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From "Masaki Yamakawa (JIRA)" <>
Subject [jira] [Created] (GEODE-2812) Add API to get list of live locators
Date Mon, 24 Apr 2017 02:11:04 GMT
Masaki Yamakawa created GEODE-2812:

             Summary: Add API to get list of live locators
                 Key: GEODE-2812
             Project: Geode
          Issue Type: Improvement
          Components: client/server
            Reporter: Masaki Yamakawa

There is a Geode cluster using a logical member group, and from the client, the connection
pool to the logical member group is connected using the PoolFactory API at the timing when
connection becomes necessary.
At this time, even though the locator that was running at the initial connection stops due
to reasons such as regular maintenance etc., even if the alternate locator is started before
maintenance, I can not connect to the locator in the static initial list.

# Client side:PoolManager.createFactory().addLocator("localhost", 10334).setServerGroup("GroupA").create("pool1");
# Geode cluster:start locator [ localhost:10335 ].
# Geode cluster:stop locator [ localhost:10334 ].
# Client side:PoolManager.createFactory().addLocator("localhost", 10334).setServerGroup("GroupB").create("pool2");

Therefore, I would like to decide the connection destination based on the live locator list
of another logical member group.
I added an API that can get the list of live locators from the Pool. Use the API as follows:

Pool pool = PoolManager.createFactory()
  .addLocator("localhost", 10334)

List<InetSocketAddress> = pool.getLiveLocators();

The list of live locators gets the result of the UpdateLocatorListTask periodically running
in AutoConnectionSourceImpl.
Therefore, whether or not it is alive will cause a time lag, depending on the task execution
Also, the result of ExplicitConnectionSourceImpl without using a locator is always empty.

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