// until the state files merging utility is ready, the function is not really
// interesting, it selects 0 as the next gid each time
void
ReplicatorStateMachine::gidSelectionHandler( )
{
REPLICATION_ASSERT( m_state == BACKUP || m_state == REPLICATION_LEADER );
dprintf( D_ALWAYS, "ReplicatorStateMachine::gidSelectionHandler started\n");
bool areVersionsComparable = true;
List<Version> actualVersionsList;
Version actualVersion;
utilCopyList( actualVersionsList, m_versionsList );
while( actualVersionsList.Next( actualVersion ) ) {
if( ! m_myVersion.isComparable( actualVersion ) ) {
areVersionsComparable = false;
break;
}
}
actualVersionsList.Rewind( );
if( areVersionsComparable ) {
dprintf( D_ALWAYS, "ReplicatorStateMachine::gidSelectionHandler no "
"need to select new gid\n" );
return ;
}
int temporaryGid = 0;
while( ( temporaryGid = rand( ) ) == m_myVersion.getGid( ) ) { }
m_myVersion.setGid( temporaryGid );
dprintf( D_ALWAYS, "ReplicatorStateMachine::gidSelectionHandler "
"new gid selected: %d\n", temporaryGid );
//myVersion.setSinfulString( daemonCore->InfoCommandSinfulString( ) );
}
// creating downloading transferer process and remembering its pid and creation
// time
bool
AbstractReplicatorStateMachine::download( const char* daemonSinfulString )
{
ArgList processArguments;
processArguments.AppendArg( m_transfererPath.Value() );
processArguments.AppendArg( "-f" );
processArguments.AppendArg( "down" );
processArguments.AppendArg( daemonSinfulString );
processArguments.AppendArg( m_versionFilePath.Value() );
processArguments.AppendArg( "1" );
processArguments.AppendArg( m_stateFilePath.Value() );
// Get arguments from this ArgList object for descriptional purposes.
MyString s;
processArguments.GetArgsStringForDisplay( &s );
dprintf( D_FULLDEBUG,
"AbstractReplicatorStateMachine::download creating "
"downloading condor_transferer process: \n \"%s\"\n",
s.Value( ) );
// PRIV_ROOT privilege is necessary here to create the process
// so we can read GSI certs <sigh>
priv_state privilege = PRIV_ROOT;
int transfererPid = daemonCore->Create_Process(
m_transfererPath.Value( ), // name
processArguments, // args
privilege, // priv
m_downloadReaperId, // reaper id
FALSE, // command port needed?
FALSE, // command port needed?
NULL, // env
NULL, // cwd
NULL // process family info
);
if( transfererPid == FALSE ) {
dprintf( D_ALWAYS,
"AbstractReplicatorStateMachine::download unable to create "
"downloading condor_transferer process\n" );
return false;
} else {
dprintf( D_FULLDEBUG,
"AbstractReplicatorStateMachine::download downloading "
"condor_transferer process created with pid = %d\n",
transfererPid );
REPLICATION_ASSERT( ! m_downloadTransfererMetadata.isValid() );
/* Remembering the last time, when the downloading 'condor_transferer'
* was created: the monitoring might be useful in possible prevention
* of stuck 'condor_transferer' processes. Remembering the pid of the
* downloading process as well: to terminate it when the downloading
* process is stuck
*/
m_downloadTransfererMetadata.set(transfererPid, time( NULL ) );
}
return true;
}
void
ReplicatorStateMachine::afterElectionStateHandler()
{
dprintf( D_ALWAYS, "ReplicatorStateMachine::afterElectionStateHandler "
"started\n" );
REPLICATION_ASSERT(m_state != REPLICATION_LEADER);
// we stay in VERSION_REQUESTING or VERSION_DOWNLOADING state
// of newly joining node, we will go to LEADER_STATE later
// upon receiving of IN_LEADER message from HAD
if( m_state == VERSION_REQUESTING || m_state == VERSION_DOWNLOADING ) {
return ;
}
becomeLeader( );
}
// sends the version of the last execution time to all the replication daemons,
// then asks the pool replication daemons to send their own versions to it,
// sets a timer to wait till the versions are received
void
ReplicatorStateMachine::beforePassiveStateHandler()
{
REPLICATION_ASSERT(m_state == VERSION_REQUESTING);
dprintf( D_ALWAYS,
"ReplicatorStateMachine::beforePassiveStateHandler started\n" );
broadcastVersion( REPLICATION_NEWLY_JOINED_VERSION );
requestVersions( );
dprintf( D_FULLDEBUG, "ReplicatorStateMachine::beforePassiveStateHandler "
"registering version requesting timer\n" );
m_versionRequestingTimerId = daemonCore->Register_Timer(
m_newlyJoinedWaitingVersionInterval,
(TimerHandlercpp) &ReplicatorStateMachine::versionRequestingTimer,
"Time to pass to VERSION_DOWNLOADING state", this );
}
bool
ReplicatorStateMachine::replicaSelectionHandler( Version& newVersion )
{
REPLICATION_ASSERT( m_state == VERSION_DOWNLOADING || m_state == BACKUP );
dprintf( D_ALWAYS, "ReplicatorStateMachine::replicaSelectionHandler "
"started with my version = %s, #versions = %d\n",
m_myVersion.toString( ).Value( ), m_versionsList.Number( ) );
List<Version> actualVersionsList;
Version myVersionCopy = m_myVersion;
utilCopyList( actualVersionsList, m_versionsList );
// in BACKUP state compares the received version with the local one
if( m_state == BACKUP ) {
// compares the versions, taking only 'gid' and 'logicalClock' into
// account - this is the reason for making the states equal
myVersionCopy.setState( newVersion );
return ! newVersion.isComparable( myVersionCopy ) ||
newVersion > myVersionCopy;
}
/* in VERSION_DOWNLOADING state selecting the best version from the list of
* received versions according to the policy defined by
* 'replicaSelectionHandler', i.e. selecting the version with greatest
* 'logicalClock' value amongst a group of versions with the same gid
*/
actualVersionsList.Rewind( );
if( actualVersionsList.IsEmpty( ) ) {
return false;
}
Version version;
Version bestVersion;
// taking the first actual version as the best version in the meantime
actualVersionsList.Next( bestVersion );
dprintf( D_ALWAYS, "ReplicatorStateMachine::replicaSelectionHandler best "
"version = %s\n", bestVersion.toString( ).Value( ) );
while( actualVersionsList.Next( version ) ) {
dprintf( D_ALWAYS, "ReplicatorStateMachine::replicaSelectionHandler "
"actual version = %s\n", version.toString( ).Value( ) );
if( version.isComparable( bestVersion ) && version > bestVersion ) {
bestVersion = version;
}
}
actualVersionsList.Rewind( );
// compares the versions, taking only 'gid' and 'logicalClock' into
// account - this is the reason for making the states equal
myVersionCopy.setState( bestVersion );
// either when the versions are incomparable or when the local version
// is worse, the remote version must be downloaded
if( myVersionCopy.isComparable( bestVersion ) &&
myVersionCopy >= bestVersion ) {
return false;
}
newVersion = bestVersion;
dprintf( D_ALWAYS, "ReplicatorStateMachine::replicaSelectionHandler "
"best version selected: %s\n", newVersion.toString().Value());
return true;
}
