re: [openstack-dev] [Keystone][Oslo] User mapping and X509 for signing

2014-10-09 Thread Adam Young
On 10/09/2014 09:31 AM, John Dennis wrote: On 10/08/2014 04:58 PM, Adam Young wrote: When gyee posted his X509 server-side auth plugin patch, the feedback we gave was that it should be using the mapping code from Federation to transform the environment variables set by the web server to the Key

Re: [openstack-dev] [Fuel] Documentation Process changed

2014-10-09 Thread Dmitry Pyzhov
We definitely need to assign these bugs to the fuel-docs team. And there is a good point from Alexandra Fedorova that commit message needs to have enough information for tech writer. And reviewers should not merge fixes that do not apply this rule. Otherwise we will end up with new bottlenecks. On

[openstack-dev] [Cinder] Juno RC2 available

2014-10-09 Thread Thierry Carrez
Hello everyone, Due to a number of issues discovered in the published Cinder 2014.2 RC1 (including two security issues), we generated a new Juno release candidate. You can find the list of bugfixes in this RC and a link to a source tarball at: https://launchpad.net/cinder/juno/juno-rc2 Unless ne

Re: [openstack-dev] OpenStack Havana End of Upstream Support Lifetime

2014-10-09 Thread Boden Russell
On 10/9/14 1:31 PM, Chris Friesen wrote: > On 10/09/2014 08:12 AM, Jeremy Stanley wrote: > > On 2014-09-30 01:38:29 + (+), Jeremy Stanley wrote: > > [...] > >> the tips of these branches have been tagged "havana-eol" in > >> preparation for branch deletion. The list of affected Git > >> re

[openstack-dev] [Ironic] Juno RC2 available

2014-10-09 Thread Devananda van der Veen
Hi all! We've had one release critical bug discovered in the past week, and so today an RC2 candidate was published. A tarball of that is available at: https://launchpad.net/ironic/+milestone/juno-rc2 This fixed the following bug: Hash ring is stale after new conductor added https://bugs.la

Re: [openstack-dev] OpenStack Technical Committee Nomination

2014-10-09 Thread Tristan Cacqueray
confirmed. Note that we are making an exception here for a brand new parent. I'd like to remind further candidate to use the proper "TC candidacy" mail subject. On 08/10/14 09:33 PM, Sean Dague wrote: > I'd like to announce throwing my hat into the ring for the OpenStack > Technical Committee. >

Re: [openstack-dev] OpenStack Technical Committee Nomination

2014-10-09 Thread Tristan Cacqueray
confirmed. Note that we are making an exception here for a brand new parent. I'd like to remind further candidate to use the proper "TC candidacy" mail subject. On 08/10/14 09:33 PM, Sean Dague wrote: > I'd like to announce throwing my hat into the ring for the OpenStack > Technical Committee. >

Re: [openstack-dev] [Fuel] Contribution to fuel-library: new requirements for reviews

2014-10-09 Thread Sergii Golovatiuk
Hi, I think it must be a mandatory request for fuel-library core reviewers. -- Best regards, Sergii Golovatiuk, Skype #golserge IRC #holser On Thu, Oct 9, 2014 at 10:19 AM, Mike Scherbakov wrote: > This discussion should go in the public, as not every developer is here, > and other opinions ar

Re: [openstack-dev] OpenStack Havana End of Upstream Support Lifetime

2014-10-09 Thread Chris Friesen
On 10/09/2014 08:12 AM, Jeremy Stanley wrote: On 2014-09-30 01:38:29 + (+), Jeremy Stanley wrote: [...] the tips of these branches have been tagged "havana-eol" in preparation for branch deletion. The list of affected Git repositories is as follows: openstack-dev/devstack open

Re: [openstack-dev] [Nova] object field naming question

2014-10-09 Thread Dan Smith
> The value it adds (and that an underscore would add in hvtype -> > hv_type) is that the name would match the naming style for the vast > majority of everything else in OpenStack. See, for examples: Agreed. > As mentioned in the review, I disagree on this point, since "doing a > cleanup afterwar

Re: [openstack-dev] [Neutron] Proposing to disallow updates of IPv6 attributes on subnets

2014-10-09 Thread Martinx - ジェームズ
Ah okay... That's seems to be perfect fine... Thank you! :-) On 9 October 2014 10:22, Robert Li (baoli) wrote: > Hi Thiago, > > A couple of things to consider: > — As it is now, it doesn’t seem to be fully functional if you change > your subnet to use SLAAC. The addresses that were assigne

Re: [openstack-dev] [Fuel] Cinder/Neutron plugins on UI

2014-10-09 Thread Dmitry Borodaenko
Notes from the architecture review meeting on plugins UX: - separate page for plugins management - user installs the plugin on the master - global master node configuration across all environments: - user can see a list of plugins on Plugins tab (plugins description) - Enable/

Re: [openstack-dev] [keystone] Using 'admin_token' option as token to create keystone client.

