mikemccand commented on a change in pull request #637: LUCENE-8754: Prevent
ConcurrentModificationException in SegmentInfo
URL: https://github.com/apache/lucene-solr/pull/637#discussion_r273119818
##########
File path:
lucene/core/src/java/org/apache/lucene/codecs/lucene50/Lucene50PostingsFormat.java
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@@ -456,7 +456,11 @@ public String toString() {
@Override
public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws
IOException {
PostingsWriterBase postingsWriter = new Lucene50PostingsWriter(state);
- state.segmentInfo.putAttribute(MODE_KEY, fstLoadMode.name());
+ final String previous = state.segmentInfo.putAttribute(MODE_KEY,
fstLoadMode.name());
+ if (previous != null && previous.equals(fstLoadMode.name()) == false) {
+ throw new IllegalStateException("found existing value for " + MODE_KEY +
" for segment: " + state.segmentInfo.name +
Review comment:
It's a little spooky that this method throws exception if you try to set the
attribute to a different value than it was set before, but then does leave the
new value set in the attributes?
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