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From Vitalii Diravka <vitalii.dira...@gmail.com>
Subject Re: Requesting guidance. Having trouble generating parquet files from jdbc connection to PostgreSQL. "java.lang.OutOfMemoryError: GC overhead limit exceeded"
Date Mon, 13 Aug 2018 17:33:29 GMT
Hi Reid,

Look like your issue is similar to DRILL-4177 [1].
It was related to MySQL connection. Looks like the similar issue is with
Looking at the Postgres documentation, the code needs to explicitly set the
connection autocommit mode
to false e.g. conn.setAutoCommit(false) [2]. For data size of 10 million
plus, this is a must.

You could disable "Auto Commit" option as session option [3]
or to do it within plugin config URL with the following property:
*defaultAutoCommit=false* [4]

[1] https://issues.apache.org/jira/browse/DRILL-4177
[3] https://www.postgresql.org/docs/9.3/static/ecpg-sql-set-autocommit.html
[4] https://jdbc.postgresql.org/documentation/head/ds-cpds.html

Kind regards

On Mon, Aug 13, 2018 at 3:03 PM Reid Thompson <Reid.Thompson@omnicell.com>

> My standalone host is configured with 16GB RAM, 8 cpus.  Using
> drill-embedded (single host standalone), I am attempting to pull data
> from PostgreSQL tables to parquet files via CTAS. Smaller datasets work
> fine, but larger data sets fail (for example ~11GB) with
> "java.lang.OutOfMemoryError: GC overhead limit exceeded"  Can someone
> advise on how to get past this?
> Is there a way to have drill stream this data from PostgreSQL to parquet
> files on disk, or does the data set have to be completely loaded into
> memory before it can be written to disk?  The documentation indicates
> that drill will spill to disk to avoid memory issues, so I had hoped
> that it would be straightforward to extract from the DB to disk.
> Should I not be attempting this via CTAS?  What are the other options?
> thanks,
> reid

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