Binary compatibility report for the mongoDB library between 2.2.1 and 2.2.2 versions on x86

Test Info

Library Name	mongoDB
Version #1	2.2.1
Version #2	2.2.2
CPU Type	x86
GCC Version	4.6.1

Test Results

Total Header Files	1
Total Shared Libraries	1
Total Symbols / Types	706 / 486
Verdict	Incompatible (16.9%)

Problem Summary

	Severity	Count
Added Symbols	-	4
Removed Symbols	High	2
Problems with Data Types	High	4
	Medium	3
	Low	0
Problems with Symbols	High	2
	Medium	0
	Low	0
Problems with Constants	Low	0

Added Symbols (4)

dbclient_rs.h, libmongoclient.so
namespace mongo
ReplicaSetMonitor::isAnyNodeOk ( ) const
ReplicaSetMonitor::selectAndCheckNode ( ReadPreference preference, TagSet* tags, bool* isPrimarySelected )
ReplicaSetMonitor::selectNode ( std::vector<ReplicaSetMonitor::Node>const& nodes, ReadPreference preference, TagSet* tags, int localThresholdMillis, HostAndPort* lastHost, bool* isPrimarySelected ) [static]

dbclientinterface.h, libmongoclient.so
namespace mongo
DBClientBase::ConnectionIdSequence [data]

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Removed Symbols (2)

dbclient_rs.h, libmongoclient.so
namespace mongo
ReplicaSetMonitor::selectAndCheckNode ( ReadPreference preference, TagSet* tags )
ReplicaSetMonitor::selectNode ( std::vector<ReplicaSetMonitor::Node>const& nodes, ReadPreference preference, TagSet* tags, int localThresholdMillis, HostAndPort* lastHost ) [static]

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Problems with Data Types, High Severity (4)

	Change	Effect
1	Size of this class has been increased from 152 bytes to 168 bytes.	1) An object of this class can be allocated by the applications and old size will be hardcoded at the compile time. Call of any exported constructor will break the memory of neighbouring objects on the stack or heap. 2) The memory layout and size of subclasses will be changed.

	Change	Effect
1	Size of this class has been changed from 76 bytes to 84 bytes.	1) The class has only inline or auto-generated constructors which will be copied to applications at compile time and will allocate an older memory layout. Call of any exported method of this class may access a memory outside the allocated objects or inside the older memory structure and result in crash or incorrect behavior of applications. 2) The memory layout and size of subclasses will be changed.

	Change	Effect
1	Size of this class has been changed from 140 bytes to 148 bytes.	1) The class has only inline or auto-generated constructors which will be copied to applications at compile time and will allocate an older memory layout. Call of any exported method of this class may access a memory outside the allocated objects or inside the older memory structure and result in crash or incorrect behavior of applications. 2) The memory layout and size of subclasses will be changed.

	Change	Effect
1	Size of this class has been increased from 156 bytes to 164 bytes.	1) An object of this class can be allocated by the applications and old size will be hardcoded at the compile time. Call of any exported constructor will break the memory of neighbouring objects on the stack or heap. 2) The memory layout and size of subclasses will be changed.

dbclient_rs.h
namespace mongo
[+] class DBClientReplicaSet (1)

dbclientinterface.h
namespace mongo
[+] class DBClientBase (1)
[+] class DBClientConnection (1)

syncclusterconnection.h
namespace mongo
[+] class SyncClusterConnection (1)

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Problems with Symbols, High Severity (2)

	Change	Effect
1	Parameters list has been changed.	The name of the appropriate symbol for this function on binary level has been changed from _ZN5mongo17ReplicaSetMonitor18selectAndCheckNodeENS_14ReadPreferenceEPNS_6TagSetE to _ZN5mongo17ReplicaSetMonitor18selectAndCheckNodeENS_14ReadPreferenceEPNS_6TagSetEPb. This may cause "undefined reference" linker error in old client applications.

	Change	Effect
1	Parameters list has been changed.	The name of the appropriate symbol for this function on binary level has been changed from _ZN5mongo17ReplicaSetMonitor10selectNodeERKSt6vectorINS0_4NodeESaIS2_EENS_14ReadPreferenceEPNS_6TagSetEiPNS_11HostAndPortE to _ZN5mongo17ReplicaSetMonitor10selectNodeERKSt6vectorINS0_4NodeESaIS2_EENS_14ReadPreferenceEPNS_6TagSetEiPNS_11HostAndPortEPb. This may cause "undefined reference" linker error in old client applications.

dbclient_rs.h, libmongoclient.so
namespace mongo
[+] ReplicaSetMonitor::selectAndCheckNode ( ReadPreference preference, TagSet* tags ) (1)
[+] ReplicaSetMonitor::selectNode ( std::vector<ReplicaSetMonitor::Node>const& nodes, ReadPreference preference, TagSet* tags, int localThresholdMillis, HostAndPort* lastHost ) [static] (1)

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Problems with Data Types, Medium Severity (3)

	Change	Effect
1	Type of field _lastSlaveOkConn has been changed from boost::scoped_ptr<DBClientConnection> (4 bytes) to boost::shared_ptr<DBClientConnection> (8 bytes).	1) Size of the inclusive type has been changed. 2) Previous accesses of applications and library functions to the fields at higher positions of the structure definition may be broken.
2	Type of field _master has been changed from boost::scoped_ptr<DBClientConnection> (4 bytes) to boost::shared_ptr<DBClientConnection> (8 bytes).	1) Size of the inclusive type has been changed. 2) Previous accesses of applications and library functions to the fields at higher positions of the structure definition may be broken.

	Change	Effect
1	Field _connectionId has been added at the middle position of this structural type.	1) Size of the inclusive type has been changed. 2) Layout of structure fields has been changed and therefore fields at higher positions of the structure definition may be incorrectly accessed by applications.

dbclient_rs.h
namespace mongo
[+] class DBClientReplicaSet (2)

dbclientinterface.h
namespace mongo
[+] class DBClientBase (1)

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Header Files (1)

dbclient.h

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Shared Libraries (1)

libmongoclient.so

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