zacharymorn commented on a change in pull request #128:
URL: https://github.com/apache/lucene/pull/128#discussion_r696247145



##########
File path: lucene/core/src/java/org/apache/lucene/index/CheckIndex.java
##########
@@ -605,209 +680,103 @@ public Status checkIndex(List<String> onlySegments) 
throws IOException {
     result.newSegments.clear();
     result.maxSegmentName = -1;
 
-    for (int i = 0; i < numSegments; i++) {
-      final SegmentCommitInfo info = sis.info(i);
-      long segmentName = Long.parseLong(info.info.name.substring(1), 
Character.MAX_RADIX);
-      if (segmentName > result.maxSegmentName) {
-        result.maxSegmentName = segmentName;
-      }
-      if (onlySegments != null && !onlySegments.contains(info.info.name)) {
-        continue;
-      }
-      Status.SegmentInfoStatus segInfoStat = new Status.SegmentInfoStatus();
-      result.segmentInfos.add(segInfoStat);
-      msg(
-          infoStream,
-          "  "
-              + (1 + i)
-              + " of "
-              + numSegments
-              + ": name="
-              + info.info.name
-              + " maxDoc="
-              + info.info.maxDoc());
-      segInfoStat.name = info.info.name;
-      segInfoStat.maxDoc = info.info.maxDoc();
-
-      final Version version = info.info.getVersion();
-      if (info.info.maxDoc() <= 0) {
-        throw new RuntimeException("illegal number of documents: maxDoc=" + 
info.info.maxDoc());
-      }
-
-      int toLoseDocCount = info.info.maxDoc();
-
-      SegmentReader reader = null;
-
-      try {
-        msg(infoStream, "    version=" + (version == null ? "3.0" : version));
-        msg(infoStream, "    id=" + 
StringHelper.idToString(info.info.getId()));
-        final Codec codec = info.info.getCodec();
-        msg(infoStream, "    codec=" + codec);
-        segInfoStat.codec = codec;
-        msg(infoStream, "    compound=" + info.info.getUseCompoundFile());
-        segInfoStat.compound = info.info.getUseCompoundFile();
-        msg(infoStream, "    numFiles=" + info.files().size());
-        Sort indexSort = info.info.getIndexSort();
-        if (indexSort != null) {
-          msg(infoStream, "    sort=" + indexSort);
-        }
-        segInfoStat.numFiles = info.files().size();
-        segInfoStat.sizeMB = info.sizeInBytes() / (1024. * 1024.);
-        msg(infoStream, "    size (MB)=" + nf.format(segInfoStat.sizeMB));
-        Map<String, String> diagnostics = info.info.getDiagnostics();
-        segInfoStat.diagnostics = diagnostics;
-        if (diagnostics.size() > 0) {
-          msg(infoStream, "    diagnostics = " + diagnostics);
+    // checks segments sequentially
+    if (executorService == null) {

Review comment:
       Sounds good! I've created a new issue for following up on this 
https://issues.apache.org/jira/browse/LUCENE-10071 




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