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(Updated May 28, 2015, 2:48 p.m.) Review request for hive, Szehon Ho, Thejas Nair, and Xuefu Zhang. Changes ------- Revised based on Thejas's comments. Bugs: HIVE-10835 https://issues.apache.org/jira/browse/HIVE-10835 Repository: hive-git Description ------- There exist race conditions between DatabaseMetaData, Statement and ResultSet when they make RPC calls to HS2 using same Thrift transport, which happens within same connection. The patch is to have a connection level lock to serialize the RPC calls within a single connection. Diffs (updated) ----- jdbc/src/java/org/apache/hive/jdbc/HiveConnection.java 1b2891b jdbc/src/java/org/apache/hive/jdbc/HiveQueryResultSet.java e93795a jdbc/src/java/org/apache/hive/jdbc/HiveStatement.java 6b3d05c Diff: https://reviews.apache.org/r/34727/diff/ Testing (updated) ------- Some multi-thread tests (80 threads for 200 iterations) Thanks, Chaoyu Tang