The code in bmcdiscover do not close socket pair correctly which
causes `Too many open files` error from system. This commit maintains
a hash map to locate the file descriptors for child processes, close
these files when the child processes exit.
fix-issue: #3682
This patch add trace log for the db access. Currently support
5 log levels:
- 0: disable the trace log for db.
- 1: trace the calls of database subroutines.
- 2: trace the event to build the cache for the table
- 3: trace the event with cache hit
- 4: trace the SQL statement
implement-feature: #3612
Output example from xcat/cluster.log:
···
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"table":"site","method":"xCAT::Table::setAttribs"},"type":"end","elapsed":"0.00176s"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"table":"site","method":"xCAT::Table::setAttribs"},"type":"start"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"addon":"SELECT * FROM site WHERE \"value\" = ? AND \"comments\" = ? AND \"disable\" = ? AND \"key\" = ?","table":"site","method":"xCAT::Table::setAttribs"},"type":"start_sql"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"table":"site","method":"xCAT::Table::setAttribs"},"type":"end_sql","elapsed":"0.00043s"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"addon":"INSERT INTO site (\"value\",\"comments\",\"key\",\"disable\") VALUES (?,?,?,?)","table":"site","method":"xCAT::Table::setAttribs"},"type":"start_sql"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"addon":"INSERT INTO site (\"value\",\"comments\",\"key\",\"disable\") VALUES (?,?,?,?)","table":"site","method":"xCAT::Table::setAttribs"},"type":"end_sql","elapsed":"0.00043s"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"table":"site","method":"xCAT::Table::setAttribs"},"type":"end","elapsed":"0.00171s"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"table":"site","method":"xCAT::Table::getAttribs"},"type":"start"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"addon":"SELECT * FROM site WHERE \"key\" = ? and (\"disable\" is NULL or \"disable\" in ('0','no','NO','No','nO'))","table":"site","method":"xCAT::Table::getAttribs"},"type":"start_sql"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"table":"site","method":"xCAT::Table::getAttribs"},"type":"end_sql","elapsed":"0.00061s"}
Aug 9 01:59:15 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"table":"site","method":"xCAT::Table::getAttribs"},"type":"end","elapsed":"0.00125s"}
Aug 9 01:59:19 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"table":"site","method":"xCAT::Table::getAllAttribs"},"type":"start"}
Aug 9 01:59:19 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"addon":"SELECT * FROM site WHERE \"disable\" is NULL or \"disable\" in ('0','no','NO','No','nO')","table":"site","method":"xCAT::Table::getAllAttribs"},"type":"start_sql"}
Aug 9 01:59:19 c910f05c01bc02k74 xcat[694]: [DB Trace]: {"msg":{"addon":"SELECT * FROM site WHERE \"disable\" is NULL or \"disable\" in ('0','no','NO','No','nO')","table":"site","method":"xCAT::Table::getAllAttribs"},"type":"end_sql","elapsed":"0.00080s"}
···
