It's that time again, thinking about the next release of ZK. From what
I'm hearing people seem interested in improving scalability,
manageability, and continue to improve client support.
In particular I believe we should look at the following going forward.
Of course ZooKeeper is open to submissions in that aren't on this list.
If you have any suggestions please feel free to enter a JIRA, submit a
patch, or comment on this thread.
http://wiki.apache.org/hadoop/ZooKeeper/HowToContribute
3.3 (~4 months out)
Observer support - ZOOKEEPER-368
Allow dynamic changes to ensemble w/o requiring restart - ZOOKEEPER-107
Move from direct NIO to framework (grizzly?)
benefit of built-in ssl support for connections
optimize session tracking
no expiration of session if client has no ephemerals
huge scalability win if we can do this (for a very common use case)
hide connection loss from client - ZOOKEEPER-22
optimize server
profiling for hotspots
replace String use with binary buffer - elim conversion overhead
(server only)
expand system tests
ensure b/w compat between current and previous version
move some unit tests into system test framework (esp large quorum
tests)
integrate performance/benchmark tests
cleanup the c binding
logging and general code cleanliness
review jmx object naming scheme
error handling, general cruft
move examples out of docs into contrib/examples (like hadoop core)
add more examples
build changes
ivy? push jars to maven repo?
split jars? common, server, client, test
horizontally partitioned zk
support multiple client protocols/marshalling
(hadoop rpc?)
AVRO is in the process of it's first release
quota support for limiting (rather than just reporting)
4.0 "API/data breakage release" (q1 2010)
API changes
move all "counter" fields from int -> long (version numbers for
example)
requires migration of snapshots (ie persistence/marshalling will
change)
pass enums to callbacks
remove deprecated cruft
bookeeper more tightly integrated into zk?
Feel free to respond to this email with any thoughts, suggestions, etc...
Regards,
Patrick
