Table of Contents
ZooKeeper protocol analyzer and stats gathering daemon
You can install ZKTraffic via pip:
$ pip install zktraffic
Or run it from source (if you have the dependencies installed, see below):
$ git clone https://github.com/twitter/zktraffic.git
$ cd zktraffic
$ sudo ZKTRAFFIC_SOURCE=1 bin/zk-dump --iface=eth0
To get a quick count of requests by path:
$ sudo ZKTRAFFIC_SOURCE=1 bin/zk-dump --iface=eth0 --count-requests 10000 --sort-by path
/ 1749
/services/prod/search 846
/configs/teleportation/features 843
Or by type:
$ sudo ZKTRAFFIC_SOURCE=1 bin/zk-dump --iface=eth0 --count-requests 10000 --sort-by type
GetChildrenRequest 9044
ExistsRequest 958
You can also measure latencies by path (avg, p95 and p99):
$ sudo ZKTRAFFIC_SOURCE=1 bin/zk-dump --measure-latency 1000 --group-by path --aggregation-depth 2 --sort-by p99
path avg p95 p99
--------------- ----------- ---------- ----------
/party/services 0.000199077 0.00048846 0.00267805
/party 0.000349498 0.00136839 0.00201204
/party/configs 0.000157728 0.00036664 0.00122663
Or by type:
$ sudo ZKTRAFFIC_SOURCE=1 bin/zk-dump --measure-latency 1000 --group-by type --sort-by p99
type avg p95 p99
---------------------- ----------- ----------- -----------
CreateEphemeralRequest 0.000735009 0.000978041 0.0032404
GetChildrenRequest 0.000182547 0.000453258 0.00220628
ExistsRequest 0.000162728 0.000430155 0.000862937
Or by client:
$ sudo ZKTRAFFIC_SOURCE=1 bin/zk-dump --measure-latency 1000 --group-by client --sort-by p99
client avg p95 p99
---------------------- ----------- ----------- -----------
10.0.1.3:44308 0.000735009 0.000978041 0.0032404
10.0.1.6:34305 0.000182547 0.000453258 0.00220628
10.0.1.9:36110 0.000162728 0.000430155 0.000862937
Or use the stats gathering daemon:
$ sudo ZKTRAFFIC_SOURCE=1 bin/zk-stats-daemon --iface=eth0 --http-port=9090
Or you can build PEX files — from the source — for any of the available tools:
$ pip install pex
# zk-dump
$ pex -v -e zktraffic.cli.zk -o zk-dump.pex .
# zk-stats-daemon
$ pex -v -e zktraffic.cli.stats_daemon -o stats-daemon.pex .
# zab-dump
$ pex -v -e zktraffic.cli.zab -o zab-dump.pex .
# fle-dump
$ pex -v -e zktraffic.cli.fle -o fle-dump.pex .
More info about PEX here.
An {iptraf,top}-esque traffic monitor for ZooKeeper. Right now it exports per-path (and global) stats. Eventually it'll be made to export per-user stats too.
It has a front-end, zk-dump, that can be used in interactive mode to dump traffic:
# need root or CAP_NET_ADMIN & CAP_NET_RAW
$ sudo zk-dump --iface eth0
21:08:05:991542 ConnectRequest(ver=0, zxid=0, timeout=10000, session=0x0, readonly=False, client=127.0.0.1:50049)
————————►21:08:06:013513 ConnectReply(ver=0, timeout=10000, session=0x148cf0aedc60000, readonly=False, client=127.0.0.1:50049)
21:08:07:432361 ExistsRequest(xid=1, path=/, watch=False, size=14, client=127.0.0.1:50049)
————————►21:08:07:447353 ExistsReply(xid=1, zxid=31, error=0, client=127.0.0.1:50049)
21:08:07:448033 GetChildrenRequest(xid=2, path=/, watch=False, size=14, client=127.0.0.1:50049)
————————►21:08:07:456169 GetChildrenReply(xid=2, zxid=31, error=0, count=1, client=127.0.0.1:50049)
...