2014-10-09 Thread Nader Lahouti
Thanks Lei for the reply and clarification. So, instead of that we can use the following: from keystone client.v2_0 import Client keystone = Client(username=user, password=password, tenant_name=tenant, auth_url=url) with user, password, tenant and url can be obtained from cfg.CONF. Thanks,

Re: [openstack-dev] [Nova] object field naming question

2014-10-09 Thread Jay Pipes
On 10/09/2014 09:45 AM, Murray, Paul (HP Cloud) wrote: Hi All, The following question relates to this change: https://review.openstack.org/#/c/125091/ This change adds a field to the ComputeNode object called “supported_instances”. It also adds an object called “SupportedInstance” that has fie

Re: [openstack-dev] [Nova] object field naming question

2014-10-09 Thread Jay Pipes
On 10/09/2014 10:16 AM, Daniel P. Berrange wrote: On Thu, Oct 09, 2014 at 01:45:43PM +, Murray, Paul (HP Cloud) wrote: Hi All, The following question relates to this change: https://review.openstack.org/#/c/125091/ This change adds a field to the ComputeNode object called "supported_insta

Re: [openstack-dev] [Nova] object field naming question

2014-10-09 Thread Daniel P. Berrange
On Thu, Oct 09, 2014 at 01:45:43PM +, Murray, Paul (HP Cloud) wrote: > Hi All, > > The following question relates to this change: > > https://review.openstack.org/#/c/125091/ > > This change adds a field to the ComputeNode object called > "supported_instances". It also adds an object called

Re: [openstack-dev] OpenStack Havana End of Upstream Support Lifetime

2014-10-09 Thread Jeremy Stanley
On 2014-09-30 01:38:29 + (+), Jeremy Stanley wrote: [...] > the tips of these branches have been tagged "havana-eol" in > preparation for branch deletion. The list of affected Git > repositories is as follows: > > openstack-dev/devstack > openstack-dev/grenade > openstack/ceilo

Re: [openstack-dev] [nova] gerrit based statistics

2014-10-09 Thread Matt Riedemann
On 10/8/2014 9:21 PM, Joe Gordon wrote: On Wed, Oct 8, 2014 at 6:12 PM, Michael Still mailto:mi...@stillhq.com>> wrote: On Thu, Oct 9, 2014 at 11:58 AM, Joe Gordon mailto:joe.gord...@gmail.com>> wrote: > On Wed, Oct 8, 2014 at 4:30 PM, Joe Gordon mailto:joe.gord...@gmail.com>> wrote

[openstack-dev] [Nova] object field naming question

2014-10-09 Thread Murray, Paul (HP Cloud)
Hi All, The following question relates to this change: https://review.openstack.org/#/c/125091/ This change adds a field to the ComputeNode object called "supported_instances". It also adds an object called "SupportedInstance" that has fields called "arch", "hvtype" and "vm_mode". All these n

Re: [openstack-dev] [Fuel] Cinder/Neutron plugins on UI

2014-10-09 Thread Vitaly Kramskikh
Evgeniy, Yes, the plugin management page should be a separate page. As for dependency on releases, I meant that some plugin can work only on Ubuntu for example, so for different releases different plugins could be available. And please confirm that you also agree with the flow: the user install a

Re: [openstack-dev] [Keystone][Oslo] User mapping and X509 for signing

2014-10-09 Thread John Dennis
On 10/08/2014 04:58 PM, Adam Young wrote: > When gyee posted his X509 server-side auth plugin patch, the feedback > we gave was that it should be using the mapping code from Federation to > transform the environment variables set by the web server to the > Keystone userid, username, domain name

Re: [openstack-dev] [Neutron] Proposing to disallow updates of IPv6 attributes on subnets

2014-10-09 Thread Robert Li (baoli)
Hi Thiago, A couple of things to consider: ― As it is now, it doesn’t seem to be fully functional if you change your subnet to use SLAAC. The addresses that were assigned to your existing ports in neutron wouldn’t be updated/changed. So basically, you can not simply make an API call to change

Re: [openstack-dev] [Heat] Juno RC2 available

2014-10-09 Thread Martinx - ジェームズ
Congrats :-D On 9 October 2014 09:52, Thierry Carrez wrote: > Hello everyone, > > One week to final release! Due to a number of issues discovered in the > published Heat 2014.2 RC1, we generated a new Juno release candidate. > You can find the list of bugfixes in this RC and a link to a sou

Re: [openstack-dev] TC Candidacy

2014-10-09 Thread Tristan Cacqueray
confirmed On 09/10/14 09:07 AM, John Garbutt wrote: > Hi, > > I would like to run for a seat on the Technical Committee, to help > serve the whole OpenStack community during this time of change. > > I am employed by Rackspace, working on their public cloud. I am > currently focus mostly on Nova.

