That actually sounds like a great idea. I discussed a bit with Robert offline on Friday, and it seems that Metrics has most of what we talked about.
I also like the way they make it extensible, so people can capture their own metrics. On Sun, Dec 7, 2014 at 6:02 AM, Henry Saputra <henry.sapu...@gmail.com> wrote: > Hi Robert, > > From I have seen it so far, it is probably better and easier for Flink > to leverage metrics library [1] for the metrics collection rather than > building organically. > > Several ASF projects like Spark [2] and Tajo have used it with great > success. > > One of the main reasons is maintainability and the breath of types of > metric could and should be collected. > > - Henry > > [1] https://dropwizard.github.io/metrics/3.1.0/getting-started/ > [2] https://spark.apache.org/docs/1.0.1/monitoring.html > [3] https://issues.apache.org/jira/browse/TAJO-333 > > On Sat, Dec 6, 2014 at 11:13 AM, Robert Metzger <rmetz...@apache.org> > wrote: > > Hey Nils, > > > > I have played around a bit with a little prototype. You can find the code > > here: https://github.com/rmetzger/incubator-flink/tree/flink456 (its > > another branch in my repo). > > You can see the changes that I applied on top of Till's Akka branch here: > > > https://github.com/rmetzger/incubator-flink/compare/tillrohrmann:akka_scala...rmetzger:flink456?expand=1 > > > > What the code does is collecting statistics about each TaskManager in the > > system. These stats are assembled into a "MetricsReport" which is send > with > > the periodical heartbeat to the JobManager. The JobManager stores the > > latest MetricsReport for each TaskManager (in the Instance object for > each > > TM). > > When the user accesses the TaskManager overview, the latest MetricsReport > > is send as a JSONObject to the browser. > > > > to test my changes, check out the code, build it > > mvn clean package -DskipTests -Dcheckstyle.skip=true > > go into > > cd > > > flink-dist/target/flink-0.8-incubating-SNAPSHOT-bin/flink-0.8-incubating-SNAPSHOT/ > > and start the web interface > > /bin/start-local.sh > > > > Go to localhost:8081, in the "TaskManager" view, you can see some > metrics. > > Here is a screenshot: http://img42.com/eNPve > > > > I named my branch after this issue, as it is probably describing best > what > > we're working on here: FLINK-456 > > <https://issues.apache.org/jira/browse/FLINK-456> > > > > As I said in the beginning, its really just a prototype. Let me know if > you > > have any further questions. > > For the "per TaskManager" reports, we should probably integrate some more > > statistics. Also, the presentation of the numbers is very very basic > right > > now. I think there are many good libraries for visualizing these kinds of > > stats. > > Also, the numbers currently represent only a "snapshot", however, some of > > the numbers can be accumulated (read/write bytes of the io manager). > > Another missing feature is storing a little history of numbers to > visualize > > metrics over time. > > > > I'm trying to find time to look into "per job" metrics as well. They will > > require a bit more infrastructure to distinguish them on the JobManager > > side and to get them on the TaskManagers. > > > > > > Best, > > Robert > > > > > > > > On Tue, Dec 2, 2014 at 2:53 PM, aalexandrov < > > alexander.s.alexand...@gmail.com> wrote: > > > >> Hello Nils, > >> > >> I am going to work on a similar issue related to tracking some basics > >> statistics of the intermediate results produced by dataflows during > >> execution. > >> > >> I just create a Jira issue here: > >> > >> https://issues.apache.org/jira/browse/FLINK-1297 > >> > >> If you already have some work done on extending the monitoring > capabilities > >> in a branch, it might be good to sync-up the development in order to > avoid > >> duplicated work (e.g. using the same communication channel used to send > the > >> data from the task managers to the job manager). > >> > >> > >> > >> -- > >> View this message in context: > >> > http://apache-flink-incubator-mailing-list-archive.1008284.n3.nabble.com/Enhance-Flink-s-monitoring-capabilities-tp2573p2713.html > >> Sent from the Apache Flink (Incubator) Mailing List archive. mailing > list > >> archive at Nabble.com. > >> >
