Thank you for your kind reply, please answer 1 more question about version 5:
In version 4.x we run query against a Cube very obviously, but in version 5, the cube usage is a implication socan you advise: for a given query, which model will be used, which index (cube) will be used for this query? Thank you On Wed, Nov 1, 2023 at 1:42 PM Xiaoxiang Yu <x...@apache.org> wrote: > 1. How do I measure the size of the index (cube) in version 5? > You can check storage of specific Indexes from the Index page. > > https://kylin.apache.org/5.0/docs/modeling/model_design/aggregation_group#view-aggregate-index > or > https://kylin.apache.org/5.0/assets/images/index_1-6ad3f55183d4ed61962359d9408ba192.png > > > 2. How to create the cardinality for each column? > You should check this link : > https://kylin.apache.org/5.0/docs/datasource/data_sampling/ . > > 3. In your default project sample named SSB project, you have only 4 > simple aggregate group index and no table index as in attached file > so what is the best strategy to select index for our OLAP? > 1. There does exist a 'Base Table Index' by default actually, its id > is 20000000001. > 2. I think it is a good question and Kylin 5 lacks such a guide for > better modeling. You are free to ask your question to > mailing list and I will try to reply. > > ------------------------ > With warm regard > Xiaoxiang Yu > > > > On Wed, Nov 1, 2023 at 2:12 PM Xiaoxiang Yu <x...@apache.org> wrote: > >> OK, I didn't read all the mail history so I misunderstand the situation. >> Looks like you need to analyse >> the cause why the query didn't hit the cube correctly. >> >> Please generate query diagnosis package and send it to me privately. I >> will analyse the query log. >> You can refer to the following steps in screenshots. >> >> [image: image.png] >> >> If the screenshots are not displaying correctly, please read this guide : >> >> https://kylin.apache.org/5.0/docs/operations/system-operation/diagnosis/#generate-query-diagnosis-package-in-web-ui >> >> By the way, you need to analyse the cause by reading kylin.query.log, not >> the kylin.log, >> refer to https://kylin.apache.org/5.0/docs/operations/logs/system_log >> >> ------------------------ >> With warm regard >> Xiaoxiang Yu >> >> >> >> On Wed, Nov 1, 2023 at 12:18 PM Nam Đỗ Duy <na...@vnpay.vn> wrote: >> >>> Thank you Xiaoxiang for your advice. As my title email shown, I guessed >>> that the OLAP functionalities has not been correctly set up in my computer. >>> >>> The evidence about it is that: when I disable the Pushdown option box to >>> use solely the precomputation cube only, it showed following error: Please >>> kindly advise how to properly build the OLAP >>> >>> LIMIT 500": No realization found for OLAPContext, MODEL_UNMATCHED_JOIN, >>> rel#2240:KapTableScan.OLAP.[](table=[VNEVENT_HIVE_DWH_400MILLION_ROWS, >>> FACTUSEREVENT],ctx=0@null,fields=[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, >>> 13, 14, 15, 16, 17, 18, 19, 20]) >>> >>> >>> >>> On Wed, Nov 1, 2023 at 10:40 AM Xiaoxiang Yu <x...@apache.org> wrote: >>> >>>> Hi, >>>> >>>> Yesterday, I tried to see if query pushdown functions work well in >>>> the Kylin5 docker, and all of my queries return proper responses . >>>> After checking your logs from Shaofeng, I found these error >>>> messages repeated many times: >>>> 1. 'java.io.IOException: All datanodes DatanodeInfoWithStorage[ >>>> 127.0.0.1:9866,DS-5093899b-06c7-4386-95d5-6fc271d92b52,DISK] are bad. >>>> Aborting...' >>>> 2. 