Hi Fabian, In my case, Since it is stream processing, after that error , that task manager stuck and not taking any new messages. Can you let me know how many task managers can I run in 8 core x 32GB machine.? I am using Heap size as 4096 for each task manager.
Thanks [Verizon]<http://www.verizon.com/> Kanagaraj Vengidasamy RTCI 7701 E Telecom PKWY Temple Terrace, FL 33637 O 813.978.4372 | M 813.455.9757 <http://www.facebook.com/verizon> [Twitter] <http://twitter.com/verizon> [LinkedIn] <http://www.linkedin.com/company/verizon> From: Fabian Hueske [mailto:fhue...@gmail.com] Sent: Tuesday, December 27, 2016 2:53 PM To: user@flink.apache.org Cc: Ufuk Celebi Subject: Re: [E] writeBufferLowWaterMark cannot be greater than writeBufferHighWaterMark error Hi, I reproduced the issue with Flink 1.1.4 and the 1.2.0 release branch. The WARN log statement and the IllegalArgumentException are thrown by Netty. Not sure what the implications are. My batch jobs finished successfully, so maybe the bad configuration options are just ignored. Would be good to check this though. Thanks, Fabian 2016-12-27 16:10 GMT+01:00 <kanagaraj.vengidas...@verizon.com<mailto:kanagaraj.vengidas...@verizon.com>>: Thanks Fabian, For default 65536 also got the same error . That is the reason increased to see it is helping or not. Thanks [Verizon]<http://www.verizon.com/> Kanagaraj Vengidasamy RTCI 7701 E Telecom PKWY Temple Terrace, FL 33637 O 813.978.4372<tel:(813)%20978-4372> | M 813.455.9757<tel:(813)%20455-9757> <http://www.facebook.com/verizon> [Twitter] <http://twitter.com/verizon> [LinkedIn] <http://www.linkedin.com/company/verizon> From: Fabian Hueske [mailto:fhue...@gmail.com<mailto:fhue...@gmail.com>] Sent: Tuesday, December 27, 2016 10:01 AM To: user@flink.apache.org<mailto:user@flink.apache.org> Cc: Ufuk Celebi Subject: Re: [E] writeBufferLowWaterMark cannot be greater than writeBufferHighWaterMark error Hi Kanagaraj, I would assume that the issue is caused by this configuration parameter: taskmanager.memory.segment-size: 131072 I think the maximum possible value given Netty's "writeBufferHighWaterMark" parameter is 65536. There might be a way to tune Netty's parameters but I don't know how to do that. Maybe Ufuk (in CC) knows better. Is there any particular reason why want to increase the network buffer size instead of keeping the default? Did you find that the default parameter gives insufficient performance? Best, Fabian 2016-12-26 20:52 GMT+01:00 <kanagaraj.vengidas...@verizon.com<mailto:kanagaraj.vengidas...@verizon.com>>: Hi, I am getting writeBufferLowWaterMark cannot be greater than writeBufferHighWaterMark error frequently ... and those task managers not processing messages after that error. What could be wrong in my configuration? What I need to do to avoid this error.? Have 8x32 VM's - 8 machines ( running 35 task managers - each one has 8 slots) taskmanager.heap.mb: 4096 taskmanager.numberOfTaskSlots: 8 taskmanager.network.numberOfBuffers: 22000 taskmanager.memory.segment-size: 131072 2016-12-26 14:26:06,548| |WARN io.netty.bootstrap.ServerBootstrap - Failed to set a channel option: [id: 0xf1ef59e6, /138.83.31.4:60812<http://138.83.31.4:60812> => /138.83.31.9:41304<http://138.83.31.9:41304>] java.lang.IllegalArgumentException: writeBufferLowWaterMark cannot be greater than writeBufferHighWaterMark (65536): 131073 at io.netty.channel.DefaultChannelConfig.setWriteBufferLowWaterMark(DefaultChannelConfig.java:334) at io.netty.channel.socket.DefaultSocketChannelConfig.setWriteBufferLowWaterMark(DefaultSocketChannelConfig.java:332) at io.netty.channel.socket.DefaultSocketChannelConfig.setWriteBufferLowWaterMark(DefaultSocketChannelConfig.java:35) at io.netty.channel.DefaultChannelConfig.setOption(DefaultChannelConfig.java:183) at io.netty.channel.socket.DefaultSocketChannelConfig.setOption(DefaultSocketChannelConfig.java:121) at io.netty.bootstrap.ServerBootstrap$ServerBootstrapAcceptor.channelRead(ServerBootstrap.java:238) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847) at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:93) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111) at java.lang.Thread.run(Thread.java:745) Thanks Kanagaraj Vengidasamy RTCI 7701 E Telecom PKWY Temple Terrace, FL 33637 O 813.978.4372<tel:(813)%20978-4372> | M 813.455.9757<tel:(813)%20455-9757>
