[jboss-jira] [JBoss JIRA] (JGRP-2335) Code for determining the coordinator hangs in certain conditions

[Aieksiei Illarionov (Jira)]

Aieksiei Illarionov created JGRP-2335:
-----------------------------------------

             Summary: Code for determining the coordinator hangs in certain conditions
                 Key: JGRP-2335
                 URL: https://issues.jboss.org/browse/JGRP-2335
             Project: JGroups
          Issue Type: Bug
            Reporter: Aieksiei Illarionov
            Assignee: Bela Ban


Affected version:
{code:xml}
        <dependency>
            <groupId>org.jgroups</groupId>
            <artifactId>jgroups</artifactId>
            <version>4.0.0.Final</version>
        </dependency>
{code}

ClientGmsImpl#joinInternal hangs because #firstOfAllClients always returns false when all of the following conditions are satisfied:
- using JDBC_PING for discovery protocol
- JGROUPSPING table contains data from previous sessions
- all of the previous sessions were killed (kill -9)
- AddressGenerator is not customized

The sorted set
{code:java}
SortedSet<Address> clients=new TreeSet<>();
{code}

contains the dead servers discovered from JGROUPSPING. When the new server is added to the sorted set, it never becomes the first in the sorted set.

Suggestions: either
a) somehow involve MembershipChangePolicy in ordering strategy, or
b) make the new server (joiner) the first in the sorted set, or
c) make UUID addresses to sort depending on their time of creation.

I've used the following config:
{code:xml}
<!--
    TCP based stack, with flow control and message bundling. This is usually used when IP
    multicasting cannot be used in a network, e.g. because it is disabled (routers discard multicast).
    Note that TCP.bind_addr and TCPPING.initial_hosts should be set, possibly via system properties, e.g.
    -Djgroups.bind_addr=192.168.5.2 and -Djgroups.tcpping.initial_hosts=192.168.5.2[7800]
    author: Bela Ban
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="urn:org:jgroups"
        xmlns:fork="fork"
        xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/jgroups.xsd fork http://www.jgroups.org/schema/fork-stacks.xsd">
    <TCP bind_port="7800"
         port_range="10"
         bind_addr="<placeholder here>"
         recv_buf_size="${tcp.recv_buf_size:130k}"
         send_buf_size="${tcp.send_buf_size:130k}"
         max_bundle_size="64K"
         sock_conn_timeout="300"

         thread_pool.min_threads="0"
         thread_pool.max_threads="20"
         thread_pool.keep_alive_time="30000"/>

    <JDBC_PING
            remove_all_data_on_view_change="true"
            connection_driver="com.microsoft.sqlserver.jdbc.SQLServerDriver"
            connection_url="jdbc:sqlserver://localhost:1433;databaseName=mydatabase"
            connection_username="user"
            connection_password="password"
    />

    <MERGE3  min_interval="10000"
             max_interval="30000"/>
    <FD_SOCK/>
    <FD timeout="3000" max_tries="3" />
    <VERIFY_SUSPECT timeout="1500"  />
    <BARRIER />
    <pbcast.NAKACK2 use_mcast_xmit="false"
                    discard_delivered_msgs="true"/>
    <UNICAST3
            conn_close_timeout="240000"
            xmit_interval="5000"/>
    <pbcast.STABLE desired_avg_gossip="50000"
                   max_bytes="4M"/>
    <pbcast.GMS print_local_addr="true" join_timeout="2000"
                view_bundling="true"
                membership_change_policy="ru.illar.AppMembershipChangePolicy"/>
    <MFC max_credits="2M"
         min_threshold="0.4"/>
    <FRAG2 frag_size="60K"  />
    <!--RSVP resend_interval="2000" timeout="10000"/-->
    <pbcast.STATE_TRANSFER/>
</config>
{code}



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