[
https://issues.apache.org/jira/browse/AVRO-1407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Doug Cutting updated AVRO-1407:
-------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
I committed this. Thanks, Gareth!
> NettyTransceiver can cause a infinite loop when slow to connect
> ---------------------------------------------------------------
>
> Key: AVRO-1407
> URL: https://issues.apache.org/jira/browse/AVRO-1407
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.7.5, 1.7.6
> Reporter: Gareth Davis
> Assignee: Gareth Davis
> Fix For: 1.7.8
>
> Attachments: AVRO-1407-1.patch, AVRO-1407-2.patch,
> AVRO-1407-testcase.patch
>
>
> When a new {{NettyTransceiver}} is created it forces the channel to be
> allocated and connected to the remote host. it waits for the connectTimeout
> ms on the [connect channel
> future|https://github.com/apache/avro/blob/1579ab1ac95731630af58fc303a07c9bf28541d6/lang/java/ipc/src/main/java/org/apache/avro/ipc/NettyTransceiver.java#L271]
> this is obivously a good thing it's only that on being unsuccessful, ie
> {{!channelFuture.isSuccess()}} an exception is thrown and the call to the
> constructor fails with an {{IOException}}, but has the potential to leave a
> active channel associated with the {{ChannelFactory}}
> The problem is that a Netty {{NioClientSocketChannelFactory}} will not
> shutdown if there are active channels still around and if you have supplied
> the {{ChannelFactory}} to the {{NettyTransceiver}} then you will not be able
> to cancel it by calling {{ChannelFactory.releaseExternalResources()}} like
> the [Flume Avro RPC client
> does|https://github.com/apache/flume/blob/b8cf789b8509b1e5be05dd0b0b16c5d9af9698ae/flume-ng-sdk/src/main/java/org/apache/flume/api/NettyAvroRpcClient.java#L158].
> In order to recreate this you need a very laggy network, where the connect
> attempt takes longer than the connect timeout but does actually work, this
> very hard to organise in a test case, although I do have a test setup using
> vagrant VM's that recreates this everytime, using the Flume RPC client and
> server.
> The following stack is from a production system, it won't ever leave recover
> until the channel is disconnected (by forcing a disconnect at the remote
> host) or restarting the JVM.
> {noformat:title=Production stack trace}
> "TLOG-0" daemon prio=10 tid=0x00007f581c7be800 nid=0x39a1 waiting on
> condition [0x00007f57ef9f2000]
> java.lang.Thread.State: TIMED_WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> parking to wait for <0x00000007218b16e0> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:196)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
> at
> java.util.concurrent.ThreadPoolExecutor.awaitTermination(ThreadPoolExecutor.java:1253)
> at
> org.jboss.netty.util.internal.ExecutorUtil.terminate(ExecutorUtil.java:103)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorkerPool.releaseExternalResources(AbstractNioWorkerPool.java:80)
> at
> org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory.releaseExternalResources(NioClientSocketChannelFactory.java:181)
> at
> org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:142)
> at
> org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:101)
> at
> org.apache.flume.api.NettyAvroRpcClient.configure(NettyAvroRpcClient.java:564)
> locked <0x00000006c30ae7b0> (a org.apache.flume.api.NettyAvroRpcClient)
> at
> org.apache.flume.api.RpcClientFactory.getInstance(RpcClientFactory.java:88)
> at
> org.apache.flume.api.LoadBalancingRpcClient.createClient(LoadBalancingRpcClient.java:214)
> at
> org.apache.flume.api.LoadBalancingRpcClient.getClient(LoadBalancingRpcClient.java:205)
> locked <0x00000006a97b18e8> (a org.apache.flume.api.LoadBalancingRpcClient)
> at
> org.apache.flume.api.LoadBalancingRpcClient.appendBatch(LoadBalancingRpcClient.java:95)
> at
> com.ean.platform.components.tlog.client.service.AvroRpcEventRouter$1.call(AvroRpcEventRouter.java:45)
> at
> com.ean.platform.components.tlog.client.service.AvroRpcEventRouter$1.call(AvroRpcEventRouter.java:43)
> {noformat}
> The solution is very simple, and a patch should be along in a moment.
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