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https://issues.apache.org/jira/browse/IGNITE-2720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Semen Boikov reassigned IGNITE-2720:
------------------------------------
Assignee: Semen Boikov
> TcpDiscoveryMulticastIpFinder is not thread safe.
> -------------------------------------------------
>
> Key: IGNITE-2720
> URL: https://issues.apache.org/jira/browse/IGNITE-2720
> Project: Ignite
> Issue Type: Bug
> Components: general
> Affects Versions: 1.5.0.final
> Reporter: Vladimir Ozerov
> Assignee: Semen Boikov
> Priority: Critical
> Fix For: 1.6
>
>
> *Problem*
> TcpDiscoveryMulticastIpFinder contains several non-thread-safe collections.
> E.g. {{reqItfs}} which is a {{HashSet}}.
> And these collections could be accessed from different thread concurrently.
> E.g., mentioned collection can be accessed from the following methods:
> 1) {{initializeLocalAddresses}} (invoked from {{spiStart}}) - this is already
> a problem for shared IP finder in case two nodes start in the same JVM.
> 2) {{getRegisteredAddresses}} - accessed from billion places including client
> reconnect routine.
> As a result we could receive things like that:
> {code}
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
> at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
> at
> org.apache.ignite.spi.discovery.tcp.ipfinder.multicast.TcpDiscoveryMulticastIpFinder.requestAddresses(TcpDiscoveryMulticastIpFinder.java:475)
> at
> org.apache.ignite.spi.discovery.tcp.ipfinder.multicast.TcpDiscoveryMulticastIpFinder.getRegisteredAddresses(TcpDiscoveryMulticastIpFinder.java:431)
> at
> org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi.registeredAddresses(TcpDiscoverySpi.java:1603)
> at
> org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi.resolvedAddresses(TcpDiscoverySpi.java:1552)
> at
> org.apache.ignite.spi.discovery.tcp.ClientImpl.joinTopology(ClientImpl.java:475)
> at
> org.apache.ignite.spi.discovery.tcp.ClientImpl.access$900(ClientImpl.java:118)
> at
> org.apache.ignite.spi.discovery.tcp.ClientImpl$MessageWorker.tryJoin(ClientImpl.java:1509)
> at
> org.apache.ignite.spi.discovery.tcp.ClientImpl$MessageWorker.body(ClientImpl.java:1328)
> at org.apache.ignite.spi.IgniteSpiThread.run(IgniteSpiThread.java:62)
> {code}
> *Solution*
> Investigate access patterns and make multicast IP finder thread-safe.
> Porbably we have similar problems in other IP finders - need to check that.
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