kscaldef / summingbird-hybrid-example Goto Github PK

A self-contained example of summingbird running in hybrid mode

Scala 100.00%

summingbird-hybrid-example's Introduction

This is a modification of the summingbird-example provided by Twitter,
using a Kafka source for events and implementing the hybrid batch-realtime
approach.

PREREQUISITES
-------------

You need to have memcached, zookeeper, and kafka installed and running
on your machine on the usual ports.


RUNNING
---------------------------------

To demo the hybrid mode:

  sbt 'run-main summingbird.proto.RunHybrid'

You'll see a bunch of start-up messages, and then it should settle into regularly
spitting out some "sanity check" messages once a minute, both a detailed view of
what's been computed on a single key, and aggregate data about how many messages
have been produced and seen at various stages.  (Some small lag is expected, but
should remain fairly steady over time.)

Once every 5 minutes, the demo rolls over a new log file and kicks off a batch
computation to update the "offline" store.


Example output after running for a while:

14/03/27 13:31:30 INFO example.HybridRunner$: Offline: Some((BatchID.4653174,296))
14/03/27 13:31:30 INFO example.HybridRunner$: Online: (BatchID.4653174,Some(10))
14/03/27 13:31:30 INFO example.HybridRunner$: Hybrid: Some(306)
14/03/27 13:31:30 INFO example.RunHybrid$: Events Produced: 2875
14/03/27 13:31:30 INFO example.RunHybrid$: Events Ingested: 2875
14/03/27 13:31:30 INFO example.RunHybrid$: Events Counted (offline): 2784
14/03/27 13:31:30 INFO example.RunHybrid$: Events Counted (online): 81
14/03/27 13:31:30 INFO example.RunHybrid$: Events Counted (hybrid): 2865

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summingbird-hybrid-example's Issues

data never gets ingested

Thanks for this awesome example.
I think I'm stuck on something really stupid. Basically, I got things working except that on starting the program Zookeeper throws this error "no brokers found when trying to rebalance."
After that I can see the events being produced and put into the kafka queue, but nothing gets ingested. (Events Ingested is always 0)

ingestion error + Path length must be > 0

Hi I am using Kafka 8 to run this hybrid example. I get this exceptions when I try to run (It says the error is because it expects the path length to be > 0 and is found to be 0). Any idea on how to fix this?

14/11/18 14:55:57 ERROR proto.RunHybrid$: ingestion error
java.lang.ExceptionInInitializerError
at summingbird.proto.RunHybrid$$anon$1.run(HybridRunner.scala:88)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Path length must be > 0
at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:48)
at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:35)
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:626)
at org.I0Itec.zkclient.ZkConnection.create(ZkConnection.java:87)
at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:308)
at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:304)
at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
at org.I0Itec.zkclient.ZkClient.create(ZkClient.java:304)
at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:213)
at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:223)
at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:223)
at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:223)
at kafka.utils.ZkUtils$.createParentPath(Unknown Source)
at kafka.utils.ZkUtils$.createEphemeralPath(Unknown Source)
at kafka.utils.ZkUtils$.createEphemeralPathExpectConflict(Unknown Source)
at kafka.utils.ZkUtils$.createEphemeralPathExpectConflictHandleZKBug(Unknown Source)
at kafka.consumer.ZookeeperConsumerConnector.kafka$consumer$ZookeeperConsumerConnector$$registerConsumerInZK(Unknown Source)
at kafka.consumer.ZookeeperConsumerConnector.consume(Unknown Source)
at kafka.consumer.ZookeeperConsumerConnector.createMessageStreams(Unknown Source)
at kafka.consumer.ZookeeperConsumerConnector.createMessageStreams(Unknown Source)
at summingbird.proto.Ingestion$.(Ingestion.scala:33)
at summingbird.proto.Ingestion$.(Ingestion.scala)
... 8 more

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