Pierre Salagnac created SOLR-17149:
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Summary: 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
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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