Hi Tom, As you suggested, I have created a copy of my proposal at [1] and shared with comment permissions. It will be a great help if you can review it sooner and provide a kind feedback.
Thank you! [1] https://docs.google.com/document/d/1bnFEVViCwMACHJRB1OiYZ-GAywCNJRxrUJPpHttpgpE/edit?usp=sharing Kind Regards, *Imesha Sudasingha* Undergraduate of Department of Computer Science and Engineering, University of Moratuwa, Sri Lanka. <https://lk.linkedin.com/in/imeshasudasingha> <https://github.com/IMS94> <http://stackoverflow.com/users/4012073/imesha-sudasingha> <https://twitter.com/Imesha94> On 28 March 2017 at 01:13, Tom Barber <[email protected]> wrote: > Hi Imesha > > I'm trying to figure out if/how I can get access to it on the dashboard. In > the mean time if you want to pastebin it, chuck it in a word doc, or > something completely different I'd be happy to take a look. > > Tom > > On Sun, Mar 26, 2017 at 3:09 PM, Imesha Sudasingha < > [email protected]> > wrote: > > > Hi Tom, > > > > Did you get a chance to look at my proposal? > > > > Kind Regards, > > *Imesha Sudasingha* > > Undergraduate of Department of Computer Science and Engineering, > > University of Moratuwa, > > Sri Lanka. > > > > <https://lk.linkedin.com/in/imeshasudasingha> <https://github.com/IMS94 > > > > <http://stackoverflow.com/users/4012073/imesha-sudasingha> > > <https://twitter.com/Imesha94> > > > > On 23 March 2017 at 10:40, Imesha Sudasingha <[email protected]> > > wrote: > > > > > Hi Tom, > > > > > > I have written a draft proposal and shared it with the Apache Software > > > Foundation through the GSoC dashboard. If you get a chance, can you > > please > > > review it and let me know what are the improvements required to be > made. > > > > > > Thanks in advance! > > > > > > Kind Regards, > > > *Imesha Sudasingha* > > > Undergraduate of Department of Computer Science and Engineering, > > > University of Moratuwa, > > > Sri Lanka. > > > > > > <https://lk.linkedin.com/in/imeshasudasingha> < > https://github.com/IMS94 > > > > > > <http://stackoverflow.com/users/4012073/imesha-sudasingha> > > > <https://twitter.com/Imesha94> > > > > > > On 22 March 2017 at 14:36, Imesha Sudasingha <[email protected]> > > > wrote: > > > > > >> Hi Tom, > > >> > > >> I think I had missed your point previously. I was referring to just > > >> storing the configuration of different components in different ZNodes > > and > > >> querying them later. Then I understood that we also need to have > > >> inheritance at zookeeper level in order to make it easy to configure > > OODT > > >> clusters as you have mentioned in the issue [1]. To configure clusters > > of > > >> OODT components with minimum configuration, I will have to review my > > design > > >> again and make a lot of improvements. For example, I have to think > > about a > > >> way to store configuration in zookeeper with minimum duplications and > > give > > >> components enough flexibility to initialize with no or minimum manual > > >> configuration. > > >> > > >> Since I have to submit the GSoC proposal before 3rd of April, I think > > >> that I won't have enough time to review the design and make the > > necessary > > >> improvements before that. Will that negatively affect the possibility > > of me > > >> being able to work on this project for GSoC 2017? Please let me know > you > > >> opinion. > > >> > > >> Thank you! > > >> > > >> [1] https://issues.apache.org/jira/browse/OODT-945 > > >> > > >> Kind Regards, > > >> *Imesha Sudasingha* > > >> Undergraduate of Department of Computer Science and Engineering, > > >> University of Moratuwa, > > >> Sri Lanka. > > >> > > >> <https://lk.linkedin.com/in/imeshasudasingha> < > > https://github.com/IMS94> > > >> <http://stackoverflow.com/users/4012073/imesha-sudasingha> > > >> <https://twitter.com/Imesha94> > > >> > > >> On 21 March 2017 at 10:52, Imesha Sudasingha <[email protected] > > > > >> wrote: > > >> > > >>> Hi Tom, > > >>> > > >>> Sorry for the late reply. Zookeeper