Can you please check your hdfs space once? If it is fine please increase java heap memory in hive-env.sh file
On Mon, Jun 23, 2014 at 2:00 AM, Dima Machlin <dima.mach...@pursway.com> wrote: > I don't see how this is "same" or even remotely related to my issue. > > It would be better for you to send it with a different and informative > subjects on a separate mail. > > > > *From:* Matouk IFTISSEN [mailto:matouk.iftis...@ysance.com] > *Sent:* Monday, June 23, 2014 11:49 AM > *To:* user@hive.apache.org > *Subject:* Re: Hive 0.12 Mapjoin and MapJoinMemoryExhaustionException > > > > Hello, > > I have as the same problem, but in other manner > > the map 100 % > > the reduce 100% and then the reduce decrise in 75 % !! > > I use a lag function in hive, table (my_first_table) has 15million rows : > > > > > > > > > *INSERT INTO TABLE my_table select *, case when nouvelle_tache = '1' then > 'pas de rejeu' else if (lag(opg_id,1) OVER (PARTITION BY opg_par_id order > by date_execution) is null, opg_id, lag(opg_id,1) OVER (PARTITION BY > opg_par_id order by date_execution) ) end opg_par_id_1, others_columns from > my_first_table* > > *--- to limit the number of row I have thought that is a memory proble > but, not because I have a lot of free memory* > > > *where column5 > '37123T0104-10510' and column5 <= '69191R0025-10162' > order bycolumn5 ;* > > > > no error in log , Please healp what is wrong ?? > > This the detail for tracker (full log): > > Regards > > > > 2014-06-23 10:18 GMT+02:00 Dima Machlin <dima.mach...@pursway.com>: > > Hello, > > We are running Hive 0.12 and using the hive.auto.convert.join feature when > : > > hive.auto.convert.join.noconditionaltask.size = 50000000 > > hive.mapjoin.followby.gby.localtask.max.memory.usage = 0.7 > > > > The query is a mapjoin with a group by afterwards like so : > > > > select id,x,max(y) > > from ( > > select t1.id,t1.x,t2.y from tbl1 join tbl2 on (t1.id=t2.id) > > ) z > > group by id,x; > > > > > > While executing a join to a table that has ~3m rows we are failing on : > > > > org.apache.hadoop.hive.ql.exec.mapjoin.MapJoinMemoryExhaustionException: > 2014-06-10 04:42:21 Processing rows: 2500000 Hashtable size: > 2499999 Memory usage:704765184 percentage: 0.701 > > at > org.apache.hadoop.hive.ql.exec.mapjoin.MapJoinMemoryExhaustionHandler.checkMemoryStatus(MapJoinMemoryExhaustionHandler.java:91) > > > > This is understood as we pass the 70% limit. > > But, the table only takes 35mb in the HDFS and somehow reading it to the > hash table increases it size drastically when in the end it fails after > reaching ~700mb. > > > > So this is the first question - why does it take so much space in memory? > > > > Later, i tried to increase > hive.mapjoin.followby.gby.localtask.max.memory.usage to allow the mapjoin > to finish. By doing so i got another problem. > > The table is in fact loaded to memory as seen here : > > > > Processing rows: 2900000 Hashtable size: 2899999 Memory usage: > 818590784 percentage: 0.815 > > INFO exec.HashTableSinkOperator: 2014-05-28 12:16:42 Processing > rows: 2900000 Hashtable size: 2899999 Memory usage: > 818590784 percentage: 0.815 > > INFO exec.TableScanOperator: 0 finished. closing... > > INFO exec.TableScanOperator: 0 forwarded 2946773 rows > > INFO exec.HashTableSinkOperator: 1 finished. closing... > > INFO exec.HashTableSinkOperator: Temp URI for side table: > file:/tmp/hadoop/hive_2014-05-28_12-16-21_239_3089817264132856114-94/-local-10004/HashTable-Stage-2 > > Dump the side-table into file: > file:/tmp/hadoop/hive_2014-05-28_12-16-21_239_3089817264132856114-94/-local-10004/HashTable-Stage-2/MapJoin-mapfile691--.hashtable > > INFO exec.HashTableSinkOperator: 2014-05-28 12:16:42 Dump the side-table > into file: > file:/tmp/hadoop/hive_2014-05-28_12-16-21_239_3089817264132856114-94/-local-10004/HashTable-Stage-2/MapJoin-mapfile691--.hashtable > > Upload 1 File to: > file:/tmp/hadoop/hive_2014-05-28_12-16-21_239_3089817264132856114-94/-local-10004/HashTable-Stage-2/MapJoin-mapfile691--.hashtable > > INFO exec.HashTableSinkOperator: 2014-05-28 12:16:45 Upload 1 File to: > file:/tmp/hadoop/hive_2014-05-28_12-16-21_239_3089817264132856114-94/-local-10004/HashTable-Stage-2/MapJoin-mapfile691--.hashtable > > INFO exec.HashTableSinkOperator: 1 forwarded 0 rows > > INFO exec.HashTableSinkOperator: 1 forwarded 0 rows > > INFO exec.TableScanOperator: 0 Close done > > End of local task; Time Taken: 10.745 sec. > > > > *But then, the join stage hangs for long time and fails on OOM.* > > > > From the logs, i can see that it hangs on this line : > > > > 2014-05-28 12:16:58,229 INFO > org.apache.hadoop.hive.ql.exec.MapJoinOperator: ******* Load from HashTable > File: input : > maprfs:/user/hadoop/tmp/hive/hive_2014-05-28_12-16-21_239_3089817264132856114-94/-mr-10003/000000_0 > > 2014-05-28 12:16:58,230 INFO > org.apache.hadoop.hive.ql.exec.MapJoinOperator: Load back 1 > hashtable file from tmp file > uri:/tmp/mapr-hadoop/mapred/local/taskTracker/hadoop/distcache/-479500712399318067_367753608_1109273133/maprfs/user/hadoop/tmp/hive/hive_2014-05-28_12-16-21_239_3089817264132856114-94/-mr-10005/HashTable-Stage-2/Stage-2.tar.gz/MapJoin-mapfile691--.hashtable > > 2014-05-28 12:18:31,302 INFO org.apache.hadoop.hive.ql.exec.MapOperator: 6 > finished. closing... > > > > It hangs on "Load back 1 hashtable file from tmp" for 1:33 minutes and > then we get the exception : > > > > > > 2014-05-28 12:18:31,304 WARN org.apache.hadoop.ipc.Client: Unexpected > error reading responses on connection Thread[IPC Client (47) connection to / > 127.0.0.1:48520 from job_201405191528_9910,5,main] > > java.lang.OutOfMemoryError: Java heap space > > at java.lang.StringBuffer.toString(StringBuffer.java:585) > > at org.apache.hadoop.io.UTF8.readString(UTF8.java:209) > > at > org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:179) > > at > org.apache.hadoop.io.ObjectWritable.readFields(ObjectWritable.java:66) > > at > org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:829) > > at > org.apache.hadoop.ipc.Client$Connection.run(Client.java:725) > > 2014-05-28 12:18:31,306 INFO org.apache.hadoop.mapred.Task: Communication > exception: java.io.IOException: Call to /127.0.0.1:48520 failed on local > exception: java.io.IOException: Error reading responses > > at > org.apache.hadoop.ipc.Client.wrapException(Client.java:1136) > > at org.apache.hadoop.ipc.Client.call(Client.java:1098) > > at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:275) > > at $Proxy0.ping(Unknown Source) > > at > org.apache.hadoop.mapred.Task$TaskReporter.run(Task.java:680) > > at java.lang.Thread.run(Thread.java:662) > > Caused by: java.io.IOException: Error reading responses > > at > org.apache.hadoop.ipc.Client$Connection.run(Client.java:732) > > Caused by: java.lang.OutOfMemoryError: Java heap space > > at java.lang.StringBuffer.toString(StringBuffer.java:585) > > at org.apache.hadoop.io.UTF8.readString(UTF8.java:209) > > at > org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:179) > > at > org.apache.hadoop.io.ObjectWritable.readFields(ObjectWritable.java:66) > > at > org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:829) > > at > org.apache.hadoop.ipc.Client$Connection.run(Client.java:725) > > > > Port 127.0.0.1:48520 is the tasktracker. > > > > The file the local stage uploaded "MapJoin-mapfile691--.hashtable" is > only 87MB > > The zip in which its located "Stage-2.tar.gz" is only 23MB > > > > *What's going on here? Why can the join continue successfully? * > > > > Last, i tried removing the group by from the query. After doing so, the > query ends with no problem (setting > hive.mapjoin.followby.gby.localtask.max.memory.usage more than 0.82) > > No hangs or anything. > > > > *How can the group by effect the "Load back 1 hashtable file from tmp" > step in any way?* > > > > Thanks in advance for any answers/comments. > > ----------------------------------------------- > > [image: cid:image001.jpg@01CE92B5.CB034C90] > > *Dima Machlin, **Big Data Architect* > > 15 Abba Eban Blvd. PO Box 4125, Herzliya 46140 IL > > P: +972-9-9518147 |M: +972-54-5671337|F: +972-9-9584736 > > *Pursway.com* <http://www.pursway.com/> > > > > > > > -- > > *Matouk IFTISSEN | Consultant BI & Big Data* > * [image: http://www.ysance.com] * > 24 rue du sentier - 75002 Paris - www.ysance.com > Fax : +33 1 73 72 97 26 > *Ysance sur* :*Twitter* <http://twitter.com/ysance>* | Facebook > <https://www.facebook.com/pages/Ysance/131036788697> | Google+ > <https://plus.google.com/u/0/b/115710923959357341736/115710923959357341736/posts> > | LinkedIn > <http://www.linkedin.com/company/ysance> | Newsletter > <http://www.ysance.com/nous-contacter.html>* > *Nos autres sites* : *ys4you* <http://wwww.ys4you.com/>* | labdecisionnel > <http://www.labdecisionnel.com/> | decrypt <http://decrypt.ysance.com/>* > > > > > > ************************************************************************************ > This footnote confirms that this email message has been scanned by > PineApp Mail-SeCure for the presence of malicious code, vandals & computer > viruses. > > ************************************************************************************ > -- With Thanks & Regards Nagarjuna Vissarapu 9052179339
