【发布时间】：2020-12-31 01:53:40
【问题描述】：
我有一个多年前创建的核心，在 Solr 6.x 上正确运行。
我已将 Solr 升级到 7.7.3。我已经启动了 IndexUpgrade 脚本：
/opt/solr/server/solr-webapp/webapp/WEB-INF/lib$ sudo java -cp lucene-core-7.7.3.jar:lucene-backward-codecs-7.7.3.jar org.apache.lucene.index.IndexUpgrader /var/solr/data/hms/data/index/
它默默地运行，所以我的假设是它正确地做了它必须做的事情。
然后我已经升级到 Solr 8.7.0，并启动了脚本：
/opt/solr/server/solr-webapp/webapp/WEB-INF/lib$ sudo java -cp lucene-core-8.7.0.jar:lucene-backward-codecs-8.7.0.jar org.apache.lucene.index.IndexUpgrader /var/solr/data/hms/data/index/
最后一个代码退出并出现此错误：
Exception in thread "main" org.apache.lucene.index.IndexFormatTooOldException: Format version is not supported (resource BufferedChecksumIndexInput(MMapIndexInput(path="/var/solr/data/hms/data/index/segments_asky"))): This index was initially created with Lucene 6.x while the current version is 8.7.0 and Lucene only supports reading the current and previous major versions.. This version of Lucene only supports indexes created with release 7.0 and later.
at org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:322)
at org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:291)
at org.apache.lucene.index.SegmentInfos$1.doBody(SegmentInfos.java:461)
at org.apache.lucene.index.SegmentInfos$1.doBody(SegmentInfos.java:458)
at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:720)
at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:672)
at org.apache.lucene.index.SegmentInfos.readLatestCommit(SegmentInfos.java:463)
at org.apache.lucene.index.DirectoryReader.listCommits(DirectoryReader.java:260)
at org.apache.lucene.index.IndexUpgrader.upgrade(IndexUpgrader.java:158)
at org.apache.lucene.index.IndexUpgrader.main(IndexUpgrader.java:78)
Suppressed: org.apache.lucene.index.CorruptIndexException: checksum passed (58082b0a). possibly transient resource issue, or a Lucene or JVM bug (resource=BufferedChecksumIndexInput(MMapIndexInput(path="/var/solr/data/hms/data/index/segments_asky")))
at org.apache.lucene.codecs.CodecUtil.checkFooter(CodecUtil.java:466)
at org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:434)
... 9 more
这是为什么呢？我做事不正确，即先将索引从 6 升级到 7，然后从 7 升级到 8？如何让我的索引与 Solr 8 一起使用？
【问题讨论】：