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https://issues.apache.org/jira/browse/GEODE-10123?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Owen Nichols closed GEODE-10123.
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> Multiple execution of Create region command results with duplicated region in
> cluster configuration
> ---------------------------------------------------------------------------------------------------
>
> Key: GEODE-10123
> URL: https://issues.apache.org/jira/browse/GEODE-10123
> Project: Geode
> Issue Type: Bug
> Reporter: Jakov Varenina
> Assignee: Jakov Varenina
> Priority: Major
> Labels: needsTriage, pull-request-available
> Fix For: 1.15.0
>
>
> We have observed that sometimes the "create region" command executes
> successfully during period when servers restart even though region is already
> available in the cluster configuration. When this happens, cluster
> configuration contains a duplicated region and servers throw the exception
> *org.apache.geode.cache.RegionExistsException* when restarted again:
> {code:java}
> Exception in thread "main" org.apache.geode.cache.CacheXmlException: While
> parsing XML, caused by org.xml.sax.SAXException: A CacheException was thrown
> while parsing XML.
> org.apache.geode.cache.RegionExistsException: /regionTest
> at
> org.apache.geode.internal.cache.xmlcache.CacheXmlParser.parse(CacheXmlParser.java:267)
> at
> org.apache.geode.internal.cache.GemFireCacheImpl.loadCacheXml(GemFireCacheImpl.java:4119)
> at
> org.apache.geode.internal.cache.ClusterConfigurationLoader.applyClusterXmlConfiguration(ClusterConfigurationLoader.java:208)
> at
> org.apache.geode.internal.cache.GemFireCacheImpl.applyJarAndXmlFromClusterConfig(GemFireCacheImpl.java:1426)
> at
> org.apache.geode.internal.cache.GemFireCacheImpl.initialize(GemFireCacheImpl.java:1391)
> at
> org.apache.geode.internal.cache.InternalCacheBuilder.create(InternalCacheBuilder.java:191)
> at
> org.apache.geode.internal.cache.InternalCacheBuilder.create(InternalCacheBuilder.java:158)
> at
> org.apache.geode.cache.CacheFactory.create(CacheFactory.java:142)
> at
> org.apache.geode.distributed.internal.DefaultServerLauncherCacheProvider.createCache(DefaultServerLauncherCacheProvider.java:52)
> at
> org.apache.geode.distributed.ServerLauncher.createCache(ServerLauncher.java:892)
> at
> org.apache.geode.distributed.ServerLauncher.start(ServerLauncher.java:807)
> at
> org.apache.geode.distributed.ServerLauncher.run(ServerLauncher.java:737)
> at
> org.apache.geode.distributed.ServerLauncher.main(ServerLauncher.java:256)
> Caused by: org.xml.sax.SAXException: A CacheException was thrown while
> parsing XML.
> {code}
> CreateRegionCommand checks whether there is already an existing region using
> the DistributedRegionMXBean service. This service is unreliable during
> restarts, as it takes some time for the locator to accumulate this
> information. So during the startup of the servers locator will send
> CreateRegionFunction to servers since it couldn't detect that region already
> exists using the DistributedRegionMXBean service. In most scenarios, the
> server will reject that function. The only case the server will execute the
> function is when using the local cache.xml configuration in addition to the
> cluster configuration. It seems that processing local cache.xml creates a
> time gap on the server that will accept CreateRegionFunction, although the
> region is already available in the cluster configuration.
> Solution:
> In addition to checks done against the DistributedRegionMXBean information,
> do the same checks against cluster configuration (if used) stored in
> locators. This way, the "create region" command is rejected immediately by
> the locator instead of later by the servers.
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