is just providing an ZNode > > >>> structure, which can be considered as a tree where a node is accessed > > as > > >>> directories. For example, in [1] the file manager properties of the > > >>> instance with name "*node1*" is stored at the ZPath (Path to that > > >>> ZNode) "*/oodt/node1/file-mgr/filemgr.properties*". > > >>> > > >>> Therefore, my idea is that we can make such directories (ZPaths) per > > >>> each instance in our cluster (ex: */oodt/node1 for instance "node1"*, > > */oodt/node2 > > >>> for instance "node2"* and so on). Then inside each such path > (assigned > > >>> per node), we will have separate ZNodes for each component. For > > example, in > > >>> */oodt/node1* we will have an ZNode /oodt/node1/file-mgr which stores > > >>> the configurations of file manager of node1. Similarly, an ZNode > > >>> /oodt/node1/res-mgr will store the configuration of the resource > > manager of > > >>> node1. > > >>> > > >>> Hope you got the idea. Since zookeeper is not some kind of a graph > > >>> database, I couldn't think of a method to keep inheritance among > > >>> configuration at Zookeeper's side. However, the design I suggest will > > store > > >>> the configuration independently and will allow the users/developers > to > > >>> query those configuration. Therefore in my opinion, we should let the > > >>> developer to compare the configuration and make decisions. This way, > > we can > > >>> allow this distributed configuration manager to manage configuration > > of any > > >>> current component or any upcoming component making it more > extend-able. > > >>> > > >>> Can you let me know what do you think of it? > > >>> > > >>> Thank you! > > >>> > > >>> [1] https://drive.google.com/open?id=0B415Bnipaf1lNThKYXZMN3pFemc > > >>> > > >>> Kind Regards, > > >>> *Imesha Sudasingha* > > >>> Undergraduate of Department of Computer Science and Engineering, > > >>> University of Moratuwa, > > >>> Sri Lanka. > > >>> > > >>> <https://lk.linkedin.com/in/imeshasudasingha> > > >>> <https://github.com/IMS94> > > >>> <http://stackoverflow.com/users/4012073/imesha-sudasingha> > > >>> <https://twitter.com/Imesha94> > > >>> > > >>> On 20 March 2017 at 05:02, Tom Barber <[email protected]> > wrote: > > >>> > > >>>> Hi Imesha > > >>>> > > >>>> Sorry for the delay, I've been travelling and only just got myself > > >>>> through > > >>>> my backlog. > > >>>> > > >>>> The overall design looks good. I was also thinking it would make > sense > > >>>> if > > >>>> possible to have some form of inheritance in the config. So, for > > >>>> example, > > >>>> if you have 5 file managers, and they all share the same config > > except a > > >>>> base url or whatever, it would make sense to have a single set of > > >>>> configs > > >>>> and then individual overrides for configs that change. (My knowledge > > of > > >>>> Zookeeper isn't great, I'm assuming something along these lines is > > >>>> possible). > > >>>> > > >>>> It would also make sense, I think to register this stuff with the > > >>>> resource > > >>>> manager, but I'm not sure how that integration would work quite yet, > > so > > >>>> we'll need to figure that one out. > > >>>> > > >>>> Let me know if you have any questions about the above. > > >>>> > > >>>> Tom > > >>>> > > >>>> > > >>>> On Sat, Mar 18, 2017 at 12:39 PM, Imesha Sudasingha < > > >>>> [email protected] > > >>>> > wrote: > > >>>> > > >>>> > Hi Tom, > > >>>> > > > >>>> > What do you think of the design? Do you agree on implementing this > > >>>> > configuration management section in a separate module? > > >>>> > > > >>>> > I was thinking on starting on the implementation as a proof of > > >>>> concept. Can > > >>>> > you give me your kind feedback before I start on that? > > >>>> > > > >>>> > Thank you! > > >>>> > > > >>>> > Kind Regards, > > >>>> > *Imesha Sudasingha* > > >>>> > Undergraduate of Department of Computer Science and Engineering, > > >>>> > University of Moratuwa, > > >>>> > Sri