Hi Abhilash, I would like to recommend to upgrade to v1.0 or v1.1 (is under releasing process now).
Thanks. Luke Best Regards! --------------------- Luke Han On Wed, Sep 30, 2015 at 12:46 AM, Abhilash L L <[email protected]> wrote: > Hello, > > We observered that purging and dropping a cube is not deleting > dictionaries / snapshots and also not dropping the table in hbase. > > Also, its leaving a lot of temporary data in hdfs > > We are on 0.7.2. I hope it is being fixed shortly and on priority. > > I saw that the ticket has been fixed on v1.1 and v2. Can this be back > ported to 0.7.2 > > > Regards, > Abhilash > > On Fri, Sep 18, 2015 at 11:02 AM, yu feng <[email protected]> wrote: > > > After build another cube successfully, I recheck this bug and find the > > reason, thanks to all of you ... > > > > 2015-09-11 11:17 GMT+08:00 ShaoFeng Shi <[email protected]>: > > > > > If "rowkey_stats" wasn't found, Kylin should throw exception and exit, > > > instead of using 1 region silently; I'm going to change this, please > let > > me > > > know if you don't agree. > > > > > > 2015-09-11 10:17 GMT+08:00 Yerui Sun <[email protected]>: > > > > > > > Hi, yu feng, > > > > Let me guess the reason of your problem. > > > > > > > > The num of reducers of converting hfile job depends on the region > > > > numbers of corresponding HTable. > > > > > > > > For now, all HTables were created with only one region, caused by > the > > > > wrong path of rowkey_stats. I’ve opened a jira for this issue: > > > > https://issues.apache.org/jira/browse/KYLIN-968. The patch has been > > > > available last night. > > > > > > > > Here’s some clues to confirm my guessing: > > > > 1. You can find the corresponding HTable name in log, check its > > > regions, > > > > it should have only one region. > > > > 2. Check your kylin working directory on hdfs, there should be a > path > > > > like ‘../kylin-null/../rowkey_stats'. > > > > 3. Grep your kylin.log in tomcat dir, you should find the log > > contains > > > > ‘no region split, HTable will be one region’. > > > > > > > > If you hit all the three clues, I think KYLIN-968 could resolve > your > > > > problem. > > > > > > > > > > > > > 在 2015年9月11日，00:54，yu feng <[email protected]> 写道： > > > > > > > > > > OK, I find another problem(I am a problem maker, ^_^), today I buid > > > this > > > > > cube which has 15 dimensions(one Mandatory dimension, to hierarchy > > > > > dimension and others are normal dimension), I find cuboid files are > > > > 1.9TB, > > > > > in the step of converting cuboid to hfile it is too slow. I check > the > > > log > > > > > of this job and find there are 9000+ mappers and only one reducer. > > > > > > > > > > I discard this job when our hadoop administrator tells me the node > > > witch > > > > > run this reducer is out of space of disk. I have to stop it, I am > > doubt > > > > > that why there are only one reducer(I do not check source code of > > this > > > > > job), By the way, my original data is only hundreds MB. I think > this > > > > would > > > > > cause more problems if original is bigger or dimension is much > more.. > > > > > > > > > > 2015-09-10 23:46 GMT+08:00 Luke Han <[email protected]>: > > > > > > > > > >> The 2.0 will not come recently, there are huge refactor and bunch > of > > > new > > > > >> features, we have to make sure there are no critical bugs before > > > > release. > > > > >> > > > > >> The same function also available under v1.x branch, please stay > > tuned > > > > for > > > > >> update information for that. > > > > >> > > > > >> Thanks. > > > > >> > > > > >> > > > > >> Best Regards! > > > > >> --------------------- > > > > >> > > > > >> Luke Han > > > > >> > > > > >> On Thu, Sep 10, 2015 at 7:50 PM, yu feng <[email protected]> > > > wrote: > > > > >> > > > > >>> What good news ! I wish you can release the version as quickly > as > > > > >>> possible, Today, I build a cube whose cuboid files is 1.9TB. If > we > > > > merge > > > > >>> cube based on cuboid files, I think it will be very slowly.. > > > > >>> > > > > >>> 2015-09-10 19:34 GMT+08:00 Shi, Shaofeng <[email protected]>: > > > > >>> > > > > >>>> We have implemented the merge from HTable directly in Kylin 2.0, > > > which > > > > >>>> hasn’t been released/announced. > > > > >>>> > > > > >>>> On 9/10/15, 7:22 PM, "yu feng" <[email protected]> wrote: > > > > >>>> > > > > >>>>> I think kylin can finish merging just depend on tables on > hbase, > > > This > > > > >>> will > > > > >>>>> make merging cubes more quickly, Isn't it ? > > > > >>>>> > > > > >>>>> 2015-09-10 19:16 GMT+08:00 yu feng <[email protected]>: > > > > >>>>> > > > > >>>>>> After check source code, I find you are right, cuboid files > will > > > be > > > > >>> used > > > > >>>>>> while merging segments, But a new question comes, Why kylin > > merge > > > > >>>>>> segment > > > > >>>>>> just based on hfile, I can not find how to take hbase table as > > > input > > > > >>>>>> format > > > > >>>>>> of mapreduce job, But kylin take HFileOutputFormat as output > > > format > > > > >>>>>> while > > > > >>>>>> changing cuboid to hfile. > > > > >>>>>> > > > > >>>>>> From this, I find kylin will take more space for a cube > > actually , > > > > >> not > > > > >>>>>> only hfile but also cuboid files, the former are used for > query > > > and > > > > >>> the > > > > >>>>>> latter are used for merge, and the capacity of cuboid files is > > > > >> bigger > > > > >>>>>> than > > > > >>>>>> hfiles. > > > > >>>>>> > > > > >>>>>> I think we could do some thing to optimize it... I want to > know > > > your > > > > >>>>>> opinions about it . > > > > >>>>>> > > > > >>>>>> 2015-09-10 18:36 GMT+08:00 Yerui Sun <[email protected]>: > > > > >>>>>> > > > > >>>>>>> Hi, yu feng, > > > > >>>>>>> I’ve also noticed these files and opened a jira: > > > > >>>>>>> https://issues.apache.org/jira/browse/KYLIN-978, and I’ll > > post a > > > > >>> patch > > > > >>>>>>> tonight. > > > > >>>>>>> > > > > >>>>>>> Here’s my opinions on your three question, feel free to > > correct > > > > >> me: > > > > >>>>>>> > > > > >>>>>>> First, the data path of intermediate hive table should be > > > deleted > > > > >>>>>>> after > > > > >>>>>>> building, I agreed with that. > > > > >>>>>>> > > > > >>>>>>> Second, the cuboid files will be used for merge and will be > > > > >> deleted > > > > >>>>>>> when merging job completed, we need and must leave them on > > hdfs. > > > > >> The > > > > >>>>>>> fact_distint_columns should be deleted. In additionally, the > > path > > > > >> of > > > > >>>>>>> rowkey_stats and hfile > > > > >>>>>>> should also be deleted. > > > > >>>>>>> > > > > >>>>>>> Third, there’s no garbage collection steps if a job discard, > > > > >> maybe > > > > >>> we > > > > >>>>>>> need a patch for this. > > > > >>>>>>> > > > > >>>>>>> > > > > >>>>>>> Short answer: > > > > >>>>>>> KYLIN-978 will clean all hdfs path except cuboid files after > > > > >>> buildJob > > > > >>>>>>> and mergeJob completed. > > > > >>>>>>> The hdfs path will not be cleanup if a job was discarded, we > > > need > > > > >>>>>>> improvement on this. > > > > >>>>>>> > > > > >>>>>>> > > > > >>>>>>> Best Regards, > > > > >>>>>>> Yerui Sun > > > > >>>>>>> [email protected] > > > > >>>>>>> > > > > >>>>>>> > > > > >>>>>>> > > > > >>>>>>>> 在 2015年9月10日，18:20，yu feng <[email protected]> 写道： > > > > >>>>>>>> > > > > >>>>>>>> I see this core Improvement in release 1.0, JIRA url : > > > > >>>>>>>> https://issues.apache.org/jira/browse/KYLIN-926 > > > > >>>>>>>> > > > > >>>>>>>> However, after my test and check the source code , I find > some > > > > >>>>>>> rubbish(I am not > > > > >>>>>>>> sure) file in HDFS. > > > > >>>>>>>> > > > > >>>>>>>> First, kylin only drop the Intermediate table in hive, but > the > > > > >>> table > > > > >>>>>>> is > > > > >>>>>>> an > > > > >>>>>>>> EXTERNAL table, the file still exist in kylin tmp directory > in > > > > >>> HDFS(I > > > > >>>>>>> check > > > > >>>>>>>> that..) > > > > >>>>>>>> > > > > >>>>>>>> Second, the cuboid files take a large space in HDFS, and > kylin > > > do > > > > >>> not > > > > >>>>>>>> delete after the cube build(fact_distinct_columns files > exist > > > > >> too). > > > > >>>>>>> I am > > > > >>>>>>>> not sure if those has other effects, remind me please if it > > > has.. > > > > >>>>>>>> > > > > >>>>>>>> Third, After I discard a job, I think kylin should delete > the > > > > >>>>>>> Intermediate > > > > >>>>>>>> files and drop Intermediate hive table, even though delete > > > > >>>>>>>> them asynchronous. I think those data do not have any > > > > >>>>>>> effects..remind me > > > > >>>>>>>> please if it has.. > > > > >>>>>>>> > > > > >>>>>>>> These are rubbish datas still exist in current > > > > >> version(kylin-1.0), > > > > >>>>>>> please > > > > >>>>>>>> check, thanks.. > > > > >>>>>>> > > > > >>>>>>> > > > > >>>>>> > > > > >>>> > > > > >>>> > > > > >>> > > > > >> > > > > > > > > > > > > > >
