I've posted the first release candidate here: http://people.apache.org/~cmccabe/htrace/releases/4.0.0/rc0
The jars have been staged here: https://repository.apache.org/content/repositories/orgapachehtrace-1017 There's a lot of great stuff in this release, including a new web UI, many bug fixes, API improvements and enlargement of span IDs to 128 bits to avoid conflicts. The vote will run for 5 days. cheers, Colin Release Notes - HTrace - Version 4.0 ** Sub-task * [HTRACE-208] - Remove deprecated addKVAnnotation(byte[], byte[]) method * [HTRACE-209] - Make span ID 128 bit to avoid collisions * [HTRACE-210] - Remove TrueIfTracingSampler * [HTRACE-211] - Move htrace-core classes to the org.apache.htrace.core namespace * [HTRACE-212] - Change version to 4.0 * [HTRACE-214] - De-globalize Tracer.java * [HTRACE-215] - Simplify the Sampler type * [HTRACE-216] - SpanReceivers should not fill in ProcessId * [HTRACE-217] - Rename ProcessId to TracerId * [HTRACE-222] - Add SpanReceiverPool * [HTRACE-228] - Fix subprojects to refer to new org.apache.htrace.core namespace * [HTRACE-229] - htrace-webapp needs to be updated to refer to "tracerid" not "processid" ** Bug * [HTRACE-159] - libhtrace.so: use HRPC endpoint of htraced * [HTRACE-164] - htrace hrpc: use msgpack for serialization * [HTRACE-166] - Add tabbed view * [HTRACE-167] - Update go build instructions in BUILDING.txt * [HTRACE-171] - htraced godeps should use github.com/ugorji/go/codec rather than github.com/ugorji/go * [HTRACE-174] - Refactor GUI * [HTRACE-177] - htrace-zipkin: shade all dependencies * [HTRACE-182] - htraced: add rpm build via -Prpm * [HTRACE-189] - gui: fix error handling in a few places * [HTRACE-190] - htraced: allow querying by process ID * [HTRACE-191] - gui: add "duration" to span details, filter out "selected" * [HTRACE-192] - gui: when expanding parents or children, sort the spans by begin time * [HTRACE-193] - gui: avoid doing multiple redraws when spanResults is updated * [HTRACE-196] - gui: add scrolling for spans view * [HTRACE-201] - htrace-web: URL-Encode query JSON * [HTRACE-202] - htrace-web: fix "converting circular object to JSON" error when pressing "clear" button * [HTRACE-218] - Fix issues with finding json-c includes and librt in the native library * [HTRACE-219] - Add -Dleveldb.prefix and -Djsonc.prefix build options * [HTRACE-220] - htraced: should be able to set log.path to the empty string via "-Dlog.path=" on the command line * [HTRACE-223] - gobuild.sh: fix issue where maven succeeds if go build fails * [HTRACE-224] - htrace C client: htrace_conf_get_u64, htrace_conf_get_double can't handle spaces at the end of strings * [HTRACE-230] - Make TracerBuilder like all other Builders; an internal rather than adjacent class * [HTRACE-233] - htrace-zipkin should explicitly include slf4j-api to avoid ClassNotFoundException * [HTRACE-234] - Add workaround to prevent htrace-hbase from getting in an infinite loop while creating the dependency-reduced pom ** Improvement * [HTRACE-29] - add javascript web UI for htraced * [HTRACE-160] - htraced: support continuing a query from where the client left it off by sending a previous span * [HTRACE-162] - htraced hrpc: some logging improvements * [HTRACE-170] - Optimize use of Random in htrace-core by using ThreadLocalRandom * [HTRACE-172] - Move minJdk to 1.7 (JDK 7) * [HTRACE-175] - Add Trace#addKVAnnotation convenience method * [HTRACE-176] - Expose ZipkinSpanReceiver configuration keys externally * [HTRACE-180] - Move the GUI to a top-level subproject * [HTRACE-184] - Expose PROCESS_ID_KEY configuration key * [HTRACE-186] - gui: support finding the parents and children of spans, add owl * [HTRACE-194] - gui: support multiple selections, zooming to fit a group of spans, deleting a group of spans * [HTRACE-197] - htraced build: set RUNPATH if possible * [HTRACE-199] - gui: Double clicking on spans should bring up span details * [HTRACE-203] - htrace-web: pressing enter should dismiss the modal dialog box * [HTRACE-204] - htrace-web: add draggable bar which allows more or less visual space for process name in search view * [HTRACE-205] - htrace-web: Width of SearchResultsView should be uppdated along with resizing of browser window * [HTRACE-206] - htrace-web: when the canvas has focus, the delete key should clear, z key should zoom * [HTRACE-221] - htraced: search /etc/htraced/conf for the htraced configuration by default * [HTRACE-227] - Remove dependency to non-public API of hadoop-common from htrace-hbase ** New Feature * [HTRACE-143] - htraced search GUI enhancements ** Task * [HTRACE-183] - htraced: move src/go directory to go ** Test * [HTRACE-213] - Add test for ZipkinSpanReceiver