For ENG-6333, first version of latency watchdog.
For ENG-6333, use java thread instead of voltDB scheduleWork thread,
insert latency inspection points in network threads and ExecutionEngine
thread.
For ENG-6333, 2nd version of latency watchdog.
For ENG-6333, add logging rate limiter in latency watchdog.
For ENG-6333, change latency spike monitor points to see if latency
watchdog works.
For ENG-6333, add more latency spike inspection points.
For ENG-6333, replace System.out.println with VoltLogger.
For ENG-6333, run() method of latency watchdog should be sychronized.
For ENG-6333, use ConcurrentHashMap instead of HashMap.
Temporarily check in the subquery cross level partitioning detecting work. Still need work for edge cases
Fix the alias partition detecting problem. Add the support for promoting sp info from subquery to parent level
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-6259-subselect-final
ENG-6300 use persistent sequential nodes for truncation snapshot requests
For ENG-6333, use linked hash map to record timestamp per thread.
Fix the subquery hsql generated table name SYSTEM_SUBQUERY, replace it with table alias; Add partitioning detecting for single partition subquery without selecting the partition column in is display list; Add more planner tests for subquery
Add check in ProcedureRunner that gracefully rejects all transactions that fail due to missing class error.

Added new environment variables called __VOLTDB_CLUSTER_HOSTID__ and __VOLTDB_TARGET_CLUSTER_HOSTID__ that can be assigned through LocalCluster and the environment variables passed to the constructor of LocalCluster. These environment variables allow you to explicitly identify a specific HostId that should behave differently or "*" for all hosts to behave identically.
ENG-6036 timestamp value as strings
Add regression suit tests for subquery partitioning cases
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-6259-subselect-final
Merge pull request #1374 from VoltDB/ENG-6300-II

ENG-6300 use persistent sequential nodes for truncation snapshot requests