[
https://issues.apache.org/jira/browse/KAFKA-1832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
barney updated KAFKA-1832:
--------------------------
Description:
*How to replay the problem:*
1) producer configuration:
1.1) producer.type=async
1.2) metadata.broker.list=not.existed.com:9092
Make sure the host 'not.existed.com' does not exist in DNS server or /etc/hosts;
2) send a lot of messages continuously using the above producer
It will cause 'java.net.SocketException: Too many open files' after a while, or
you can use 'lsof -p $pid|wc -l' to check the count of open files which will be
increasing as time goes by until it reaches the system limit(check by 'ulimit
-n').
*Problem cause:*
{code:title=kafka.network.BlockingChannel|borderStyle=solid}
channel.connect(new InetSocketAddress(host, port))
{code}
this line will throw an exception
'java.nio.channels.UnresolvedAddressException' when broker host does not exist,
and at this same time the field 'connected' is false;
In kafka.producer.SyncProducer, 'disconnect()' will not invoke
'blockingChannel.disconnect()' because 'blockingChannel.isConnected' is false
which means the FileDescriptor will be created but never closed;
*More:*
When the broker is an non-existent ip(for example:
metadata.broker.list=1.1.1.1:9092) instead of an non-existent host, the problem
will not appear;
In SocketChannelImpl.connect(), 'Net.checkAddress()' is not in try-catch block
but 'Net.connect()' is in, that makes the difference;
*Temporary Solution:*
{code:title=kafka.network.BlockingChannel|borderStyle=solid}
try
{
channel.connect(new InetSocketAddress(host, port))
}
catch
{
case e: UnresolvedAddressException =>
{
disconnect();
throw e
}
}
{code}
was:
How to replay the problem:
1) producer configuration:
1.1) producer.type=async
1.2) metadata.broker.list=not.existed.com:9092
Make sure the host 'not.existed.com' does not exist in DNS server or /etc/hosts;
2) send a lot of messages continuously using the above producer
It will cause 'java.net.SocketException: Too many open files' after a while, or
you can use 'lsof -p $pid|wc -l' to check the count of open files which will be
increasing as time goes by until it reaches the system limit(check by 'ulimit
-n').
Problem cause:
In kafka.network.BlockingChannel,
'channel.connect(new InetSocketAddress(host, port))'
this line will throw an exception
'java.nio.channels.UnresolvedAddressException' when broker host does not exist,
and at this same time the field 'connected' is false;
In kafka.producer.SyncProducer, 'disconnect()' will not invoke
'blockingChannel.disconnect()' because 'blockingChannel.isConnected' is false
which means the FileDescriptor will be created but never closed;
More:
When the broker is an non-existent ip(for example:
metadata.broker.list=1.1.1.1:9092) instead of an non-existent host, the problem
will not appear;
In SocketChannelImpl.connect(), 'Net.checkAddress()' is not in try-catch block
but 'Net.connect()' is in, that makes the difference;
Temporary Solution:
In kafka.network.BlockingChannel:
try
{
channel.connect(new InetSocketAddress(host, port))
}
catch
{
case e: UnresolvedAddressException =>
{
disconnect();
throw e
}
}
> Async Producer will cause 'java.net.SocketException: Too many open files'
> when broker host does not exist
> ---------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-1832
> URL: https://issues.apache.org/jira/browse/KAFKA-1832
> Project: Kafka
> Issue Type: Bug
> Components: producer
> Affects Versions: 0.8.1, 0.8.1.1
> Environment: linux
> Reporter: barney
> Assignee: Jun Rao
>
> *How to replay the problem:*
> 1) producer configuration:
> 1.1) producer.type=async
> 1.2) metadata.broker.list=not.existed.com:9092
> Make sure the host 'not.existed.com' does not exist in DNS server or
> /etc/hosts;
> 2) send a lot of messages continuously using the above producer
> It will cause 'java.net.SocketException: Too many open files' after a while,
> or you can use 'lsof -p $pid|wc -l' to check the count of open files which
> will be increasing as time goes by until it reaches the system limit(check by
> 'ulimit -n').
> *Problem cause:*
> {code:title=kafka.network.BlockingChannel|borderStyle=solid}
> channel.connect(new InetSocketAddress(host, port))
> {code}
> this line will throw an exception
> 'java.nio.channels.UnresolvedAddressException' when broker host does not
> exist, and at this same time the field 'connected' is false;
> In kafka.producer.SyncProducer, 'disconnect()' will not invoke
> 'blockingChannel.disconnect()' because 'blockingChannel.isConnected' is false
> which means the FileDescriptor will be created but never closed;
> *More:*
> When the broker is an non-existent ip(for example:
> metadata.broker.list=1.1.1.1:9092) instead of an non-existent host, the
> problem will not appear;
> In SocketChannelImpl.connect(), 'Net.checkAddress()' is not in try-catch
> block but 'Net.connect()' is in, that makes the difference;
> *Temporary Solution:*
> {code:title=kafka.network.BlockingChannel|borderStyle=solid}
> try
> {
> channel.connect(new InetSocketAddress(host, port))
> }
> catch
> {
> case e: UnresolvedAddressException =>
> {
> disconnect();
> throw e
> }
> }
> {code}
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