Hi Enrico,
Thanks for the reply. 1. We are using NIO based stack, not Netty based yet. 2. Yes, here are some metrics on the client side. 3.6: throughput: 7K, failure: 81215228, Avg Latency: 57ms, Max Latency 31s 3.4: throughput: 15k, failure: 0, Avg Latency: 30ms, Max Latency: 1.6s 3. Yes, the JVM and zoo.cfg config are the exact same 10G of Heap 13G of Memory 5 Participante 5 Observere Client session timeout: 3000ms Server min session time: 4000ms 4. Yes, there are two types of WARN logs and many “Expiring session” INFO log 2021-02-15 22:04:36,506 [myid:4] - WARN [NIOWorkerThread-7:NIOServerCnxn@365] - Unexpected exception EndOfStreamException: Unable to read additional data from client, it probably closed the socket: address = /100.108.63.116:43366, session = 0x400189fee9a000b at org.apache.zookeeper.server.NIOServerCnxn.handleFailedRead(NIOServerCnxn.java:164) at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:327) at org.apache.zookeeper.server.NIOServerCnxnFactory$IOWorkRequest.doWork(NIOServerCnxnFactory.java:522) at org.apache.zookeeper.server.WorkerService$ScheduledWorkRequest.run(WorkerService.java:154) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834) 2021-02-15 22:05:14,428 [myid:4] - WARN [SyncThread:4:SyncRequestProcessor@188] - Too busy to snap, skipping 2021-02-15 22:01:51,427 [myid:4] - INFO [SessionTracker:ZooKeeperServer@610] - Expiring session 0x400189fee9a001e, timeout of 4000ms exceeded 5. Yes we upgrade both the client and the server to 3.6. Actually, the issue happened with the combinations of 3.4 client and 3.6 server 3.6 client and 3.6 server Please let me know if you need any additional info. Thanks, Li On Mon, Feb 15, 2021 at 1:44 PM Li Wang <li4w...@gmail.com> wrote: > Hi Enrico, > > Thanks for the reply. > > 1. We are using direct NIO based stack, not Netty based yet. > 2. Yes, on the client side, here are the metrics > > 3.6: > > > > > On Mon, Feb 15, 2021 at 10:44 AM Enrico Olivelli <eolive...@gmail.com> > wrote: > >> IIRC The main difference is about the switch to Netty 4 and about using >> more DirectMemory. Are you using the Netty based stack? >> >> Apart from that macro difference there have been many many changes since >> 3.4. >> >> Do you have some metrics to share? >> Are the JVM configurations and zoo.cfg configuration equals to each >> other? >> >> Do you see warnings on the server logs? >> >> Did you upgrade both the client and the server or only the server? >> >> Enrico >> >> >> Il Lun 15 Feb 2021, 18:30 Li Wang <li4w...@gmail.com> ha scritto: >> >> > Hi, >> > >> > We want to upgrade from 3.4.14 to 3.6.2. During the perform/load >> > comparison test, it was found that the performance of 3.6 has been >> > significantly degraded compared to 3.4 for the write operation. Under >> the >> > same load, there was a huge number of SessionExpired and ConnectionLoss >> > errors in 3.6 while no such errors in 3.4. >> > >> > The load testing is 500 concurrent users with a cluster of 5 >> participants >> > and 5 observers. The min session timeout on the server side is 4000ms. >> > >> > I wonder if anyone has seen the same issue and has any insights on what >> > could be the cause of the performance degradation. >> > >> > Thanks >> > >> > Li >> > >> >
