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https://issues.apache.org/jira/browse/KAFKA-2134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651343#comment-14651343
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ASF GitHub Bot commented on KAFKA-2134:
---------------------------------------
GitHub user becketqin opened a pull request:
https://github.com/apache/kafka/pull/104
Fix for KAFKA-2134, fix replica offset truncate to beginning during leader
migration.
Fix replica truncate log to beginning during leader migration.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/becketqin/kafka KAFKA-2134
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/104.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #104
----
commit 71f8a4716e1f0b4fc2bd88aa30fe38aef8a9f92e
Author: Jiangjie Qin <[email protected]>
Date: 2015-08-03T02:22:02Z
Fix for KAFKA-2134, fix replica offset truncate to beginning during leader
migration.
----
> Producer blocked on metric publish
> ----------------------------------
>
> Key: KAFKA-2134
> URL: https://issues.apache.org/jira/browse/KAFKA-2134
> Project: Kafka
> Issue Type: Bug
> Components: producer
> Affects Versions: 0.8.2.1
> Environment: debian7, java8
> Reporter: Vamsi Subhash Achanta
> Assignee: Jun Rao
> Priority: Blocker
>
> Hi,
> We have a REST api to publish to a topic. Yesterday, we started noticing that
> the producer is not able to produce messages at a good rate and the
> CLOSE_WAITs of our producer REST app are very high. All the producer REST
> requests are hence timing out.
> When we took the thread dump and analysed it, we noticed that the threads are
> getting blocked on JmxReporter metricChange. Here is the attached stack trace.
> "dw-70 - POST /queues/queue_1/messages" #70 prio=5 os_prio=0
> tid=0x00007f043c8bd000 nid=0x54cf waiting for monitor entry
> [0x00007f04363c7000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.kafka.common.metrics.JmxReporter.metricChange(JmxReporter.java:76)
> - waiting to lock <0x00000005c1823860> (a java.lang.Object)
> at
> org.apache.kafka.common.metrics.Metrics.registerMetric(Metrics.java:182)
> - locked <0x00000007a5e526c8> (a
> org.apache.kafka.common.metrics.Metrics)
> at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:165)
> - locked <0x00000007a5e526e8> (a
> org.apache.kafka.common.metrics.Sensor)
> When I looked at the code of metricChange method, it uses a synchronised
> block on an object resource and it seems that it is held by another.
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