'curator.ConnectionState : Connection timed out for connection >>>> string (localhost:2181) and timeout (15000) / elapsed (41794) >>>> org.apache.curator.CuratorConnectionLossException: KeeperErrorCode = >>>> ConnectionLoss' >>>> >>>> I guess the root cause is that the container didn't not have enough >>>> resources. I found you query on a table called >>>> 'XXX_hive_dwh_400million_rows', looks like you gave a complex query on a >>>> table which contains 400 million rows? >>>> >>>> Since I am the uploader of kylin5 's docker image, I want to give >>>> some explainment. Kylin5 docker is not a place for performance benchmarks, >>>> it is only for demonstration. It is only allocated with very little >>>> resources(8G memory) if you are using the default command from docker hub >>>> page. Before I uploaded my image, I only tested my image using the ssb >>>> dataset, which the biggest table only contains about 60k rows. If you are >>>> using a larger dataset and complexer queries, you have to scale the >>>> resource properly. Try querying tables which contain not more than 100k >>>> rows by default. >>>> >>>> Here are some tips which may help you to check if the daemon >>>> service is in health status and resources(particularly disk space) is >>>> configured properly. >>>> >>>> 1. Checking HDFS 's web ui( >>>> http://localhost:9870/dfshealth.html#tab-datanode ) to confirm whether >>>> HDFS service is in 'In service' status. >>>> 2. Checking Datanode 's log in >>>> `/opt/hadoop-3.2.1/logs/hadoop-root-datanode-Kylin5-Machine.log`, check if >>>> there is any error message. Like: cat >>>> /opt/hadoop-3.2.1/logs/hadoop-root-datanode-Kylin5-Machine.log | grep ERROR >>>> | wc -l >>>> 3. Checking if your docker engine is configured with enough disk >>>> space, if you are using Docker Desktop like me,please go to "Settings" - >>>> "Resources" - "Advanced", make sure you have allocated 40GB+ disk space to >>>> the docker container. >>>> 4. Checking the available disk space of your container by `df -h`, >>>> make sure the 'Use%' of 'overlay' is less than 60% . >>>> 5. Checking the load average/ cpu usage/ jvm gc. Make sure these >>>> metrics are not really high when you send a query. >>>> ------------------------ >>>> With warm regard >>>> Xiaoxiang Yu >>>> >>>> >>>> >>>> On Tue, Oct 31, 2023 at 5:13 PM Nam Đỗ Duy <na...@vnpay.vn.invalid> >>>> wrote: >>>> >>>>> Hi ShaoFeng >>>>> >>>>> Thank you very much for your valuable feedback >>>>> >>>>> I saw the application to be there (if I see it right) as in the >>>>> attachment photo. Kindly advise so that I can run this query on OLAP. >>>>> >>>>> PS. I sent you the log file in private. >>>>> >>>>> [image: image.png] >>>>> >>>>> On Tue, Oct 31, 2023 at 3:11 PM ShaoFeng Shi <shaofeng...@apache.org> >>>>> wrote: >>>>> >>>>>> Can you provide the messages in logs/kylin.log when executing the >>>>>> SQL? and you can also check the Spark UI from yarn resource manager >>>>>> (there >>>>>> should be one running application called Spardar, which is Kylin's >>>>>> backend >>>>>> spark application). If the application is not there, it may indicates the >>>>>> yarn doesn't have resource to startup it. >>>>>> >>>>>> Best regards, >>>>>> >>>>>> Shaofeng Shi 史少锋 >>>>>> Apache Kylin PMC, >>>>>> Apache Incubator PMC, >>>>>> Email: shaofeng...@apache.org >>>>>> >>>>>> Apache Kylin FAQ: >>>>>> https://kylin.apache.org/docs/gettingstarted/faq.html >>>>>> Join Kylin user mail group: user-subscr...@kylin.apache.org >>>>>> Join Kylin dev mail group: dev-subscr...@kylin.apache.org >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Nam Đỗ Duy <na...@vnpay.vn> 于2023年10月31日周二 10:35写道： >>>>>> >>>>>>> Dear Sir/Madam, >>>>>>> >>>>>>> I have a fact with 500million rows then I build model, index >>>>>>> according to the website help. >>>>>>> >>>>>>> I chose full incremental because this is the first times I load data >>>>>>> >>>>>>> I create both index types Aggregate group index, table index as >>>>>>> photo attached. >>>>>>> >>>>>>> But the query always failed after timeout of 300 seconds (I run in >>>>>>> docker), I dont want to increase the value of 300 seconds because I wish >>>>>>> the OLAP can run within 1 minutes (is that possible?) >>>>>>> >>>>>>> It seems that the OLAP function in indexing not working to speedup >>>>>>> the query by precomputed cube. >>>>>>> >>>>>>> Can you advise to check whether the index did really work? >>>>>>> >>>>>>> It is quite urgent task for me so prompt response is highly >>>>>>> appreciated. >>>>>>> >>>>>>> Thank you very much >>>>>>> >>>>>>
