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https://issues.apache.org/jira/browse/SOLR-9536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504829#comment-15504829
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Hoss Man commented on SOLR-9536:
--------------------------------
pretty sure the code in SOLR-7374 introduced this NPE
> OldBackupDirectory timestamp init bug causes NPEs from SnapShooter?
> -------------------------------------------------------------------
>
> Key: SOLR-9536
> URL: https://issues.apache.org/jira/browse/SOLR-9536
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
>
> On IRC, a 6.2.0 user reported getting an NPE from
> SnapShooter.deleteOldBackups L244, with the only other frame of the
> stacktrace being {{lambda$createSnapAsync$1}} L196 (it was a screenshot, not
> text easily cut/paste here)
> The problematic L244 is...
> {code}
> if (obd.getTimestamp().isPresent()) {
> {code}
> ..and i believe the root of the issue is that while {{getTimestamp()}} is
> declared to return an {{Optional<Date>}}, there is no guarantee that the
> {{Optional}} instance is itself non-null...
> {code}
> private Optional<Date> timestamp;
> public OldBackupDirectory(URI basePath, String dirName) {
> this.dirName = Preconditions.checkNotNull(dirName);
> this.basePath = Preconditions.checkNotNull(basePath);
> Matcher m = dirNamePattern.matcher(dirName);
> if (m.find()) {
> try {
> this.timestamp = Optional.of(new
> SimpleDateFormat(SnapShooter.DATE_FMT, Locale.ROOT).parse(m.group(1)));
> } catch (ParseException e) {
> this.timestamp = Optional.empty();
> }
> }
> }
> {code}
> Allthough i'm not 100% certain, I believe the way the user was triggering
> this bug was by configuring classic replication configured with something
> like {{<str name="replicateAfter">commit</str>}} -- so that usage may be
> neccessary to trigger the exception?
> Alternatively: perhaps this exception gets logged the *first* time anyone
> tries to use any code that involves SnapShooter -- and after that a timestamp
> file *is* created and teh problem neer manifests itself again?
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