Re: [openstack-dev] [Fuel] Cinder/Neutron plugins on UI

2014-10-09 Thread Evgeniy L
Hi, Vitaly, I like the idea of having separate page, but I'm not sure if it should be on releases page. Usually a plugin is not release specific, usually it's environment specific and you can have different set of plugins for different environments. Also I don't think that we should enable plugin

[openstack-dev] TC Candidacy

2014-10-09 Thread John Garbutt
Hi, I would like to run for a seat on the Technical Committee, to help serve the whole OpenStack community during this time of change. I am employed by Rackspace, working on their public cloud. I am currently focus mostly on Nova. I am nova-core, and currently nova's blueprint czar. I am johnthet

Re: [openstack-dev] [nova] gerrit based statistics

2014-10-09 Thread Russell Bryant
On 10/08/2014 07:30 PM, Joe Gordon wrote: > Recently there has been a lot of discussion around the development > growing pains in nova. Instead of guessing about how bad some of the > issues are, I tried to answer a few questions that may help us better > understand the issues. > > > Q: How many

[openstack-dev] [Heat] Juno RC2 available

2014-10-09 Thread Thierry Carrez
Hello everyone, One week to final release! Due to a number of issues discovered in the published Heat 2014.2 RC1, we generated a new Juno release candidate. You can find the list of bugfixes in this RC and a link to a source tarball at: https://launchpad.net/heat/juno/juno-rc2 Unless new release

[openstack-dev] [compute][nova] Provide an option to ignore suspended VMs in the resource count

2014-10-09 Thread Arthur Lutz
Hi list, Here is proposal previously posted on https://bugs.launchpad.net/nova/+bug/1378233 It would be very useful for our case scenario to be able to have an option that enables not counting suspended machines as consuming resources. The use case is having little memory available and still bein

Re: [openstack-dev] ./run_tests.sh fails to create the .venv environment for neutron

2014-10-09 Thread Ihar Hrachyshka
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 On 09/10/14 01:55, Vasudevan, Swaminathan (PNB Roseville) wrote: > Hi Folks, > > > > ./run_tests.sh fails to create the .venv with the latest neutron > repo. > > It fails at MySQL-python. > > Does anyone know what is broken. You probably miss l

Re: [openstack-dev] [all][oslo][db][docs] RFC: drop support for libpq < 9.1

2014-10-09 Thread Ihar Hrachyshka
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 On 07/10/14 18:05, Mike Bayer wrote: > > On Oct 7, 2014, at 8:29 AM, Ihar Hrachyshka > wrote: > >> >> That said, I wonder how we're going to manage cases when those >> *global* settings for the whole server should be really limited >> to specifi

Re: [openstack-dev] [Fuel] Cinder/Neutron plugins on UI

2014-10-09 Thread Vitaly Kramskikh
Let me propose another approach. I agree with most of Dmitry's statements and it seems in MVP we need plugin management UI where we can enable installed plugins. It should be a separate page. If you want to create environment with a plugin, enable the plugin on this page and create a new environmen

[openstack-dev] [Nova] Questions on glance alternative link

2014-10-09 Thread Chen CH Ji
Hi in nova/api/openstack/compute/views/images.py, there is a function returns alternate links which contains project_id However, I didn't see any info in glance API V2 spec Can any one help me on : 1) what's the purpose of alternate link? can I remove the proje

Re: [openstack-dev] [nova] gerrit based statistics

2014-10-09 Thread Daniel P. Berrange
On Wed, Oct 08, 2014 at 04:30:16PM -0700, Joe Gordon wrote: > Recently there has been a lot of discussion around the development growing > pains in nova. Instead of guessing about how bad some of the issues are, I > tried to answer a few questions that may help us better understand the > issues. W

[openstack-dev] [Fuel] Contribution to fuel-library: new requirements for reviews

2014-10-09 Thread Mike Scherbakov
This discussion should go in the public, as not every developer is here, and other opinions are important. I believe that we are again diverting the conversation into a few directions. Let's address things one by one, and feel free to spin off new discussions out of this thread. After original ema

Re: [openstack-dev] [all] [oslo] Proposed database connectivity patterns

2014-10-09 Thread Roman Podoliaka
Hi Mike, Great stuff! Fixing the mess with transactions and their scope is probably one of the most important tasks for us, IMO. I look forward for this to be implemented in oslo.db and consuming projects! Thanks, Roman On Thu, Oct 9, 2014 at 12:07 AM, Mike Bayer wrote: > Hi all - > > I’ve draf

Re: [openstack-dev] [Zaqar] How to get the pool list in graceful way.

2014-10-09 Thread Flavio Percoco
On 10/09/2014 03:37 AM, Lei Zhang wrote: > The question comes from my patch[1]. Kgriffs point that there are two > way to get all the pools. But I don’t know which one is better, event > though I comment that limit=0 is wired. I think there are three ways. > > use limit=0( current logical). > pro: