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Apache kudu

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Apache kudu

Explorer

hi,I am woking on kudu and oracle. I have more than 5 million records and i have been asked to read them from oracle and write into kudu table.what i did was,one way i did a ojdbc connection,got the records from oracle and insert into kudu table using partial row and insert menthod. i just want to know if i could do bulk inserts to avoid more time on writes 

2 ACCEPTED SOLUTIONS

Accepted Solutions

Re: Apache kudu

Expert Contributor

Another option is to write a Spark job that uses multiple tasks to read from Oracle and write to Kudu in parallel, or something equivalent using multiple processes or threads.

Re: Apache kudu

Expert Contributor

Are you sure the bottleneck is Kudu? Maybe the bottleneck is reading from Oracle?

 

Using the Kudu AUTO_FLUSH_BACKGROUND mode should give pretty fast throughput when writing. See https://kudu.apache.org/apidocs/org/apache/kudu/client/SessionConfiguration.FlushMode.html

 

You can also try increasing the KuduSession.setMutationBufferSpace() value, also consider your partitioning scheme.

 

If you want more parallelism you can also consider scanning different ranges in Oracle with different processes or threads on the same or different client machine and perform more parallelized writes to Kudu.

8 REPLIES 8

Re: Apache kudu

Explorer

can i do bulk insert, if so please tell me how to 

Re: Apache kudu

Explorer

if i do the writes as per the program given in https://github.com/cloudera/kudu-examples/tree/master/java/java-sample/src/main/java/org/kududb/exam...

 

it takes an hour to insert the data in kudu table.

 

How can i insert the records in lesser time 

 

Re: Apache kudu

Expert Contributor

One option is to export to Parquet on HDFS using Sqoop, then use Impala to CREATE TABLE AS SELECT * FROM your parquet table into your Kudu table.

 

Unfortunately Sqoop does not have support for Kudu at this time.

Re: Apache kudu

Expert Contributor

Another option is to write a Spark job that uses multiple tasks to read from Oracle and write to Kudu in parallel, or something equivalent using multiple processes or threads.

Highlighted

Re: Apache kudu

Explorer

thank you but i just want to use java and do batch insert,is tere any way to perfrom faster writes on kudu table using java 

Re: Apache kudu

Expert Contributor

Are you sure the bottleneck is Kudu? Maybe the bottleneck is reading from Oracle?

 

Using the Kudu AUTO_FLUSH_BACKGROUND mode should give pretty fast throughput when writing. See https://kudu.apache.org/apidocs/org/apache/kudu/client/SessionConfiguration.FlushMode.html

 

You can also try increasing the KuduSession.setMutationBufferSpace() value, also consider your partitioning scheme.

 

If you want more parallelism you can also consider scanning different ranges in Oracle with different processes or threads on the same or different client machine and perform more parallelized writes to Kudu.

Re: Apache kudu

New Contributor

Hi,

 

I need to load the data from HIVE to KUDU table using pyspark code.  i am able to insert one record using table.new_insert but could not able to load all the records at once..the way am looking is, getting the data into dataframe and load that dataframe data into KUDU table.  i found example using JAVA but not with Python.  will you please help.

 

Thx.

Re: Apache kudu

Contributor

Hi,

 

I don't know much about Kudu+PySpark except that there is a lot of room for improvement there, but maybe a couple of examples in the following patch-in-flight could be useful: https://gerrit.cloudera.org/#/c/13102/