Or, it can work in daemon mode from which it exposes HTTP/JSON endpoints with stats that can be fed into your favourite data collection system:
$ sudo zk-stats-daemon.pex --app_daemonize --aggregation-depth=5
# Wait for 1 min and:
$ sleep 60 && curl http://localhost:7070/json/paths | python -mjson.tool
{
"ConnectRequest": 2,
"ConnectRequestBytes": 90,
"CreateRequest/configs": 2,
"CreateRequest/configs/server": 2,
"CreateRequest/discovery": 2,
"CreateRequest/discovery/hosts": 2,
"CreateRequest/discovery/services": 2,
"CreateRequestBytes/configs": 110,
"CreateRequestBytes/configs/server": 124,
"CreateRequestBytes/discovery": 114,
"CreateRequestBytes/discovery/hosts": 126,
"CreateRequestBytes/discovery/services": 132,
"ExistsRequest/": 1574,
"ExistsRequest/configs": 3,
"ExistsRequest/configs/server": 2,
"ExistsRequest/discovery": 4,
"ExistsRequest/discovery/hosts": 2,
"ExistsRequest/discovery/services": 2,
"ExistsRequestBytes/": 22036,
"ExistsRequestBytes/configs": 63,
"ExistsRequestBytes/configs/server": 56,
"ExistsRequestBytes/discovery": 92,
"ExistsRequestBytes/discovery/hosts": 58,
"ExistsRequestBytes/discovery/services": 64,
"GetChildrenRequest/configs": 1285,
"GetChildrenRequest/configs/server": 1242,
"GetChildrenRequest/discovery": 1223,
"GetChildrenRequest/discovery/hosts": 1250,
"GetChildrenRequest/discovery/services": 1222,
"GetChildrenRequest/zookeeper/config": 1285,
"GetChildrenRequest/zookeeper/quota/limits": 1228,
"GetChildrenRequest/zookeeper/quota/limits/by-path": 1269,
"GetChildrenRequest/zookeeper/quota/limits/global": 1230,
"GetChildrenRequest/zookeeper/quota/stats/by-path": 1222,
"GetChildrenRequestBytes/discovery/hosts": 36250,
"GetChildrenRequestBytes/discovery/services": 39104,
"GetChildrenRequestBytes/zookeeper/config": 38550,
"GetChildrenRequestBytes/zookeeper/quota/limits": 44208,
"GetChildrenRequestBytes/zookeeper/quota/limits/by-path": 55836,
"GetChildrenRequestBytes/zookeeper/quota/limits/global": 52890,
"GetChildrenRequestBytes/zookeeper/quota/limits/slices": 51815,
"GetChildrenRequestBytes/zookeeper/quota/stats": 42630,
"GetChildrenRequestBytes/zookeeper/quota/stats/by-path": 52546,
"GetChildrenRequestBytes/zookeeper/quota/stats/global": 50568,
"reads/": 2761,
"reads/configs": 1288,
"reads/configs/server": 1244,
"reads/discovery": 1227,
"reads/discovery/hosts": 1252,
"reads/discovery/services": 1224,
"reads/zookeeper/config": 1285,
"reads/zookeeper/quota/limits": 1228,
"reads/zookeeper/quota/limits/by-path": 1269,
"reads/zookeeper/quota/limits/global": 1230,
"readsBytes/": 38654,
"readsBytes/discovery/services": 39168,
"readsBytes/zookeeper/config": 38550,
"readsBytes/zookeeper/quota/limits": 44208,
"readsBytes/zookeeper/quota/limits/by-path": 55836,
"readsBytes/zookeeper/quota/limits/global": 52890,
"readsBytes/zookeeper/quota/limits/slices": 51815,
"readsBytes/zookeeper/quota/stats": 42630,
"readsBytes/zookeeper/quota/stats/by-path": 52546,
"readsBytes/zookeeper/quota/stats/global": 50568,
"total/readBytes": 655586,
"total/reads": 21251,
"total/writeBytes": 606,
"total/writes": 10,
"writes/": 0,
"writes/configs": 2,
"writes/configs/server": 2,
"writes/discovery": 2,
"writes/discovery/hosts": 2,
"writes/discovery/services": 2,
"writesBytes/": 0,
"writesBytes/configs": 110,
"writesBytes/configs/server": 124,
"writesBytes/discovery": 114,
"writesBytes/discovery/hosts": 126,
"writesBytes/discovery/services": 132
}
Other relevant endpoints for stats are:
- /json/ips: top-N per-ip stats
- /json/auths: per-auth stats
- /json/auths-dump: a full dump of known auths
- /json/info: process uptime and introspection info
- /threads: stacks for all threads
Please see CONTRIBUTING.md.
