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https://issues.apache.org/jira/browse/SOLR-12294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16491513#comment-16491513
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Mark Miller commented on SOLR-12294:
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Well we have to do something or it breaks proper IDE integration, eclipse
doesn't behave right, I'm not sure about intellij. I can't work properly with
eclipse if the project has an error in it. If it can't be worked around in what
you did, we have to work around it with our IDE support. Just breaking proper
support for an IDE knowingly is not an option.
> System collection - Lazy loading mechanism not working for custom
> UpdateProcessors
> ----------------------------------------------------------------------------------
>
> Key: SOLR-12294
> URL: https://issues.apache.org/jira/browse/SOLR-12294
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: UpdateRequestProcessors
> Affects Versions: 7.3
> Reporter: Johannes Brucher
> Assignee: Noble Paul
> Priority: Critical
> Attachments: no_active_replica_available.png, schema.xml,
> solrconfig.xml, update-processor-0.0.1-SNAPSHOT.jar
>
>
> Hi all,
> I'm facing an issue regarding custom code inside a .system-collection and
> starting up a Solr Cloud cluster.
> I thought, like its stated in the documentation, that in case using the
> .system collection custom code is lazy loaded, because it can happen that a
> collection that uses custom code is initialized before the .system collection
> is up and running.
> I did all the necessary configuration and while debugging, I can see that the
> custom code is wrapped via a PluginBag$LazyPluginHolder. So far its seems
> good, but I still get Exceptions when starting the Solr Cloud with the
> following errors:
> SolrException: Blob loading failed: .no active replica available for .system
> collection...
> In my case I'm using custom code for a couple of UpdateProcessors. So it
> seems, that this lazy mechanism is not working well for UpdateProcessors.
> Inside the calzz LazyPluginHolder the comment says:
> "A class that loads plugins Lazily. When the get() method is invoked the
> Plugin is initialized and returned."
> When a core is initialized and you have a custom UpdateProcessor, the
> get-method is invoked directly and the lazy loading mechanism tries to get
> the custom class from the MemClassLoader, but in most scenarios the system
> collection is not up and the above Exception is thrown...
> So maybe it’s the case that for UpdateProcessors while initializing a core,
> the routine is not implemented optimal for the lazy loading mechanism?
>
> Here are the steps to reproduce the issue:
> # Unpack solr 7.3.0
> 1.1 Add SOLR_OPTS="$SOLR_OPTS -Denable.runtime.lib=true" to solr.in.sh
> 1.2 Start Solr with -c option
> # Setup .system collection:
> 2.1 Upload custom test jar --> curl -X POST -H 'Content-Type:
> application/octet-stream' --data-binary @<path to custom
> jar>/update-processor-0.0.1-SNAPSHOT.jar http://<your
> solr>/solr/.system/blob/test_blob
> 2.2 Alter maxShardsPerNode -->
> .../admin/collections?action=MODIFYCOLLECTION&collection=.system&maxShardsPerNode=2
> 2.2 Add Replica to .system collection -->
> .../admin/collections?action=ADDREPLICA&collection=.system&shard=shard1
> # Setup test collection:
> 3.1 Upload test conf to ZK --> ./zkcli.sh -zkhost <your ZK host> -cmd
> upconfig -confdir <your config dir> -confname test_conf
> 3.2 Create a test1 collection with commented UP-chain inside solrconfig.xml
> via Admin UI
> 3.3 Add blob to test collection --> curl http://<your
> Solr>/solr/test1/config -H 'Content-type:application/json' -d
> '\{"add-runtimelib": { "name":"test_blob", "version":1 }}'
> 3.4 Uncomment the UP-chain and upload test-conf again --> ./zkcli.sh -zkhost
> <your ZK host> -cmd upconfig -confdir <your config dir> -confname test_conf
> 3.5 Reload test1 collection
> 3.6 Everything should work as expected now (no erros are shown)
> # Restart SOLR
> 4.1 Now you can see: SolrException: Blob loading failed: No active replica
> available for .system collection
> Expected: The lazy loading mechanism should work for UpdateProcessors inside
> core init routine, but it isn't due to above Exception.
> Sometimes you are lucky and the test1 collection will be initialize after the
> .system collection. But in ~90% of the time this isn't the case...
> Let me know if you need further details here,
>
> Johannes
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