I assume you recompiled the jar file? re-using the same one compiled against 5x 
is unsupported, nobody will be able to help until you recompile.

Once you’ve done that, if you still have the problem you need to take a thread 
dump to see if your custom code is leaking threads, that’s my number one 
suspect.

Best,
Erick

> On Mar 6, 2020, at 07:36, Srinivas Kashyap <srini...@bamboorose.com.invalid> 
> wrote:
> 
> Hi Erick,
> 
> We have custom code which are schedulers to run delta imports on our cores 
> and I have added that custom code as a jar and I have placed it on 
> server/solr-webapp/WEB-INF/lib. Basically we are fetching the JNDI datasource 
> configured in the jetty.xml(Oracle) and creating connection object. And after 
> that in the finally block we are closing it too.
> 
> Never faced this issue while we were in solr5.2.1 version though. The same 
> jar was placed there too.
> 
> Thanks,
> Srinivas
> 
> On 06-Mar-2020 8:55 pm, Erick Erickson <erickerick...@gmail.com> wrote:
> This one can be a bit tricky. You’re not running out of overall memory, but 
> you are running out of memory to allocate stacks. Which implies that, for 
> some reason, you are creating a zillion threads. Do you have any custom code?
> 
> You can take a thread dump and see what your threads are doing, and you don’t 
> need to wait until you see the error. If you take a thread dump my guess is 
> you’ll see the number of threads increase over time. If that’s the case, and 
> if you have no custom code running, we need to see the thread dump.
> 
> Best,
> Erick
> 
>> On Mar 6, 2020, at 05:54, Srinivas Kashyap <srini...@bamboorose.com.invalid> 
>> wrote:
>> 
>> Hi All,
>> 
>> I have recently upgraded solr to 8.4.1 and have installed solr as service in 
>> linux machine. Once I start my service, it will be up for 15-18hours and 
>> suddenly stops without us shutting down. In solr.log I found below error. 
>> Can somebody guide me what values should I be increasing in Linux machine?
>> 
>> Earlier, open file limit was not set and now I have increased. Below are my 
>> system configuration for solr:
>> 
>> JVM memory: 8GB
>> RAM: 32GB
>> Open file descriptor count: 500000
>> 
>> Ulimit -v - unlimited
>> Ulimit -m - unlimited
>> 
>> 
>> ERROR STACK TRACE:
>> 
>> 2020-03-06 12:08:03.071 ERROR (qtp1691185247-21) [   x:product] 
>> o.a.s.s.HttpSolrCall null:java.lang.RuntimeException: 
>> java.lang.OutOfMemoryError: unable to create new native thread
>>       at 
>> org.apache.solr.servlet.HttpSolrCall.sendError(HttpSolrCall.java:752)
>>       at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:603)
>>       at 
>> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:419)
>>       at 
>> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:351)
>>       at 
>> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)
>>       at 
>> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
>>       at 
>> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
>>       at 
>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
>>       at 
>> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1711)
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
>>       at 
>> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1347)
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
>>       at 
>> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
>>       at 
>> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1678)
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
>>       at 
>> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1249)
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
>>       at 
>> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220)
>>       at 
>> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:152)
>>       at 
>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
>>       at 
>> org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
>>       at 
>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
>>       at org.eclipse.jetty.server.Server.handle(Server.java:505)
>>       at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:370)
>>       at 
>> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267)
>>       at 
>> org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
>>       at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
>>       at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
>>       at 
>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
>>       at 
>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
>>       at 
>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
>>       at 
>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
>>       at 
>> org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
>>       at 
>> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:781)
>>       at 
>> org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:917)
>>       at java.lang.Thread.run(Thread.java:748)
>> Caused by: java.lang.OutOfMemoryError: unable to create new native thread
>>       at java.lang.Thread.start0(Native Method)
>>       at java.lang.Thread.start(Thread.java:717)
>>       at 
>> org.apache.solr.handler.dataimport.DataImporter.runAsync(DataImporter.java:466)
>>       at 
>> org.apache.solr.handler.dataimport.DataImportHandler.handleRequestBody(DataImportHandler.java:205)
>>       at 
>> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:211)
>>       at org.apache.solr.core.SolrCore.execute(SolrCore.java:2596)
>>       at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:799)
>>       at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:578)
>>       ... 36 more
>> 
>> 
>> 
>> 
>> java.lang.OutOfMemoryError: unable to create new native thread
>>       at java.lang.Thread.start0(Native Method) ~[?:1.8.0_242]
>>       at java.lang.Thread.start(Thread.java:717) ~[?:1.8.0_242]
>>       at 
>> org.apache.solr.handler.dataimport.DataImporter.runAsync(DataImporter.java:466)
>>  ~[?:?]
>>       at 
>> org.apache.solr.handler.dataimport.DataImportHandler.handleRequestBody(DataImportHandler.java:205)
>>  ~[?:?]
>>       at 
>> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:211)
>>  ~[?:?]
>>       at org.apache.solr.core.SolrCore.execute(SolrCore.java:2596) ~[?:?]
>>       at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:799) 
>> ~[?:?]
>>       at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:578) 
>> ~[?:?]
>>       at 
>> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:419)
>>  ~[?:?]
>>       at 
>> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:351)
>>  ~[?:?]
>>       at 
>> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)
>>  ~[jetty-servlet-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540) 
>> ~[jetty-servlet-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) 
>> ~[jetty-security-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1711)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1347)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480) 
>> ~[jetty-servlet-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1678)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1249)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:152)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
>>  ~[jetty-rewrite-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
>>  ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at org.eclipse.jetty.server.Server.handle(Server.java:505) 
>> ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:370) 
>> ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267) 
>> ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
>>  ~[jetty-io-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) 
>> ~[jetty-io-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) 
>> ~[jetty-io-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
>>  ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
>>  ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
>>  ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
>>  ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
>>  ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:781)
>>  ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at 
>> org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:917)
>>  ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610]
>>       at java.lang.Thread.run(Thread.java:748) [?:1.8.0_242]
>> 
>> 
>> 
>> 
>> Thanks and Regards,
>> Srinivas Kashyap
>> 
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