[jira] [Commented] (KAFKA-1633) Data loss if broker is killed

["Jun Rao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-1633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14133278#comment-14133278 ] 

Jun Rao commented on KAFKA-1633:
--------------------------------

What's the producer ack you used in your test? In general, we guarantee no data loss if (1) producer uses ack=-1 and (2) there are fewer failures than # replicas.

> Data loss if broker is killed
> -----------------------------
>
>                 Key: KAFKA-1633
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1633
>             Project: Kafka
>          Issue Type: Bug
>          Components: producer 
>    Affects Versions: 0.8.1.1
>         Environment: centos 6.3, open jdk 7
>            Reporter: gautham varada
>            Assignee: Jun Rao
>
> We have a 2 node kafka cluster, we experienced data loss when we did a kill -9 on the brokers.  We also found a work around to prevent this loss.
> Replication factor :2, 4 partitions
> Steps to reproduce
> 1. Create a 2 node cluster with replication factor 2, num partitions 4
> 2. We used Jmeter to pump events
> 3. We used kafka web console to inspect the log size after the test
> During the test, we simultaneously killed the brokers using kill -9 and we tallied the metrics reported by jmeter and the size we observed in the web console, we lost tons of messages.
> We went back and set the Producer retry to 1 instead of the default 3 and repeated the above tests and we did not loose a single message.
> We repeated the above tests with the Producer retry set to 3 and 1 with a single broker and we observed data loss when the retry was 3 and no loss when the retry was 1



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