msfroh commented on pull request #2088:
URL: https://github.com/apache/lucene-solr/pull/2088#issuecomment-730361695
> I'm suspicious that this is safe to do. What if another thread is calling
addDocument at the same time?
As long as `FieldNumbers.clear()` is only called from
`IndexWriter.deleteAll()`, my understanding is that the safety is provided by
the `try (Closeable finalizer = docWriter.lockAndAbortAll()) {` block, which (I
think) guarantees that any concurrent indexing is blocked until the lock is
released.
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