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https://issues.apache.org/jira/browse/STORM-874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14712106#comment-14712106
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ASF GitHub Bot commented on STORM-874:
--------------------------------------
Github user kishorvpatil commented on the pull request:
https://github.com/apache/storm/pull/597#issuecomment-134761846
@harshach Sorry for so long in responding to it. The
`Utils.handleUncaughtException` writes ot STDOUT to avoid further major
exception by attempting to log exceptions. But otherwise we log them.
> Netty Threads do not handle Errors properly
> -------------------------------------------
>
> Key: STORM-874
> URL: https://issues.apache.org/jira/browse/STORM-874
> Project: Apache Storm
> Issue Type: Bug
> Affects Versions: 0.9.2-incubating, 0.10.0
> Reporter: Kishor Patil
>
> When low on memory, netty thread could get OOM which if not handled correctly
> can lead to unexpected behavior such as netty connection leaks.
> {code:java}
> java.lang.OutOfMemoryError: Direct buffer memory
> at java.nio.Bits.reserveMemory(Bits.java:658) ~[?:1.8.0_25]
> at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)
> ~[?:1.8.0_25]
> at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311) ~[?:1.8.0_25]
> at
> org.jboss.netty.buffer.ChannelBuffers.directBuffer(ChannelBuffers.java:167)
> ~[netty-3.9.4.Final.jar:?]
> at
> org.jboss.netty.buffer.ChannelBuffers.directBuffer(ChannelBuffers.java:151)
> ~[netty-3.9.4.Final.jar:?]
> at
> backtype.storm.messaging.netty.MessageBatch.buffer(MessageBatch.java:101)
> ~[storm-core-0.9.2-incubating-security.jar:0.9.2-incubating-security]
> at
> backtype.storm.messaging.netty.MessageEncoder.encode(MessageEncoder.java:32)
> ~[storm-core-0.9.2-incubating-security.jar:0.9.2-incubating-security]
> at
> org.jboss.netty.handler.codec.oneone.OneToOneEncoder.doEncode(OneToOneEncoder.java:66)
> ~[netty-3.9.4.Final.jar:?]
> at
> org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:59)
> ~[netty-3.9.4.Final.jar:?]
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:591)
> ~[netty-3.9.4.Final.jar:?]
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:582)
> ~[netty-3.9.4.Final.jar:?]
> at org.jboss.netty.channel.Channels.write(Channels.java:704)
> ~[netty-3.9.4.Final.jar:?]
> at org.jboss.netty.channel.Channels.write(Channels.java:671)
> ~[netty-3.9.4.Final.jar:?]
> at
> org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:248)
> ~[netty-3.9.4.Final.jar:?]
> at
> backtype.storm.messaging.netty.Client.tryDeliverMessages(Client.java:226)
> ~[storm-core-0.9.2-incubating-security.jar:0.9.2-incubating-security]
> at backtype.storm.messaging.netty.Client.send(Client.java:173)
> ~[storm-core-0.9.2-incubating-security.jar:0.9.2-incubating-security]
> {code}
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