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154 lines
4.3 KiB
Plaintext
154 lines
4.3 KiB
Plaintext
OMQ version 3.1.0 (beta), released on 2011/12/18
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================================================
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General information
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-------------------
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Based on community consensus, the 0MQ 3.1.x release reverts a number of
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features introduced in version 3.0. The major reason for these changes is
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improving backward compatibility with 0MQ 2.1.x.
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Development of the 0MQ 3.0.x series will be discontinued, and users are
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encouraged to upgrade to 3.1.
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The 0MQ 3.1.x releases use ABI version 3.
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Reverted functionality
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----------------------
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The following functionality present in 0MQ 3.0 has been reverted:
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* Wire format changes. The 0MQ 3.1 wire format is identical to that of 0MQ
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2.1.
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* LABELs and COMMANDs have been removed.
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* Explicit identies are re-introduced, however they can be used only for
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explicit routing, not for durable sockets.
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* The ZMQ_ROUTER and ZMQ_DEALER socket types are once again aliases for
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ZMQ_XREQ and ZMQ_XREP.
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New functionality
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-----------------
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* The zmq_getmsgopt() function has been introduced.
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* Experimental IPv6 support has been introduced. This is disabled by
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default, see the zmq_setsockopt() documentation for enabling it.
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Other changes
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-------------
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* The default HWM for all socket types has been set to 1000.
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* Many bug fixes.
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Building
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--------
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* The dependency on libuuid has been removed.
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* Support for building on Android, and with MSVC 10 has been added.
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0MQ version 3.0.0 (alpha), released on 2011/07/12
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=================================================
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New functionality
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-----------------
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* POSIX-compliant zmq_send and zmq_recv introduced (uses raw buffer
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instead of message object).
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* ZMQ_MULTICAST_HOPS socket option added. Sets the appropriate field in
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IP headers of PGM packets.
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* Subscription forwarding. Instead of filtering on consumer, the
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subscription is moved as far as possible towards the publisher and
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filtering is done there.
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* ZMQ_XPUB, ZMQ_XSUB introduced. Allow to create subscription-
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forwarding-friendly intermediate devices.
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* Add sockopt ZMQ_RCVTIMEO/ZMQ_SNDTIMEO. Allow to set timeout for
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blocking send/recv calls.
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* A new LABEL flag was added to the wire format. The flag distinguishes
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message parts used by 0MQ (labels) from user payload message parts.
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* There is a new wire format for the REQ/REP pattern. First, the empty
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bottom-of-the-stack message part is not needed any more, the LABEL
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flag is used instead. Secondly, peer IDs are 32-bit integers rather
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than 17-byte UUIDs.
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* The REQ socket now drops duplicate replies.
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* Outstanding requests & replies associated with a client are dropped
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when the clients dies. This is a performance optimisation.
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* Introduced ZMQ_ROUTER and ZMQ_DEALER sockets. These mimic the
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functionality of ZMQ_ROUTER and ZMQ_DEALER in 0MQ/2.1.x. Guarantees
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backward compatibility for exsiting code.
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* Removed dependency on OS socketpair buffer size. No more asserts in
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mailbox.cpp because of low system limit of sockepair buffer size.
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API improvements
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----------------
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* Obsolete constants ZMQ_UPSTREAM and ZMQ_DOWNSTREAM removed. Use
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ZMQ_PUSH and ZMQ_PULL instead.
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* Timeout in zmq_poll is in milliseconds instead of microseconds. This
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makes zmq_poll() compliant with POSIX poll()
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* ZMQ_MCAST_LOOP removed. There's no support for multicast over
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loopback any more. Use IPC or TCP isntead.
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* zmq_send/zmq_recv was renamed zmq_sendmsg/zmq_recvmsg.
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* ZMQ_RECOVERY_IVL and ZMQ_RECOVERY_IVL_MSEC reconciled. The new option
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is named ZMQ_RECOVERY_IVL and the unit is milliseconds.
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* Option types changed. Most of the numeric types are now represented
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as 'int'.
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* ZMQ_HWM split into ZMQ_SNDHWM and ZMQ_RCVHWM. This makes it possible
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to control message flow separately for each direction.
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* ZMQ_NOBLOCK renamed ZMQ_DONTWAIT. That makes it POSIX-compliant.
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Less is More
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------------
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* Pre-built devices and zmq_device() removed. Should be made available
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as a separate project(s).
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* ZMQ_SWAP removed. Writing data to disk should be done on top of 0MQ,
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on inside it.
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* C++ binding removed from the core. Now it's a separate project, same
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as any other binding.
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Bug fixes
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---------
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* Many.
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Building
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--------
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* Make pkg-config dependency conditional.
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Distribution
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------------
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* Removed Debian packaging, which is now available at packages.debian.org
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or via apt-get.
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Older versions
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==============
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* See NEWS in ZeroMQ 2.1.x repository at http://github.com/zeromq/zeromq2-1.
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