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https://issues.apache.org/jira/browse/KAFKA-1642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14257686#comment-14257686
]
Bhavesh Mistry commented on KAFKA-1642:
---------------------------------------
[~ewencp],
Patch indeed solve the high CPU Problem reported by this bug. I have tested
all brokers down, one broker down and two broker down:
Here are some interesting Observations from YourKit:
0) Overall, patch has also brought down overall consumption in Normal Healthy
or Happy case where every thing is up and running. In old code (without
patch), I use to see about 10% of overall CPU used by process by io threads (4
in my case), it has reduce to 5% or less now with path.
1) When two brokers are down, then occasionally I see IO thread blocked. (
I did not see this when one brokers is down)
{code}
kafka-producer-network-thread | rawlog [BLOCKED] [DAEMON]
org.apache.kafka.clients.producer.internals.Metadata.fetch() Metadata.java:70
java.lang.Thread.run() Thread.java:744
{code}
2) record-error-rate metric remain zero despite following firewall rule.
In my opinion, it should have called
org.apache.kafka.clients.producer.Callback but I did not see that happening
either in either one or two brokers down. Should I file another issue for this
? Please confirm.
{code}
00100 reject tcp from me to b1.ip dst-port 9092
00200 reject tcp from me to b2.ip dst-port 9092
{code}
{code}
class LoggingCallBaHandler implements Callback {
/**
* A callback method the user can implement to provide
asynchronous
* handling of request completion. This method will be called
when the
* record sent to the server has been acknowledged. Exactly one
of the
* arguments will be non-null.
*
* @param metadata
* The metadata for the record that was sent (i.e.
the
* partition and offset). Null if an error occurred.
* @param exception
* The exception thrown during processing of this
record.
* Null if no error occurred.
*/
@Override
public void onCompletion(RecordMetadata metadata, Exception
exception) {
if(exception != null){
exception.printStackTrace();
}
}
}
{code}
I do not see any exception at all on console....not sure why ?
3) Application does NOT gracefully shutdown when there one or more brokers
are down. (io Thread never exits this is know issue )
{code}
"SIGTERM handler" daemon prio=5 tid=0x00007f8bd79e4000 nid=0x17907 waiting for
monitor entry [0x000000011e906000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.Shutdown.exit(Shutdown.java:212)
- waiting to lock <0x000000070008f7c0> (a java.lang.Class for
java.lang.Shutdown)
at java.lang.Terminator$1.handle(Terminator.java:52)
at sun.misc.Signal$1.run(Signal.java:212)
at java.lang.Thread.run(Thread.java:744)
"SIGTERM handler" daemon prio=5 tid=0x00007f8bd5159000 nid=0x1cb0b waiting for
monitor entry [0x000000011e803000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.Shutdown.exit(Shutdown.java:212)
- waiting to lock <0x000000070008f7c0> (a java.lang.Class for
java.lang.Shutdown)
at java.lang.Terminator$1.handle(Terminator.java:52)
at sun.misc.Signal$1.run(Signal.java:212)
at java.lang.Thread.run(Thread.java:744)
"SIGTERM handler" daemon prio=5 tid=0x00007f8bdd147800 nid=0x15d0b waiting for
monitor entry [0x000000011e30a000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.Shutdown.exit(Shutdown.java:212)
- waiting to lock <0x000000070008f7c0> (a java.lang.Class for
java.lang.Shutdown)
at java.lang.Terminator$1.handle(Terminator.java:52)
at sun.misc.Signal$1.run(Signal.java:212)
at java.lang.Thread.run(Thread.java:744)
"SIGTERM handler" daemon prio=5 tid=0x00007f8bdf820000 nid=0x770b waiting for
monitor entry [0x000000011e207000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.Shutdown.exit(Shutdown.java:212)
- waiting to lock <0x000000070008f7c0> (a java.lang.Class for
