Github user emlaver commented on the issue:
https://github.com/apache/bahir/pull/45
WIP: While running tests against databases with a size > 500 MB,
`java.lang.OutOfMemoryError: Java heap space` error would occur (even when
setting `--conf spark.driver.memory=10g`). I believe this has to do with how
the HTTP request is setup and called against the `_changes API` in
[JsonStoreDataAccess.scala](https://github.com/apache/bahir/pull/45/files#diff-ab440bd537d48f7cf58cd9cf0ea143b1).
Good news is I've created a test that uses Spark streaming (using
CloudantReceiver.java) to read all docs from a Cloudant database into a Spark
DataFrame. It should work for a SQL Temp Table. I ran this test without any
java heap errors against a database size of 1 GB, 1.8 GB, and 14.2 GB.
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