Mike Drob created SOLR-10525:
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Summary: Stacked recovery requests can interfere with one another
Key: SOLR-10525
URL: https://issues.apache.org/jira/browse/SOLR-10525
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: SolrCloud
Reporter: Mike Drob
https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/update/DefaultSolrCoreState.java#L300-L310
Two issues with this code:
{code}
boolean locked = recoveryLock.tryLock();
try {
if (!locked) {
if (recoveryWaiting.get() > 0) { // line 1
return;
}
recoveryWaiting.incrementAndGet(); // line 2
} else {
recoveryWaiting.incrementAndGet();
cancelRecovery(); // line 3
}
{code}
The {{cancelRecovery}} on line 3 call will only hit when there are no
recoveries to actually cancel (since we got the lock that means there are no
recoveries in progress). Instead it should be moved either to the either branch
of the if, or outside after the if since we know we will be running a recovery
at that point.
This code doesn't always prevent multiple requests from stacking. If there is a
recovery running, but no recoveries currently waiting, multiple requests can
check the count at line 1 before any of them will increment the count at line 2
and thus all of them will hit the increment.
I don't have specific tests for this, but it's causing failures for me on my
SOLR-9555 work in progress.
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