Is it possible your machine is falling into iowait and that's what's blocking selects?
If this is a Linux box, install sysstat and do: iostat 5 The first response will be an average since startup, and then you'll get 5 second averages. Watch the iowait% figure... if that's over say 10%, that might be your problem. Michael Della Bitta ------------------------------------------------ Appinions 18 East 41st Street, 2nd Floor New York, NY 10017-6271 www.appinions.com Where Influence Isn’t a Game On Thu, Nov 1, 2012 at 9:24 AM, dbabits <dbab...@gmail.com> wrote: > I use Solr 3.6.0 and all selects are blocked during commits. > > This appears to be contrary to all documentation I have seen, quoting from > the "Solr Enterprise.." book: > "No matter how long a commit or optimize command takes, Solr still > executes searches concurrently—there is no read lock." > > I have Master replicating to Slave, once/minute. > Indexing happens to the Master, at a rate of few docs/about every 30 secs > Selects are run against Slave. > > This is the pattern from the Slave log: > > Oct 30, 2012 12:33:23 AM org.apache.solr.core.SolrDeletionPolicy > updateCommits > INFO: newest commit = 1349195567630 > Oct 30, 2012 12:33:42 AM org.apache.solr.core.SolrCore execute > INFO: [core3] webapp=/solr path=/select > > During the 19 seconds that you see between the 2 lines, the /select is > blocked, until the commit is done. > This has nothing to do with the jvm, I'm monitoring the memory and GC stats > with jConsole and log, and they are fine. > > I played with all settings imaginable: commitWithin, commit=true, > useColdSearcher, autoWarming settings from 0 on-nothing helps. > > As soon as I suspend replication (command=disablepoll), everything becomes > fast. > As soon as I enable it - it pretty much becomes useless. > > The problem does not seem to be related to replication, because querying > Master directly exibits the same problem-cannot select while commit is > running. > > The environment is: Solr 3.6.0, RHEL Lunux 5.3.2, 64-bit, 96G RAM, 6 CPU > cores, java 1.6.0_24, ~70 million docs. > > Thanks a lot for your help. > > P.S. this message was originally posted to an old thread discussing the same > problem, I'm reposting new per Erick Erickson's request. > > > > -- > View this message in context: > http://lucene.472066.n3.nabble.com/solr-selects-blocking-on-commit-tp4017525.html > Sent from the Solr - User mailing list archive at Nabble.com.