java.lang.Shutdown)
at java.lang.Terminator$1.handle(Terminator.java:52)
at sun.misc.Signal$1.run(Signal.java:212)
at java.lang.Thread.run(Thread.java:744)
"SIGTERM handler" daemon prio=5 tid=0x00007f8bdc393800 nid=0x1c30f waiting for
monitor entry [0x000000011e104000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.Shutdown.exit(Shutdown.java:212)
- waiting to lock <0x000000070008f7c0> (a java.lang.Class for
java.lang.Shutdown)
at java.lang.Terminator$1.handle(Terminator.java:52)
at sun.misc.Signal$1.run(Signal.java:212)
at java.lang.Thread.run(Thread.java:744)
"Thread-4" prio=5 tid=0x00007f8bdb39f000 nid=0xa107 in Object.wait()
[0x000000011ea89000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.$$YJP$$wait(Native Method)
at java.lang.Object.wait(Object.java)
at java.lang.Thread.join(Thread.java:1280)
- locked <0x0000000705c2f650> (a
org.apache.kafka.common.utils.KafkaThread)
at java.lang.Thread.join(Thread.java:1354)
at
org.apache.kafka.clients.producer.KafkaProducer.close(KafkaProducer.java:322)
at
"kafka-producer-network-thread | error" daemon prio=5 tid=0x00007f8bd814e000
nid=0x7403 runnable [0x000000011e6c0000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.KQueueArrayWrapper.$$YJP$$kevent0(Native Method)
at sun.nio.ch.KQueueArrayWrapper.kevent0(KQueueArrayWrapper.java)
at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:200)
at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
- locked <0x0000000705c109f8> (a sun.nio.ch.Util$2)
- locked <0x0000000705c109e8> (a java.util.Collections$UnmodifiableSet)
- locked <0x0000000705c105c8> (a sun.nio.ch.KQueueSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
at org.apache.kafka.common.network.Selector.select(Selector.java:322)
at org.apache.kafka.common.network.Selector.poll(Selector.java:212)
at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:192)
at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:184)
at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:128)
at java.lang.Thread.run(Thread.java:744)
{code}
Thank you for the patch fix.
Thanks,
Bhavesh
> [Java New Producer Kafka Trunk] CPU Usage Spike to 100% when network
> connection is lost
> ---------------------------------------------------------------------------------------
>
> Key: KAFKA-1642
> URL: https://issues.apache.org/jira/browse/KAFKA-1642
> Project: Kafka
> Issue Type: Bug
> Components: producer
> Affects Versions: 0.8.2
> Reporter: Bhavesh Mistry
> Assignee: Ewen Cheslack-Postava
> Priority: Blocker
> Fix For: 0.8.2
>
> Attachments:
> 0001-Initial-CPU-Hish-Usage-by-Kafka-FIX-and-Also-fix-CLO.patch,
> KAFKA-1642.patch, KAFKA-1642.patch, KAFKA-1642_2014-10-20_17:33:57.patch,
> KAFKA-1642_2014-10-23_16:19:41.patch
>
>
> I see my CPU spike to 100% when network connection is lost for while. It
> seems network IO thread are very busy logging following error message. Is
> this expected behavior ?
> 2014-09-17 14:06:16.830 [kafka-producer-network-thread] ERROR
> org.apache.kafka.clients.producer.internals.Sender - Uncaught error in kafka
> producer I/O thread:
> java.lang.IllegalStateException: No entry found for node -2
> at
> org.apache.kafka.clients.ClusterConnectionStates.nodeState(ClusterConnectionStates.java:110)
> at
> org.apache.kafka.clients.ClusterConnectionStates.disconnected(ClusterConnectionStates.java:99)
> at
> org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:394)
> at
> org.apache.kafka.clients.NetworkClient.maybeUpdateMetadata(NetworkClient.java:380)
> at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:174)
> at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:175)
> at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:115)
> at java.lang.Thread.run(Thread.java:744)
> Thanks,
> Bhavesh
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