Lanka. > > >>>> > > > >>>> > <https://lk.linkedin.com/in/imeshasudasingha> < > > >>>> https://github.com/IMS94> > > >>>> > <http://stackoverflow.com/users/4012073/imesha-sudasingha> > > >>>> > <https://twitter.com/Imesha94> > > >>>> > > > >>>> > On 16 March 2017 at 17:51, Imesha Sudasingha < > > [email protected] > > >>>> > > > >>>> > wrote: > > >>>> > > > >>>> > > Hi Tom, > > >>>> > > > > >>>> > > Thanks for the quick reply. I came up with a small design [1]. > > >>>> > > > > >>>> > > What I suggest is a separate module for configuration > management, > > >>>> which > > >>>> > > can be extended in future and used by many components as well. > > >>>> > > > > >>>> > > As shown in the design [1], File Manager (or any component that > is > > >>>> > willing > > >>>> > > to have this extended functionality of distributed configuration > > >>>> > > management) will have an instance of *ConfigurationManager* > which > > >>>> is an > > >>>> > > interface defined to load configuration (specifically, > .properties > > >>>> files) > > >>>> > > and get configurations of each running instance of the same > > >>>> component (If > > >>>> > > distributed configuration management is enabled, this will > return > > >>>> the > > >>>> > > configuration of all the other instances). > > >>>> > > > > >>>> > > There will be two implementing classes of that interface, > > >>>> > > *StandaloneConfigurationManager* and > > *DistributedConfigurationManag > > >>>> er.* > > >>>> > As > > >>>> > > the name implies, standalone configuration manager is to be used > > if > > >>>> the > > >>>> > > users do not intend to used distributed configuration > management. > > >>>> Also > > >>>> > this > > >>>> > > will be same as the current mechanism of configuration > management. > > >>>> Then > > >>>> > the > > >>>> > > distributed configuration manager will be the implementation > using > > >>>> > > Zookeeper. > > >>>> > > > > >>>> > > At zookeeper level, we will need to have a proper naming > mechanism > > >>>> and a > > >>>> > > structure to store configuration. For example,* > > >>>> > > /${nodeName}/${componentName}/{$configFileName}* will be the > > place > > >>>> where > > >>>> > > the configuration file contents will be stored. *getFile(String > > >>>> fileName) > > >>>> > > and getFiles(String directiryName)* of *NodeConfiguration* class > > >>>> will > > >>>> > > return the content of the configuration files and configuration > > >>>> > directories > > >>>> > > respectively. I have demonstrated the ZNode structre I'm > expecting > > >>>> to > > >>>> > > design in [2] > > >>>> > > > > >>>> > > Please note that this is just a very high level overview of my > > >>>> design and > > >>>> > > the real difficulty of implementation comes when testing this > and > > >>>> > > addressing the edge cases of zookeeper. Also, I have only added > > few > > >>>> > methods > > >>>> > > that came to my mind to the *ConfigurationManager* interface. If > > >>>> you find > > >>>> > > any fault in this design or have a better design in mind please > > let > > >>>> me > > >>>> > know > > >>>> > > so that I can optimize this design and do my best to come up > with > > >>>> the > > >>>> > best > > >>>> > > possible solution. > > >>>> > > > > >>>> > > Thank you! > > >>>> > > > > >>>> > > [1] https://drive.google.com/open?id= > 0B415Bnipaf1ldnV1dWt4VVVLam8 > > >>>> > > [2] https://drive.google.com/open?id= > 0B415Bnipaf1lNThKYXZMN3pFemc > > >>>> > > > > >>>> > > Kind Regards, > > >>>> > > *Imesha Sudasingha* > > >>>> > > Undergraduate of Department of Computer Science and > Engineering, > > >>>> > > University of Moratuwa, > > >>>> > > Sri Lanka. > > >>>> > > > > >>>> > > <https://lk.linkedin.com/in/imeshasudasingha> < > > >>>> https://github.com/IMS94 > > >>>> > > > > >>>> > > <http://stackoverflow.com/users/4012073/imesha-sudasingha> > > >>>> > > <https://twitter.com/Imesha94> > > >>>> > > > > >>>> > > On 16 March 2017 at 16:55, Tom Barber <[email protected]> > > >>>> wrote: > > >>>> > > > > >>>> > >> Hi