Hi Dong, I don't think so. You can safely change that setting but then you need to recompile kylin to generate the new war(don't use the deploy.sh because that will wipe out all your kylin hbase meta storage). After the war is generated, put that war under Tomcat webapps directory and restarts the Tomcat. That should work well.
Best. Hua > -----邮件原件----- > 发件人: dev-return-1698- > [email protected] [mailto:dev-return- > [email protected]] 代表 dong > wang > 发送时间: 2015年5月15日 18:54 > 收件人: [email protected] > 主题: Re: Increase query performance > > I found the setting for the threshold locates in StorageContext.java, the > related piece of codes are: > public class StorageContext { > > public static final int HARD_THRESHOLD = 4000000; > > > thus, I have a question that currently I have already built some segments > successfully, later on, if I change the threshold much greater, will it > affect the > existing data in the cube storage? > > 2015-05-15 18:48 GMT+08:00 dong wang <[email protected]>: > > > Hi all, today I also met with the same problem, however, maybe mine is > > much more strange, the SQL lies in the following: > > select count(* ) from (select 1 from test1 where condtionx group by > > col1, col2, col3) t1 > > > > since the result of the sub query is greater than 4000000, the > > exception is thrown out~ however, the final row count of the the whole > > SQL is just 1 row, such kind of SQL is usually implemented to obtain > > the total row count of some queries for paging feature~ > > > > 2015-05-13 18:15 GMT+08:00 Parkavi Nandagopal <[email protected]>: > > > >> After getting that below error (Scan row count exceeded threshold: > >> 4000000), kylin is stopped/crashed automatically. > >> Is Kylin single point of Failure? > >> How to make it has an High availability? > >> > >> Thanks, > >> Parkavi. > >> > >> > >> -----Original Message----- > >> From: Parkavi Nandagopal > >> Sent: Wednesday, May 13, 2015 10:49 AM > >> To: dev; '[email protected]' > >> Subject: RE: Increase query performance > >> > >> Size of my hive fact table = 3.27 GB ( row count 25,236,160) Cube > >> size = > >> 2.21 GB > >> > >> I created hierarchy dimension with 18 levels. > >> Col1 -> Col2 -> ......upto Col18 > >> For this 18 levels, total cardinality = 2635 > >> > >> I attached 2 log files. > >> Log1 - query with limit 1000000 > >> Partial result came. > >> Log2 - Clicked show all in Query result. > >> Getting ERROR : exception while executing query: Scan row count > >> exceeded > >> threshold: 4000000, please add filter condition to narrow down > >> backend scan range, like where clause. > >> > >> Thanks, > >> Parkavi. > >> > >> -----Original Message----- > >> From: hongbin ma [mailto:[email protected]] > >> Sent: Wednesday, May 13, 2015 7:15 AM > >> To: dev > >> Subject: Re: Increase query performance > >> > >> before you expand your cluster, you might need to analyse why it's > >> delivering poor performance. > >> > >> how about the size of your hive fact table? the cardinality of the > >> dimension columns? > >> > >> if possible you can run a query,and paste the query's log in > >> KYLIN_HOME/logs/kylin.log for that query. we can help you check for > >> any abnormalities. (make sure you're writing a slightly different > >> query, to avoid hitting cache) > >> > >> On Tue, May 12, 2015 at 2:04 PM, Parkavi Nandagopal > >> <[email protected]> > >> wrote: > >> > >> > Hi , > >> > > >> > I have installed kylin and created cube(3GB size) with only one > >> > region server and when I query the cube data, it is taking much > >> > time to show the query result in Kylin web UI. > >> > If I add 3 or more region server node with high configuration and I > >> > create a cube then query the cube means will it increase the query > >> performance? > >> > > >> > > >> > Thanks, > >> > Parkavi. > >> > > >> > > >> > ::DISCLAIMER:: > >> > > >> > ------------------------------------------------------------------- > >> > --- > >> > ------------------------------------------------------------------- > >> > --- > >> > -------- > >> > > >> > The contents of this e-mail and any attachment(s) are confidential > >> > and intended for the named recipient(s) only. > >> > E-mail transmission is not guaranteed to be secure or error-free as > >> > information could be intercepted, corrupted, lost, destroyed, > >> > arrive late or incomplete, or may contain viruses in transmission. > >> > The e mail and its contents (with or without referred errors) shall > >> > therefore not attach any liability on the originator or HCL or its > >> > affiliates. > >> > Views or opinions, if any, presented in this email are solely those > >> > of the author and may not necessarily reflect the views or opinions > >> > of HCL or its affiliates. Any form of reproduction, dissemination, > >> > copying, disclosure, modification, distribution and / or > >> > publication of this message without the prior written consent of > >> > authorized representative of HCL is strictly prohibited. If you > >> > have received this email in error please delete it and notify the > >> > sender immediately. > >> > Before opening any email and/or attachments, please check them for > >> > viruses and other defects. > >> > > >> > > >> > ------------------------------------------------------------------- > >> > --- > >> > ------------------------------------------------------------------- > >> > --- > >> > -------- > >> > > >> > >> > >> > >> -- > >> Regards, > >> > >> *Bin Mahone | 马洪宾* > >> Apache Kylin: http://kylin.io > >> Github: https://github.com/binmahone > >> > > > >
