rep002.tcl

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# See the file LICENSE for redistribution information.
#
# Copyright (c) 2002
#	Sleepycat Software.  All rights reserved.
#
# $Id: rep002.tcl,v 11.11 2002/08/08 18:13:12 sue Exp $
#
# TEST  rep002
# TEST	Basic replication election test.
# TEST
# TEST	Run a modified version of test001 in a replicated master environment;
# TEST  hold an election among a group of clients to make sure they select
# TEST  a proper master from amongst themselves, in various scenarios.

proc rep002 { method { niter 10 } { nclients 3 } { tnum "02" } args } {
	source ./include.tcl
	global elect_timeout

	set elect_timeout 1000000

	if { [is_record_based $method] == 1 } {
		puts "Rep002: Skipping for method $method."
		return
	}

	env_cleanup $testdir

	set qdir $testdir/MSGQUEUEDIR
	replsetup $qdir

	set masterdir $testdir/MASTERDIR
	file mkdir $masterdir

	for { set i 0 } { $i < $nclients } { incr i } {
		set clientdir($i) $testdir/CLIENTDIR.$i
		file mkdir $clientdir($i)
	}

	puts "Rep0$tnum: Replication election test with $nclients clients."

	# Open a master.
	repladd 1
	set env_cmd(M) "berkdb_env -create -log_max 1000000 -home \
	    $masterdir -txn -rep_master -rep_transport \[list 1 replsend\]"
	set masterenv [eval $env_cmd(M)]
	error_check_good master_env [is_valid_env $masterenv] TRUE

	# Open the clients.
	for { set i 0 } { $i < $nclients } { incr i } {
		set envid [expr $i + 2]
		repladd $envid
		set env_cmd($i) "berkdb_env -create -home $clientdir($i) \
		    -txn -rep_client -rep_transport \[list $envid replsend\]"
		set clientenv($i) [eval $env_cmd($i)]
		error_check_good \
		    client_env($i) [is_valid_env $clientenv($i)] TRUE
	}

	# Run a modified test001 in the master.
	puts "\tRep0$tnum.a: Running test001 in replicated env."
	eval test001 $method $niter 0 $tnum 0 -env $masterenv $args

	# Loop, processing first the master's messages, then the client's,
	# until both queues are empty.
	while { 1 } {
		set nproced 0

		incr nproced [replprocessqueue $masterenv 1]

		for { set i 0 } { $i < $nclients } { incr i } { 	
			set envid [expr $i + 2]
			incr nproced [replprocessqueue $clientenv($i) $envid]
		}

		if { $nproced == 0 } {
			break
		}
	}

	# Verify the database in the client dir.
	for { set i 0 } { $i < $nclients } { incr i } {
		puts "\tRep0$tnum.b: Verifying contents of client database $i."
		set testdir [get_home $masterenv]
		set t1 $testdir/t1
		set t2 $testdir/t2
		set t3 $testdir/t3
		open_and_dump_file test0$tnum.db $clientenv($i) $testdir/t1 \
	    	    test001.check dump_file_direction "-first" "-next"

		if { [string compare [convert_method $method] -recno] != 0 } {
			filesort $t1 $t3
		}
		error_check_good diff_files($t2,$t3) [filecmp $t2 $t3] 0

		verify_dir $clientdir($i) "\tRep0$tnum.c: " 0 0 1
	}

	# Start an election in the first client.
	puts "\tRep0$tnum.d: Starting election without dead master."

	set elect_pipe(0) [start_election \
	    $qdir $env_cmd(0) [expr $nclients + 1] 20 $elect_timeout]

	tclsleep 1

	# We want to verify all the clients but the one that declared an 
	# election get the election message.
	# We also want to verify that the master declares the election
	# over by fiat, even if everyone uses a lower priority than 20.
	# Loop and process all messages, keeping track of which 
	# sites got a HOLDELECTION and checking that the returned newmaster, 
	# if any, is 1 (the master's replication ID).
	set got_hold_elect(M) 0
	for { set i 0 } { $i < $nclients } { incr i } { 
		set got_hold_elect($i) 0 
	}
	while { 1 } {
		set nproced 0
		set he 0
		set nm 0
		

		incr nproced [replprocessqueue $masterenv 1 0 he nm]

		if { $he == 1 } {
			set elect_pipe(M) [start_election $qdir \
			    $env_cmd(M) [expr $nclients + 1] 0 $elect_timeout]
			set got_hold_elect(M) 1
		}
		if { $nm != 0 } {
			error_check_good newmaster_is_master $nm 1
		}