Imesha, > > >>>> > >> > > >>>> > >> Basically, just allowing the dynamic registration of file > > managers > > >>>> so > > >>>> > that > > >>>> > >> new ones can come and go. > > >>>> > >> > > >>>> > >> Tom > > >>>> > >> > > >>>> > >> On Thu, Mar 16, 2017 at 10:00 AM, Imesha Sudasingha < > > >>>> > >> [email protected] > > >>>> > >> > wrote: > > >>>> > >> > > >>>> > >> > Hi Tom, > > >>>> > >> > > > >>>> > >> > Need a small clarification. In the last reply, you mentioned > > >>>> that file > > >>>> > >> > managers may be designed to be *transient. *What do you mean > by > > >>>> that? > > >>>> > A > > >>>> > >> > quick response would really help me as I'm trying to come up > > >>>> with a > > >>>> > >> design. > > >>>> > >> > > > >>>> > >> > Thank you! > > >>>> > >> > > > >>>> > >> > *Imesha Sudasingha* > > >>>> > >> > Undergraduate of Department of Computer Science and > > Engineering, > > >>>> > >> > University of Moratuwa, > > >>>> > >> > Sri Lanka. > > >>>> > >> > > > >>>> > >> > <https://lk.linkedin.com/in/imeshasudasingha> < > > >>>> > >> https://github.com/IMS94> > > >>>> > >> > <http://stackoverflow.com/users/4012073/imesha-sudasingha> > > >>>> > >> > <https://twitter.com/Imesha94> > > >>>> > >> > > > >>>> > >> > On 13 March 2017 at 22:03, Imesha Sudasingha < > > >>>> [email protected] > > >>>> > > > > >>>> > >> > wrote: > > >>>> > >> > > > >>>> > >> > > Hi Tom, > > >>>> > >> > > > > >>>> > >> > > Thanks for the clarification. It really helped a lot to > fill > > >>>> most of > > >>>> > >> the > > >>>> > >> > > gaps I had unanswered. I have a draft design in my mind and > > >>>> will > > >>>> > post > > >>>> > >> for > > >>>> > >> > > your review with details soon. > > >>>> > >> > > > > >>>> > >> > > As for my current understanding, my task is to implement a > > >>>> mechanism > > >>>> > >> to > > >>>> > >> > > switch/chose configuration mechanism (between local files > and > > >>>> > zookeer > > >>>> > >> for > > >>>> > >> > > the moment) and then allow APIs to query those mechanisms > (in > > >>>> the > > >>>> > >> > zookeeper > > >>>> > >> > > scenario) for future use (For File Managers to know about > > other > > >>>> > >> instances > > >>>> > >> > > and make decisions accordingly). That include > > synchronization, > > >>>> > >> fetching > > >>>> > >> > > configuration from zookeeper if an instance go down and > come > > >>>> again > > >>>> > >> and so > > >>>> > >> > > on. Am I correct? > > >>>> > >> > > > > >>>> > >> > > I will try to come up with the design I mentioned, so that > > >>>> both of > > >>>> > us > > >>>> > >> can > > >>>> > >> > > discuss more about the improvements and requirements soon. > > >>>> > >> > > > > >>>> > >> > > Thank you for the support! > > >>>> > >> > > > > >>>> > >> > > Kind Regards, > > >>>> > >> > > *Imesha Sudasingha* > > >>>> > >> > > Undergraduate of Department of Computer Science and > > >>>> Engineering, > > >>>> > >> > > University of Moratuwa, > > >>>> > >> > > Sri Lanka. > > >>>> > >> > > > > >>>> > >> > > <https://lk.linkedin.com/in/imeshasudasingha> < > > >>>> > >> https://github.com/IMS94 > > >>>> > >> > > > > >>>> > >> > > <http://stackoverflow.com/users/4012073/imesha-sudasingha> > > >>>> > >> > > <https://twitter.com/Imesha94> > > >>>> > >> > > > > >>>> > >> > > On 13 March 2017 at 20:19, Tom Barber < > > [email protected] > > >>>> > > > >>>> > >> wrote: > > >>>> > >> > > > > >>>> > >> > >> Hi Imesha > > >>>> > >> > >> > > >>>> > >> > >> The best way to demonstrate this is to show you a > reference > > >>>> build > > >>>> > for > > >>>> > >> > >> OODT.. > > >>>> > >> > >> > > >>>> > >> > >> https://dl.dropboxusercontent. > > com/u/8503756/oodt-example.tgz > > >>>> > >> > >> > > >>>> > >> > >> If you can grab that archive and extract it, you'll see > that > > >>>> is how > > >>>> > >> > >> currently OODT is deployed. > > >>>> > >> > >> > > >>>> > >> > >> If you take the file manager as the reference module > inside > > >>>> > >> oodt/filemgr > > >>>> > >> > >> you'll see > > >>>> > >> > >> > > >>>> > >> > >> etc/filemgr.properties > > >>>> > >> > >> > > >>>> > >> > >> and > > >>>> > >> > >> > > >>>> > >> > >> policy/oodt/* > > >>>> > >> > >> > > >>>> > >> > >> These are the configuration locations of a single file > > >>>> manager. > > >>>> > >> > >> > > >>>> > >> > >> The problem I want to solve is this: > > >>>> > >> > >> > > >>>> > >> > >> a) If I run > 1 file manager they are completely separate > > and > > >>>> they > > >>>> > >> don't > > >>>> > >> > >> know of each other. So using Zookeeper will allow multiple > > >>>> file > > >>>> > >> managers > > >>>> > >> > >> to > > >>>> > >> > >> register against ZK and learn of each other. > > >>>> > >> > >> > > >>>> > >> > >> b) Backing them onto ZK will allow file managers to come > and > > >>>> go on > > >>>> > >> the > > >>>> > >> > >> fly, > > >>>> > >> > >> providing scaling capabilities or maybe fm's that are > > >>>> designed to > > >>>> > be > > >>>> > >> > >> transient. > > >>>> > >> > >> > > >>>> > >> > >> Just for clarity, the ZK configuration will be an optional > > >>>> > >> requirement, > > >>>> > >> > so > > >>>> > >> > >> we need to extend the existing configuration mechanism, to > > >>>> support > > >>>> > >> both > > >>>> > >> > >> the > > >>>> > >> > >> current config and the ZK config instead of ZK being > > >>>> mandatory. > > >>>> > >> > >> > > >>>> > >> > >> Tom > > >>>> > >> > >> > > >>>> > >> > >> On Mon, Mar 13, 2017 at 3:20 AM, Imesha Sudasingha < > > >>>> > >> > >> [email protected]> > > >>>> > >> > >> wrote: > > >>>> > >> > >> > > >>>> > >> > >> > Hi Tom, > > >>>> > >> > >> > > > >>>> > >> > >> > Related to the conversation on JIRA [1] ; > > >>>> > >> > >> > > > >>>> > >> > >> > I went through the CAS-File manager module and I now > > >>>> understand > > >>>> > >> how to > > >>>> > >> > >> > address ".properties" files. Since you mentioned in JIRA > > >>>> [2] that > > >>>> > >> > there > > >>>> > >> > >> are > > >>>> > >> > >> > occasions where we use *spring configuration files *for > > >>>> > >> configuration > > >>>> > >> > >> > purposes, I want to have a look at that type of > > >>>> configuration > > >>>> > too. > > >>>> > >> Can > > >>>> > >> > >> you > > >>>> > >> > >> > give me an example module where spring configuration > files > > >>>> are > > >>>> > >> used to > > >>>> > >> > >> load > > >>>> > >> > >> > configuration? > > >>>> > >> > >> > > > >>>> > >> > >> > Also, will the content of a configuration file exceed > 1MB > > >>>> > (Maximum > > >>>> > >> > data > > >>>> > >> > >> > size allowed in an ZNode) in any case? > > >>>> > >> > >> > > > >>>> > >> > >> > Thank you! > > >>>> > >> > >> > > > >>>> > >> > >> > [1] > > >>>> > >> > >> > https://issues.apache.org/jira > > >>>> /browse/OODT-945?focusedCommen > > >>>> > >> > >> tId=15906204& > > >>>> > >> > >> > page=com.atlassian.jira.plugin.system.issuetabpanels: > > >>>> > >> > >> > comment-tabpanel#comment-15906204 > > >>>> > >> > >> > > > >>>> > >> > >> > [2] > > >>>> > >> > >> > https://issues.apache.org/jira > > >>>> /browse/OODT-945?focusedCommen > > >>>> > >> > >> tId=15906524& > > >>>> > >> > >> > page=com.atlassian.jira.plugin.system.issuetabpanels: > > >>>> > >> > >> > comment-tabpanel#comment-15906524 > > >>>> > >> > >> > > > >>>> > >> > >> > Kind Regards, > > >>>> > >> > >> > *Imesha Sudasingha* > > >>>> > >> > >> > Undergraduate of Department of Computer Science and > > >>>> Engineering, > > >>>> > >> > >> > University of Moratuwa, > > >>>> > >> > >> > Sri Lanka. > > >>>> > >> > >> > > > >>>> > >> > >> > <https://lk.linkedin.com/in/imeshasudasingha> < > > >>>> > >> > >> https://github.com/IMS94> > > >>>> > >> > >> > <http://stackoverflow.com/users/4012073/imesha- > sudasingha > > > > > >>>> > >> > >> > <https://twitter.com/Imesha94> > > >>>> > >> > >> > > > >>>> > >> > >> > > >>>> > >> > > > > >>>> > >> > > > > >>>> > >> > > > >>>> > >> > > >>>> > > > > >>>> > > > > >>>> > > > >>>> > > >>> > > >>> > > >> > > > > > >