Along with zk-dump and zk-stats-daemon, you can find fle-dump which allows you to inspect FastLeaderElection traffic (i.e.: the protocol by which ZooKeeper decides who will lead and the mechanism by which the leader is subsequently discovered):
$ sudo fle-dump --iface eth0 -c
Notification(
timestamp=00:57:12:593254,
src=10.0.0.1:32938,
dst=10.0.0.2:3888,
state=following,
leader=3,
zxid=0,
election_epoch=0,
peer_epoch=0,
config=
server.0=10.0.0.1:2889:3888:participant;0.0.0.0:2181
server.1=10.0.0.2:2889:3888:participant;0.0.0.0:2181
server.2=10.0.0.3:2889:3888:participant;0.0.0.0:2181
server.3=10.0.0.4:2889:3888:participant;0.0.0.0:2181
server.4=10.0.0.5:2889:3888:participant;0.0.0.0:2181
version=10010d4d6
)
Notification(
timestamp=00:57:12:595525,
src=10.0.0.2:3888,
dst=10.0.0.1:32938,
state=looking,
leader=1,
zxid=4296326153,
election_epoch=1,
peer_epoch=1,
config=
server.0=10.0.0.1:2889:3888:participant;0.0.0.0:2181
server.1=10.0.0.2:2889:3888:participant;0.0.0.0:2181
server.2=10.0.0.3:2889:3888:participant;0.0.0.0:2181
server.3=10.0.0.4:2889:3888:participant;0.0.0.0:2181
server.4=10.0.0.5:2889:3888:participant;0.0.0.0:2181
version=10010d4d6
)
...
Note: for initial messages to be visible you'll need the patch available at ZOOKEEPER-2098.
If you are interested in debugging ZAB (ZooKeeper Atomic Broadcast protocol), you can use zab-dump:
$ sudo zab-dump --iface eth0
Request(
cxid=6,
dst=10.0.0.1:2889,
length=112,
req_type=CreateRequest,
session_id=0x34e4d23b0d70001,
src=10.0.0.2:48604,
timestr=22:54:31:995353,
zxid=-1,
)
Proposal(
cxid=6,
dst=10.0.0.2:48603,
length=110,
session_id=0x34e4d23b0d70001,
src=10.0.0.1:2889,
timestr=22:54:31:995753,
txn_time=1435816471995,
txn_type=CreateRequest,
txn_zxid=8589934619,
zxid=8589934619,
)
Proposal(
cxid=6,
dst=10.0.0.1:48604,
length=110,
session_id=0x34e4d23b0d70001,
src=10.0.0.1:2889,
timestr=22:54:31:995755,
txn_time=1435816471995,
txn_type=CreateRequest,
txn_zxid=8589934619,
zxid=8589934619,
)
Proposal(
cxid=6,
dst=10.0.0.3:48605,
length=110,
session_id=0x34e4d23b0d70001,
src=10.0.0.1:2889,
timestr=22:54:31:995770,
txn_time=1435816471995,
txn_type=CreateRequest,
txn_zxid=8589934619,
zxid=8589934619,
)
Ack(
dst=10.0.0.1:2889,
length=20,
src=10.0.0.1:48603,
timestr=22:54:31:996068,
zxid=8589934619,
)
Ack(
dst=10.0.0.1:2889,
length=20,
src=10.0.0.1:48604,
timestr=22:54:31:996316,
zxid=8589934619,
)
Ack(
dst=10.0.0.1:2889,
length=20,
src=10.0.0.1:48604,
timestr=22:54:31:996318,
zxid=8589934619,
)
Commit(
dst=10.0.0.1:48603,
length=20,
src=10.0.0.1:2889,
timestr=22:54:31:996193,
zxid=8589934619,
)
Commit(
dst=10.0.0.2:48604,
length=20,
src=10.0.0.1:2889,
timestr=22:54:31:996195,
zxid=8589934619,
)
Commit(
dst=10.0.0.2:48605,
length=20,
src=10.0.0.1:2889,
timestr=22:54:31:996442,
zxid=8589934619,
)
...
Although no one has tried running this on OS X in production, it can be used for some parts of development and unit testing. If you are running on OS X, please run the following to install the correct dependencies:
$ pip install -r ./osx_requirements.txt- Python 2.7 (Py3K soon)
- ansicolors
- dpkt-fix
- psutil>=2.1.0
- scapy==2.3.1
- twitter.common.app
- twitter.common.collections
- twitter.common.exceptions
- twitter.common.http
- twitter.common.log