This is something I've encountered when doing ETL with hive and having it create 10's of thousands partitions. The issue is each partition needs to be added to the metastore and this is an expensive operation to perform. My work around was adding a flag to hive that optionally disables the metastore partition creation step. This may not be a solution for everyone as that table then has no partitions and you would have to run msck repair but depending on your use case, you may just want the data in hdfs.
If there is interest in having this be an option I'll make a ticket and submit the patch. -Slava On Mon, Apr 13, 2015 at 10:40 PM, Xu, Cheng A <cheng.a...@intel.com> wrote: > Hi Tianqi, > > Can you attach hive.log as more detailed information? > > +Sergio > > > > Yours, > > Ferdinand Xu > > > > *From:* Tianqi Tong [mailto:tt...@brightedge.com] > *Sent:* Friday, April 10, 2015 1:34 AM > *To:* user@hive.apache.org > *Subject:* [Hive] Slow Loading Data Process with Parquet over 30k > Partitions > > > > Hello Hive, > > I'm a developer using Hive to process TB level data, and I'm having some > difficulty loading the data to table. > > I have 2 tables now: > > > > -- table_1: > > CREATE EXTERNAL TABLE `table_1`( > > `keyword` string, > > `domain` string, > > `url` string > > ) > > PARTITIONED BY (yearmonth INT, partition1 STRING) > > STORED AS RCfile > > > > -- table_2: > > CREATE EXTERNAL TABLE `table_2`( > > `keyword` string, > > `domain` string, > > `url` string > > ) > > PARTITIONED BY (yearmonth INT, partition2 STRING) > > STORED AS Parquet > > > > I'm doing an INSERT OVERWRITE to table_2 from SELECT FROM table_1 with > dynamic partitioning, and the number of partitions grows dramatically from > 1500 to 40k (because I want to use something else as partitioning). > > The mapreduce job was fine. > > Somehow the process stucked at " Loading data to table default.table_2 > (yearmonth=null, domain_prefix=null) ", and I've been waiting for hours. > > > > Is this expected when we have 40k partitions? > > > > -------------------------------------------------------------- > > Refs - Here are the parameters that I used: > > export HADOOP_HEAPSIZE=16384 > > set PARQUET_FILE_SIZE=268435456; > > set parquet.block.size=268435456; > > set dfs.blocksize=268435456; > > set parquet.compression=SNAPPY; > > SET hive.exec.dynamic.partition.mode=nonstrict; > > SET hive.exec.max.dynamic.partitions=500000; > > SET hive.exec.max.dynamic.partitions.pernode=50000; > > SET hive.exec.max.created.files=1000000; > > > > > > Thank you very much! > > Tianqi Tong > -- Slava Markeyev | Engineering | Upsight
