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https://issues.apache.org/jira/browse/SOLR-17149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gerlowski reassigned SOLR-17149:
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Assignee: Jason Gerlowski
> Cannot backup/restore large collection.
> ---------------------------------------
>
> Key: SOLR-17149
> URL: https://issues.apache.org/jira/browse/SOLR-17149
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 9.4
> Reporter: Pierre Salagnac
> Assignee: Jason Gerlowski
> Priority: Major
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
>
> There is a regression introduced in version 9.4 with SOLR-16879.
>
> We cannot backup collections with more than 10 shards per node. The thread
> pool is rejecting new tasks with following error:
> {noformat}
> SolrException: Could not backup all shards
> Task
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$$Lambda...
> rejected from
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor[Running,
> pool size = 5, active threads = 5, queued tasks = 5, completed tasks = 30]"
> {noformat}
> {{expensiveExecutor}} thread pool executor is
> [created|https://github.com/apache/solr/blob/releases/solr/9.4.1/solr/solrj/src/java/org/apache/solr/common/util/ExecutorUtil.java#L170-L174]
> with 5 max threads and bounded queue of the same size (5), so the total
> number of tasks is limited to 10 and all the other tasks are immediately
> rejected.
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