[jira] [Updated] (SOLR-8323) Add CollectionWatcher API to ZkStateReader

["Alan Woodward (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-8323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Woodward updated SOLR-8323:
--------------------------------
    Attachment: SOLR-8323.patch

Patch outlining the basic idea.

This adds two new interfaces, CollectionStateWatcher and CollectionStatePredicate.  The first can be registered for a particular collection with ZkStateReader and is called when the state of that collection changes (as determined by the internal watcher of that collection's state.json node).  The second is used in a new ZkStateReader.waitForState() method, and is called on a state change to see if the state of a collection matches a predicate.  There are also forwarding methods on CloudSolrClient for use by SolrJ clients, and a couple of helper methods on DocCollection and Replica to easily check for collection liveness.

The new interfaces lend themselves nicely to use as Java 8 functional interfaces, and the TestCollectionStateWatchers test demonstrate both lambdas and method references here.

This should make it easy to replace some of the helper methods (eg waitForThingsToLevelOut, waitForRecoveriesToFinish) in our tests with methods available to SolrJ.

A caveat: this is only implemented for collections with their own state.json.  I think it should be relatively easy to extend it to stateformat=1 collections as well if people think that's worth it.

> Add CollectionWatcher API to ZkStateReader
> ------------------------------------------
>
>                 Key: SOLR-8323
>                 URL: https://issues.apache.org/jira/browse/SOLR-8323
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: Trunk
>            Reporter: Alan Woodward
>         Attachments: SOLR-8323.patch
>
>
> An API to watch for changes to collection state would be a generally useful thing, both internally and for client use.



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