From 483eb2f56657e8e7f419ab1a4fab8dce9ade8609 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 20:24:20 +0200 Subject: Adding upstream version 14.2.21. Signed-off-by: Daniel Baumann --- doc/dev/blkin.rst | 169 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 169 insertions(+) create mode 100644 doc/dev/blkin.rst (limited to 'doc/dev/blkin.rst') diff --git a/doc/dev/blkin.rst b/doc/dev/blkin.rst new file mode 100644 index 00000000..574ae802 --- /dev/null +++ b/doc/dev/blkin.rst @@ -0,0 +1,169 @@ +========================= + Tracing Ceph With Blkin +========================= + +Ceph can use Blkin, a library created by Marios Kogias and others, +which enables tracking a specific request from the time it enters +the system at higher levels till it is finally served by RADOS. + +In general, Blkin implements the Dapper_ tracing semantics +in order to show the causal relationships between the different +processing phases that an IO request may trigger. The goal is an +end-to-end visualisation of the request's route in the system, +accompanied by information concerning latencies in each processing +phase. Thanks to LTTng this can happen with a minimal overhead and +in realtime. The LTTng traces can then be visualized with Twitter's +Zipkin_. + +.. _Dapper: http://static.googleusercontent.com/media/research.google.com/el//pubs/archive/36356.pdf +.. _Zipkin: https://zipkin.io/ + + +Installing Blkin +================ + +You can install Markos Kogias' upstream Blkin_ by hand.:: + + cd blkin/ + make && make install + +or build distribution packages using DistroReadyBlkin_, which also comes with +pkgconfig support. If you choose the latter, then you must generate the +configure and make files first.:: + + cd blkin + autoreconf -i + +.. _Blkin: https://github.com/marioskogias/blkin +.. _DistroReadyBlkin: https://github.com/agshew/blkin + + +Configuring Ceph with Blkin +=========================== + +If you built and installed Blkin by hand, rather than building and +installing packages, then set these variables before configuring +Ceph.:: + + export BLKIN_CFLAGS=-Iblkin/ + export BLKIN_LIBS=-lzipkin-cpp + +Blkin support in Ceph is disabled by default, so you may +want to configure with something like:: + + ./do_cmake -DWITH_BLKIN=ON + +Config option for blkin must be set to true in ceph.conf to get +traces from rbd through OSDC and OSD:: + + rbd_blkin_trace_all = true + + +Testing Blkin +============= + +It's easy to test Ceph's Blkin tracing. Let's assume you don't have +Ceph already running, and you compiled Ceph with Blkin support but +you didn't install it. Then launch Ceph with the ``vstart.sh`` script +in Ceph's src directory so you can see the possible tracepoints.:: + + cd src + OSD=3 MON=3 RGW=1 ./vstart.sh -n + lttng list --userspace + +You'll see something like the following::: + + UST events: + ------------- + PID: 8987 - Name: ./ceph-osd + zipkin:timestamp (loglevel: TRACE_WARNING (4)) (type: tracepoint) + zipkin:keyval_integer (loglevel: TRACE_WARNING (4)) (type: tracepoint) + zipkin:keyval_string (loglevel: TRACE_WARNING (4)) (type: tracepoint) + lttng_ust_tracelog:TRACE_DEBUG (loglevel: TRACE_DEBUG (14)) (type: tracepoint) + + PID: 8407 - Name: ./ceph-mon + zipkin:timestamp (loglevel: TRACE_WARNING (4)) (type: tracepoint) + zipkin:keyval_integer (loglevel: TRACE_WARNING (4)) (type: tracepoint) + zipkin:keyval_string (loglevel: TRACE_WARNING (4)) (type: tracepoint) + lttng_ust_tracelog:TRACE_DEBUG (loglevel: TRACE_DEBUG (14)) (type: tracepoint) + + ... + +Next, stop Ceph so that the tracepoints can be enabled.:: + + ./stop.sh + +Start up an LTTng session and enable the tracepoints.:: + + lttng create blkin-test + lttng enable-event --userspace zipkin:timestamp + lttng enable-event --userspace zipkin:keyval_integer + lttng enable-event --userspace zipkin:keyval_string + lttng start + +Then start up Ceph again.:: + + OSD=3 MON=3 RGW=1 ./vstart.sh -n + +You may want to check that ceph is up.:: + + ./ceph status + +Now put something in using rados, check that it made it, get it back, and remove it.:: + + ./ceph osd pool create test-blkin 8 + ./rados put test-object-1 ./vstart.sh --pool=test-blkin + ./rados -p test-blkin ls + ./ceph osd map test-blkin test-object-1 + ./rados get test-object-1 ./vstart-copy.sh --pool=test-blkin + md5sum vstart* + ./rados rm test-object-1 --pool=test-blkin + +You could also use the example in ``examples/librados/`` or ``rados bench``. + +Then stop the LTTng session and see what was collected.:: + + lttng stop + lttng view + +You'll see something like::: + + [15:33:08.884275486] (+0.000225472) ubuntu zipkin:timestamp: { cpu_id = 53 }, { trace_name = "op", service_name = "Objecter", port_no = 0, ip = "0.0.0.0", trace_id = 5485970765435202833, span_id = 5485970765435202833, parent_span_id = 0, event = "osd op reply" } + [15:33:08.884614135] (+0.000002839) ubuntu zipkin:keyval_integer: { cpu_id = 10 }, { trace_name = "", service_name = "Messenger", port_no = 6805, ip = "0.0.0.0", trace_id = 7381732770245808782, span_id = 7387710183742669839, parent_span_id = 1205040135881905799, key = "tid", val = 2 } + [15:33:08.884616431] (+0.000002296) ubuntu zipkin:keyval_string: { cpu_id = 10 }, { trace_name = "", service_name = "Messenger", port_no = 6805, ip = "0.0.0.0", trace_id = 7381732770245808782, span_id = 7387710183742669839, parent_span_id = 1205040135881905799, key = "entity type", val = "client" } + + +Install Zipkin +=============== +One of the points of using Blkin is so that you can look at the traces +using Zipkin. Users should run Zipkin as a tracepoints collector and +also a web service. The executable jar runs a collector on port 9410 and +the web interface on port 9411 + +Download Zipkin Package:: + + git clone https://github.com/openzipkin/zipkin && cd zipkin + wget -O zipkin.jar 'https://search.maven.org/remote_content?g=io.zipkin.java&a=zipkin-server&v=LATEST&c=exec' + java -jar zipkin.jar + + +Show Ceph's Blkin Traces in Zipkin-web +====================================== +Download babeltrace-zipkin project. This project takes the traces +generated with blkin and sends them to a Zipkin collector using scribe:: + + git clone https://github.com/vears91/babeltrace-zipkin + cd babeltrace-zipkin + +Send lttng data to Zipkin:: + + python3 babeltrace_zipkin.py ${lttng-traces-dir}/${blkin-test}/ust/uid/0/64-bit/ -p ${zipkin-collector-port(9410 by default)} -s ${zipkin-collector-ip} + +Example:: + + python3 babeltrace_zipkin.py ~/lttng-traces-dir/blkin-test-20150225-160222/ust/uid/0/64-bit/ -p 9410 -s 127.0.0.1 + +Check Ceph traces on webpage:: + + Browse http://${zipkin-collector-ip}:9411 + Click "Find traces" -- cgit v1.2.3