Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/14502#discussion_r73714157 --- Diff: core/src/main/scala/org/apache/spark/rdd/JdbcRDD.scala --- @@ -79,12 +79,18 @@ class JdbcRDD[T: ClassTag]( val conn = getConnection() val stmt = conn.prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY) - // setFetchSize(Integer.MIN_VALUE) is a mysql driver specific way to force streaming results, - // rather than pulling entire resultset into memory. - // see http://dev.mysql.com/doc/refman/5.0/en/connector-j-reference-implementation-notes.html - if (conn.getMetaData.getURL.matches("jdbc:mysql:.*")) { + val url = conn.getMetaData.getURL + if (url.matches("jdbc:mysql:.*")) { + // setFetchSize(Integer.MIN_VALUE) is a mysql driver specific way to force streaming results, + // rather than pulling entire resultset into memory. + // see http://dev.mysql.com/doc/refman/5.0/en/connector-j-reference-implementation-notes.html + stmt.setFetchSize(Integer.MIN_VALUE) logInfo("statement fetch size set to: " + stmt.getFetchSize + " to force MySQL streaming ") + } else if (url.matches("jdbc:postgresql:*")) { --- End diff -- OK got it. We'll leave that, but perhaps `setFetchSize(100)` for everything else. @princejwesley
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