mikemccand commented on pull request #128:
URL: https://github.com/apache/lucene/pull/128#issuecomment-847885348
OK I ran `CheckIndex`, with this PR, on last night's English Wikipedia
benchmark index:
```
beast3:core[main]$ java -cp
../core/build/libs/lucene-core-9.0.0-SNAPSHOT.jar
org.apache.lucene.index.CheckIndex /l/indices/trunk.nightly.index.prev/index
NOTE: testing will be more thorough if you run java with
'-ea:org.apache.lucene...', so assertions are enabled
Opening index @ /l/indices/trunk.nightly.index.prev/index
Exception in thread "main" java.lang.IllegalArgumentException
at
java.base/java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1295)
at
java.base/java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1217)
at
java.base/java.util.concurrent.Executors.newFixedThreadPool(Executors.java:155)
at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:527)
at org.apache.lucene.index.CheckIndex.doCheck(CheckIndex.java:4036)
at org.apache.lucene.index.CheckIndex.doMain(CheckIndex.java:3920)
at org.apache.lucene.index.CheckIndex.main(CheckIndex.java:3852)
```
I think the issue is that `opts.threadCount` is `0` if you don't explicitly
set the thread count. Can we fix it to default to number of cores on the box,
maybe capped at a maximum (4?
8?), when `CheckIndex` is invoked interactively from the command-line?
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