Andrey Kudryavtsev created SOLR-11474:
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Summary: Endless loop and OOM in PeerSync
Key: SOLR-11474
URL: https://issues.apache.org/jira/browse/SOLR-11474
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Andrey Kudryavtsev
After problem discussed in SOLR-11459, I restarted cluster and got OOM on
start.
PeerSync#handleVersionsWithRanges contains this logic:
{code}
while (otherUpdatesIndex >= 0) {
// we have run out of ourUpdates, pick up all the remaining versions from
the other versions
if (ourUpdatesIndex < 0) {
String range = otherVersions.get(otherUpdatesIndex) + "..." +
otherVersions.get(0);
rangesToRequest.add(range);
totalRequestedVersions += otherUpdatesIndex + 1;
break;
}
// stop when the entries get old enough that reorders may lead us to see
updates we don't need
if (!completeList && Math.abs(otherVersions.get(otherUpdatesIndex)) <
ourLowThreshold) break;
if (ourUpdates.get(ourUpdatesIndex).longValue() ==
otherVersions.get(otherUpdatesIndex).longValue()) {
ourUpdatesIndex--;
otherUpdatesIndex--;
} else if (Math.abs(ourUpdates.get(ourUpdatesIndex)) <
Math.abs(otherVersions.get(otherUpdatesIndex))) {
ourUpdatesIndex--;
} else {
long rangeStart = otherVersions.get(otherUpdatesIndex);
while ((otherUpdatesIndex < otherVersions.size())
&& (Math.abs(otherVersions.get(otherUpdatesIndex)) <
Math.abs(ourUpdates.get(ourUpdatesIndex)))) {
otherUpdatesIndex--;
totalRequestedVersions++;
}
// construct range here
rangesToRequest.add(rangeStart + "..." +
otherVersions.get(otherUpdatesIndex + 1));
}
}
{code}
If at some point there will be
{code} ourUpdates.get(ourUpdatesIndex) = -otherVersions.get(otherUpdatesIndex)
{code}
loop will never end. It will same string again and again into
{{rangesToRequest}} until process runs out of memory.
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