s1monw commented on issue #1397: LUCENE-9304: Refactor DWPTPool to pool DWPT directly URL: https://github.com/apache/lucene-solr/pull/1397#issuecomment-609778263 > Have we changed the behavior of thread affinity (which DWPT an indexing thread will pull to index a new document), or of flushing (e.g., we still hard stall incoming indexing threads if flushing cannot keep up due to slow IO device)? It looks like we have not but I wanted to confirm. no we haven't. I changed the locking semantics slightly in DWPTPool to move to tryLock when we get a new DWPT but that shouldn't make any difference in terms of thread affinity.
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