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https://issues.apache.org/jira/browse/SPARK-31219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Graves resolved SPARK-31219.
-----------------------------------
Fix Version/s: 3.1.0
3.0.0
Assignee: Manu Zhang
Resolution: Fixed
> YarnShuffleService doesn't close idle netty channel
> ---------------------------------------------------
>
> Key: SPARK-31219
> URL: https://issues.apache.org/jira/browse/SPARK-31219
> Project: Spark
> Issue Type: Bug
> Components: Shuffle
> Affects Versions: 2.4.5, 3.0.0
> Reporter: Manu Zhang
> Assignee: Manu Zhang
> Priority: Major
> Fix For: 3.0.0, 3.1.0
>
>
> Recently, we find our YarnShuffleService has a lot of [half-open
> connections|https://blog.stephencleary.com/2009/05/detection-of-half-open-dropped.html]
> where shuffle servers' connections are active while clients have already
> closed.
> For example, from server's `ss -nt sport = :7337` output we have
> {code:java}
> ESTAB 0 0 server:7337 client:port
> {code}
> However, on client `ss -nt dport =: 7337 | grep server` would return nothing.
> Looking at the code, `YarnShuffleService` creates a `TransportContext` with
> `closeIdleConnections` set to false.
> {code:java}
> public class YarnShuffleService extends AuxiliaryService {
> ...
> @Override protected void serviceInit(Configuration conf) throws Exception
> {
> ...
> transportContext = new TransportContext(transportConf, blockHandler);
> ...
> }
> ...
> }
> public class TransportContext implements Closeable {
> ...
> public TransportContext(TransportConf conf, RpcHandler rpcHandler) {
> this(conf, rpcHandler, false, false);
> }
> public TransportContext(TransportConf conf, RpcHandler rpcHandler, boolean
> closeIdleConnections) {
> this(conf, rpcHandler, closeIdleConnections, false);
> }
> ...
> }{code}
> Hence, it's possible the channel may never get closed at server side if the
> server misses the event that the client has closed it.
> I find that parameter is true for `ExternalShuffleService`.
> Is there any reason for the difference here ? Can we enable
> closeIdleConnections in YarnShuffleService or at least add a configuration to
> enable it ?
>
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