Hanyakubin opened a new issue, #12209: URL: https://github.com/apache/lucene/issues/12209
### Description We use Apache James to provide voice visual mail for iPhone users and Lucene module is used in James to store nessecary information for index search. But the CPU usage of James server is continuously increasing like this:  Below is the command sequence from iPhone: - SELECT INBOX - UID SEARCH 1:* NOT DELETED - UID SEARCH 1:* UNSEEN - UID STORE [uid_1] +FLAGS.SILENT (\Seen)) - UID STORE [uid_2] +FLAGS.SILENT (\Seen)) - ...... - LOGOUT After several tests, we think maybe there are some problems in the implement of SEARCH command, so we change the search query command request to - UID SEARCH UID ALL instead of 1:* NOT/UN~ in our test environment. Then the CPU usage became stable like this:  We checked sourcecode and found there is a block in James like below: `public Flux<MessageUid> search(SearchQuery query, MailboxSession mailboxSession) throws MailboxException {` ` if (query.equals(LIST_ALL_QUERY) || query.equals(LIST_FROM_ONE)) {` ` return listAllMessageUids(mailboxSession);` ` }` ` return index.search(mailboxSession, getMailboxEntity(), query);` `}` When the query is LIST_ALL_QUERY or LIST_FROM_ONE, it will go into the if block, not using index search of Lucene and the CPU usage is stable. Otherwise, in the other query cases when index.search method being called, the CPU usage will increase. The question is why. Is there some performance problem in Lucene, or this issue can be resolved by correct configuration? ### Version and environment details James: 3.6.0 Lucene: 3.6.2 JVM: OpenJDK 64-Bit Server VM OS: CentOS7.2 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org
