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Subject [GitHub] [trafodion] selvaganesang opened a new pull request #1824: [TRAFODION-3280] Reduce path length in Trafodion for improved performance and scalability
Date Thu, 04 Apr 2019 23:43:19 GMT
selvaganesang opened a new pull request #1824: [TRAFODION-3280] Reduce path length in Trafodion
for improved performance and scalability 
   Removed/avoided the following APIs shown as hotspots when Trafodion is run with OLTP kind
of queries.
   Now waits for the network timeout. It can be configured via a property networkTimeout
or call to connection.setNetworkTimeout. If the networkTimeout is not configured, a default
value of 10 secs is assumed.
   The caller is expected to set the timeout depending upon the operation being performed
like loginTimeout, queryTimeout. will wake up for every networkTimeout expiration
and check if the timeout for the operation hasn't exceeded. When it exceeds, SocketTimeoutException
is thrown.
   Changed the T4Statement and T4Restult classes to have "has a" relationship with T4Connection
for better understanding of the code. Earlier, it had "is a" relationship with T4Connection.
   JDBC driver was parsing the sql string passed to it by the application to determine the
type of SQL statement and to check if the sql string has parameters. It doesn't parse the
sql string anymore
   and passes the sql string to SQL engine via mxosrvr. In case of PreparedStatement, the
JDBC driver will
   set the sqlStmtType based on the query type returned. In case of Statement, the JDBC driver
will set the
   sqlStmtType as SQL_TYPE_UNKNOWN.
   Now, the PreparedStatement is always prepared for setting array values for parameter for
   statement types such as IUD and select. SQL engine will report an error if the array values
   not supported for any statement type.
   Changed Hashtable to HashMap where possible with the assumption that the JDBC connection
   shouldn't be used from different threads. TrafT4Connection object needs be made thread-safe.
   Optimized org.trafodion.jdbc.t4.TrafT4ResultSet.findColumn by using HashMap of columnName
   columnIndex. This should avoid excessive calls to java.lang.String.equalsIgnoreCase.
   Removed excessive calls to java.lang.Class.getMethod from TrafT4ResultSet.
   When the statement type is TYPE_UNKNOWN, mxosrvr was executing the extra code
   to load controls, GetHashInfo etc. GetHashInfo was corrupting the sqlString by
   truncating spaces in between the literals. Removed these code from mxosrvr because it is
specific to QueryStatsServer as part of NeoView and WMS.
   There are many places in our code getenv is called repeatedly. Cleaned up code so that
   repeated getenv calls are avoided during prepare and execute operations.

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