		for { set i 0 } { $i < $nclients } { incr i } { 	
			set he 0
			set envid [expr $i + 2]
			incr nproced \
			    [replprocessqueue $clientenv($i) $envid 0 he nm]
			if { $he == 1 } {
				# error_check_bad client(0)_in_elect $i 0
				set elect_pipe(M) [start_election $qdir \
			    	    $env_cmd($i) [expr $nclients + 1] 0 \
				    $elect_timeout]
				set got_hold_elect($i) 1
			}
			if { $nm != 0 } {
				error_check_good newmaster_is_master $nm 1
			}
		}

		if { $nproced == 0 } {
			break
		}
	}

	error_check_good got_hold_elect(master) $got_hold_elect(M) 0
	unset got_hold_elect(M)
	# error_check_good got_hold_elect(0) $got_hold_elect(0) 0
	unset got_hold_elect(0)
	for { set i 1 } { $i < $nclients } { incr i } { 
		error_check_good got_hold_elect($i) $got_hold_elect($i) 1
		unset got_hold_elect($i)
	}

	cleanup_elections

	# We need multiple clients to proceed from here.
	if { $nclients < 2 } {
		puts "\tRep0$tnum: Skipping for less than two clients."
		error_check_good masterenv_close [$masterenv close] 0
		for { set i 0 } { $i < $nclients } { incr i } {
			error_check_good clientenv_close($i) \
			    [$clientenv($i) close] 0
		}
		return
	}

	# Make sure all the clients are synced up and ready to be good
	# voting citizens.
	error_check_good master_flush [$masterenv rep_flush] 0
	while { 1 } {
		set nproced 0
		incr nproced [replprocessqueue $masterenv 1 0]
		for { set i 0 } { $i < $nclients } { incr i } {
			incr nproced [replprocessqueue $clientenv($i) \
			    [expr $i + 2] 0]
		}

		if { $nproced == 0 } {
			break
		}
	}

	# Now hold another election in the first client, this time with
	# a dead master.
	puts "\tRep0$tnum.e: Starting election with dead master."
	error_check_good masterenv_close [$masterenv close] 0

	for { set i 0 } { $i < $nclients } { incr i } {
		replclear [expr $i + 2]
	}

	set elect_pipe(0) [start_election \
	    $qdir $env_cmd(0) [expr $nclients + 1] 20 $elect_timeout]

	tclsleep 1

	# Process messages, and verify that the client with the highest
	# priority--client #1--wins.
	set got_newmaster 0
	set tries 10
	while { 1 } {
		set nproced 0
		set he 0
		set nm 0
		
		for { set i 0 } { $i < $nclients } { incr i } { 	
			set he 0
			set envid [expr $i + 2]
			incr nproced \
			    [replprocessqueue $clientenv($i) $envid 0 he nm]
			if { $he == 1 } {

				# Client #1 has priority 100;  everyone else
				# has priority 10.
				if { $i == 1 } {
					set pri 100
				} else {
					set pri 10
				}
				# error_check_bad client(0)_in_elect $i 0
				set elect_pipe(M) [start_election $qdir \
			    	    $env_cmd($i) [expr $nclients + 1] $pri \
				    $elect_timeout]
				set got_hold_elect($i) 1
			}
			if { $nm != 0 } {
				error_check_good newmaster_is_master $nm \
				    [expr 1 + 2]
				set got_newmaster $nm

				# If this env is the new master, it needs to
				# configure itself as such--this is a different
				# env handle from the one that performed the
				# election.
				if { $nm == $envid } {
					error_check_good make_master($i) \
					    [$clientenv($i) rep_start -master] \
					    0
				}
			}
		}

		# We need to wait around to make doubly sure that the
		# election has finished...
		if { $nproced == 0 } {
			incr tries -1
			if { $tries == 0 } {
				break
			} else {
				tclsleep 1
			}
		}
	}

	# Verify that client #1 is actually the winner.
	error_check_good "client 1 wins" $got_newmaster [expr 1 + 2]

	cleanup_elections

	for { set i 0 } { $i < $nclients } { incr i } {
		error_check_good clientenv_close($i) [$clientenv($i) close] 0
	}

	replclose $testdir/MSGQUEUEDIR
}

proc reptwo { args } { eval rep002 $args }