yes we can create a webservice in java which would be called by .net to display these counters.
But since the java code to read these counters needs use hadoop APIs ( job client ) , am not sure we can create a webservice to read the counters Question is how does the default hadoop task tracker display counter information in JSP pages ? does it read from the XML files ? thanks, On Thu, Feb 4, 2010 at 5:08 PM, Jeff Zhang <[email protected]> wrote: > I think you can create web service using Java, and then in .net using the > web service to display the result. > > > On Thu, Feb 4, 2010 at 7:21 PM, Jeff Zhang <[email protected]> wrote: > > > Do you mean want to connect the JobTracker using .Net ? If so, I'm afraid > I > > have no idea how to this. The rpc of hadoop is language dependent. > > > > > > > > > > On Thu, Feb 4, 2010 at 7:18 PM, Mark N <[email protected]> wrote: > > > >> could you please elaborate on this ( * hint to get started as am very > >> new > >> to hadoop? ) > >> So far I could succesfully read all the default and custom counters. > >> > >> Currently we are having a .net client. > >> > >> thanks in advance. > >> > >> > >> On Thu, Feb 4, 2010 at 4:53 PM, Jeff Zhang <[email protected]> wrote: > >> > >> > Well, you can create a proxy of JobTracker in client side, and then > you > >> can > >> > use the API of JobTracker to get the information of jobs. The Proxy > take > >> > the > >> > responsibility of communication with the Master Node. Read the > source > >> > code > >> > of JobClient can help you. > >> > > >> > > >> > On Thu, Feb 4, 2010 at 6:59 PM, Mark N <[email protected]> wrote: > >> > > >> > > Ye currently am using jobclient to read these counters. > >> > > > >> > > But We are not able to use *webservices *because the jar which is > used > >> to > >> > > read the counters from running hadoop job is itself a Hadoop > program > >> > > > >> > > If we could have pure Java Api which is run without hadoop command > >> then > >> > we > >> > > could return the counter variable into webservices and show in UI. > >> > > > >> > > Any help or technique to show thsese counters in the UI would be > >> > > appreciated ( not necessarily using web service ) > >> > > > >> > > > >> > > I am using webservices because I am having .net VB client > >> > > > >> > > thanks > >> > > > >> > > > >> > > > >> > > On Wed, Feb 3, 2010 at 8:33 PM, Jeff Zhang <[email protected]> > wrote: > >> > > > >> > > > I think you can use JobClient to get the counters in your web > >> service. > >> > > > If you look at the shell script bin/hadoop, you will find that > >> actually > >> > > > this > >> > > > shell use the JobClient to get the counters. > >> > > > > >> > > > > >> > > > > >> > > > On Wed, Feb 3, 2010 at 4:34 AM, Mark N <[email protected]> > >> wrote: > >> > > > > >> > > > > We have a hadoop job running and have used custom counters to > >> track > >> > > few > >> > > > > counters ( like no of successfully processed documents matching > >> > certain > >> > > > > conditions) > >> > > > > > >> > > > > > >> > > > > Since we need to get this counters even while the Hadoop job is > >> > running > >> > > , > >> > > > > we > >> > > > > wrote another Java program to read these counters > >> > > > > > >> > > > > > >> > > > > *Counter reader program *will do the following : > >> > > > > > >> > > > > > >> > > > > 1) List all the running jobs. > >> > > > > > >> > > > > 2) Get the running job using Job name > >> > > > > > >> > > > > 2) Get all the counter for individual running jobs > >> > > > > > >> > > > > 3) Set this counters in variables. > >> > > > > We could successfully read these counters , but since we > >> need > >> > > to > >> > > > > show these counters to custom UI , how can we show these > counters? > >> > > > > > >> > > > > we looked into various options to read these counters to > >> show > >> > in > >> > > > UI > >> > > > > as following : > >> > > > > > >> > > > > 1. Dump these counters to database , however this may be > >> > overhead > >> > > > > 2. Write web service and UI will invoke the functions > from > >> > these > >> > > > > service to show in UI ( However since we need to run "*Counter > >> reader > >> > > > > program " *with Hadoop command it might not be feasible to > write > >> web > >> > > > > service ? ) > >> > > > > > >> > > > > so the question is can we achive to read the counters using > >> > simple > >> > > > > Java APIs ? Does anyone have idea how does the default > jobtracker > >> JSP > >> > > > works > >> > > > > ? we wanted to built something similar to this > >> > > > > > >> > > > > thanks > >> > > > > > >> > > > > > >> > > > > > >> > > > > -- > >> > > > > Nipen Mark > >> > > > > > >> > > > > >> > > > > >> > > > > >> > > > -- > >> > > > Best Regards > >> > > > > >> > > > Jeff Zhang > >> > > > > >> > > > >> > > > >> > > > >> > > -- > >> > > Nipen Mark > >> > > > >> > > >> > > >> > > >> > -- > >> > Best Regards > >> > > >> > Jeff Zhang > >> > > >> > >> > >> > >> -- > >> Nipen Mark > >> > > > > > > > > -- > > Best Regards > > > > Jeff Zhang > > > > > > -- > Best Regards > > Jeff Zhang > -- Nipen Mark
