Hi, May be a thread dump and a heap dump can help to find where and why this request is blocked ? May be just by finding this thread in the Solr console, you can see where the thread is blocked ?
Regards Dominique Le dim. 18 déc. 2022 à 09:10, Satya Nand <[email protected]> a écrit : > Pinging on this thread again to bring it to the top. > > Any idea why one request is stuck for hours in solr cloud.? > > On Fri, Dec 9, 2022 at 3:35 PM Satya Nand <[email protected]> > wrote: > > > Hi Ere, > > > > We tried executing this request again and it didn't take any time. So it > > is not repeatable. average response time of all the queries around this > > period was only approx 100-200 ms. > > > > This was a group=true request where we get 14 groups and 5 results per > > group. So no deep pagination. > > > > On Fri, Dec 9, 2022 at 2:04 PM Ere Maijala <[email protected]> > > wrote: > > > >> Hi, > >> > >> Are the same requests sometimes stalling and sometimes fast, or is it > >> some particular queries that take hours? > >> > >> There are some things you should avoid with SolrCloud, and deep paging > >> (i.e. a large number for the start or rows parameter) is a typical issue > >> (see e.g. https://yonik.com/solr/paging-and-deep-paging/ for more > >> information). > >> > >> Best, > >> Ere > >> > >> Satya Nand kirjoitti 8.12.2022 klo 13.27: > >> > Hi, > >> > > >> > Greetings for the day, > >> > > >> > We are facing a strange problem in Solr cloud where a few requests are > >> > taking hours to complete. Some requests return with a 0 status code > and > >> > some with a 500 status code. The recent request took more than 5 hours > >> to > >> > complete with only a 9k results count. > >> > > >> > > >> > These queries create problems in closing old searchers, Some times > >> there > >> > are 3-4 searchers where one is a new searcher and the others are just > >> stuck > >> > because a few queries are tracking hours. Finally, the application > slows > >> > down horribly, and the load increases. > >> > > >> > I have downloaded the stack trace of the affected node and tried to > >> analyze > >> > this stack trace online. but I couldn't get many insights from it. > >> > . > >> > > >> > Stack Trace: > >> > > >> > > >> > https://fastthread.io/my-thread-report.jsp?p=c2hhcmVkLzIwMjIvMTIvOC9sb2dzLnR4dC0tMTAtNTUtMzA=&; > >> > > >> > JVM Settings: We are using Parallel GC, can this be causing this much > >> log > >> > pause? > >> > > >> > -XX:+UseParallelGC > >> > -XX:-OmitStackTraceInFastThrow > >> > -Xms12g > >> > -Xmx12g > >> > -Xss256k > >> > > >> > What more we can check here to find the root cause and prevent this > from > >> > happening again? > >> > Thanks in advance > >> > > >> > >> -- > >> Ere Maijala > >> Kansalliskirjasto / The National Library of Finland > >> > > >
