+1 to raise a JIRA. There is an easy workaround on the user side by using a recent JVM, but at the same time the change to the code looks safe. Does it affect 6.6? I see there is an ongoing thread about getting 6.6.6 out.
On Mon, Mar 25, 2019 at 5:05 PM Erick Erickson <erickerick...@gmail.com> wrote: > > From the user’s list (thanks to Adam Guthrie and Lukas Weiss) > > Short form: Apparently there’s a java 8 bug that’s the root cause, not fixed > until Java 9: https://bugs.openjdk.java.net/browse/JDK-8129861 > > I have _not_ verified this, but we’ve had sporadic reports (Shawn?) of same. > CommitTracker is the only place in the code that calls newScheduledThreadPool > with 0. > > From what I can tell, this isn’t fixed in Java until 9. > > If the fix is just changing that call to use 1, it’s trivial but would > require a respin of 7.7 to get out in the field. > > Should I raise a JIRA? ‘cause we should be seeing it in Solr 8 and master > too. Although we should be seeing this in Solr 8 too, although it should > disappear in Master when we require Java 11. > > > > ************E-mail below. > Hi, > Apologies, I can’t figure out how to reply to the Solr mailing list. > I just ran across the same high CPU usage issue. I believe it’’s caused by > this commit which was introduced in Solr 7.7.0 > https://github.com/apache/lucene-solr/commit/eb652b84edf441d8369f5188cdd5e3ae2b151434#diff-e54b251d166135a1afb7938cfe152bb5 > There is a bug in JDK versions <=8 where using 0 threads in the > ScheduledThreadPool causes high CPU usage: > https://bugs.openjdk.java.net/browse/JDK-8129861 > Oddly, the latest version > of solr/core/src/java/org/apache/solr/update/CommitTracker.java on > master still uses 0 executors as the default. Presumably most everyone is > using JDK 9 or greater which has the bug fixed, so they don’t experience > the bug. > Feel free to relay this back to the mailing list. > Thanks, > Adam Guthrie > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org > For additional commands, e-mail: dev-h...@lucene.apache.org > -- Adrien --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org
