Thanks for the voting and comments. @Stephan - The '-XX:MaxDirectMemorySize' value should not include JVM Overhead. Thanks for correction. - 'taskmanager.memory.framework.heap' it heap memory reserved for task executor framework, which can not be allocated to task slots. I think users should be able to configure both how many total java heap memory a task executor should have and how many of the total java heap memory can be allocated to task slots. - Regarding network / shuffle memory, I'm with @Andrey. ATM, this memory pool (derived from "taskmanager.network.memory.[min/max/fraction]") is only used inside NettyShuffleEnvironment as network buffers. There might be other network memory usage outside the shuffle component (as @Zhijiang also suggested), but that is not accounted by this memory pool. This is exactly why I would suggest to change the name from 'network' to 'shuffle'. - I agree that we need very good documentation to explain the memory pools and config options, as well as WebUI to present the memory pool sizes. I would suggest to address these as follow-ups of all the three resource management FLIPs, for better integration.
@Andrey - Agree with the 'shuffle' naming. See above. @Till - My understanding is that Task Off-heap memory accounts for both direct and native memory used by the user code. I'm not sure whether we need another configure option to split it. Given that we only decided (in the discussion thread) to try it out the way we set '-XX:MaxDirectMemorySize' in current design and may switch to other alternatives if it doesn't work out well, I would suggest the same for this one. I suggest that we first try it without the splitting config option, and we can easily add it if it doesn't work well. - Agree that it's really important to have good documentation for this. See above. @Zhijiang - Thanks for the input. My understanding is that 'shuffle memory' is a portion of the task executor memory reserved for the shuffle component. The way shuffle component use these memory (local buffer pool, netty internal memory, etc.) can be different depending on the shuffle implementation. The task executor (outside of the shuffle implementation) should only know the overall memory usage of the shuffle component but no need to understand more details inside the shuffle implementation. Thank you~ Xintong Song On Tue, Sep 3, 2019 at 10:41 PM zhijiang <wangzhijiang...@aliyun.com.invalid> wrote: > Thanks for proposing this FLIP and also +1 on my side. > > @Andrey Zagrebin For the point of "network memory is actually used more > than shuffling", I guess that the component of queryable state is also > using network/netty stack atm, which is outside of shuffling. > In addition, if we only consider the shuffle memory provided by shuffle > service interface, we should not only consider the memory used by local > buffer pool, but also consider the netty internal memory > usages as the overhead, especially we have not the zero-copy improvement > on dowstream read side. This issue might be out of the vote scope, just > think of we have this issue in [1]. :) > > [1] https://issues.apache.org/jira/browse/FLINK-12110 > > Best, > Zhijiang > ------------------------------------------------------------------ > From:Till Rohrmann <trohrm...@apache.org> > Send Time:2019年9月3日(星期二) 15:07 > To:dev <dev@flink.apache.org> > Subject:Re: [VOTE] FLIP-49: Unified Memory Configuration for TaskExecutors > > Thanks for creating this FLIP and starting the vote Xintong. > > +1 for the proposal from my side. > > I agree with Stephan that we might wanna revisit some of the configuration > names. > > If I understood it correctly, then Task Off-heap memory represents the > direct memory used by the user code, right? How would users configure > native memory requirements for the user code? If it is part of Task Off > heap memory, then we need to split it to set -XX:MaxDirectMemorySize > correctly or to introduce another configuration option. > > Given all these configuration options, I can see that users will get > confused quite easily. Therefore, I would like to emphasise that we need a > very good documentation about how to properly configure Flink processes and > which knobs to turn in which cases. > > Cheers, > Till > > On Tue, Sep 3, 2019 at 2:34 PM Andrey Zagrebin <and...@ververica.com> > wrote: > > > Thanks for starting the vote Xintong > > > > Also +1 for the proposed FLIP-49. > > > > @Stephan regarding namings: network vs shuffle. > > My understanding so far was that the network memory is what we basically > > give to Shuffle implementations and default netty implementation uses it > in > > particular mostly for networking. > > Are the network pools used for something else outside of the shuffling > > scope? > > > > best, > > Andrey > > > > On Tue, Sep 3, 2019 at 1:01 PM Stephan Ewen <se...@apache.org> wrote: > > > > > +1 to the proposal in general > > > > > > A few things seems to be a bit put of sync with the latest discussions > > > though. > > > > > > The section about JVM Parameters states that the > > > -XX:MaxDirectMemorySize value is set to Task Off-heap Memory, Shuffle > > > Memory and JVM Overhead. > > > The way I understand the last discussion conclusion is that it is only > > the > > > sum of shuffle memory and user-defined direct memory. > > > > > > I am someone neutral but unsure about is the separation between > > > "taskmanager.memory.framework.heap" and "taskmanager.memory.task.heap". > > > Could that be simply combined under "taskmanager.memory.javaheap"? > > > > > > It might be good to also expose these values somehow in the web UI so > > that > > > users see immediately what amount of memory TMs assume to use for what. > > > > > > I assume config key names and default values might be adjusted over > time > > as > > > we get feedback. > > > - I would keep the network memory under the name > > > "taskmanager.memory.network". Because network memory is actually used > for > > > more than shuffling. Also, the old config key seems good, so why change > > it? > > > > > > One thing to be aware of is that often, the Java Heap is understood as > > > "managed memory" as a whole, because it is managed by the GC not > > explicitly > > > by the user. > > > So we need to make sure that we don't confuse users by speaking of > > managed > > > heap and unmanaged heap. All heap is managed in Java. Some memory is > > > explicitly managed by Flink. > > > > > > Best, > > > Stephan > > > > > > > > > On Mon, Sep 2, 2019 at 3:08 PM Xintong Song <tonysong...@gmail.com> > > wrote: > > > > > > > Hi everyone, > > > > > > > > I'm here to re-start the voting process for FLIP-49 [1], with respect > > to > > > > consensus reached in this thread [2] regarding some new comments and > > > > concerns. > > > > > > > > This voting will be open for at least 72 hours. I'll try to close it > > Sep. > > > > 5, 14:00 UTC, unless there is an objection or not enough votes. > > > > > > > > Thank you~ > > > > > > > > Xintong Song > > > > > > > > > > > > [1] > > > > > > > > > > > > > > https://cwiki.apache.org/confluence/display/FLINK/FLIP-49%3A+Unified+Memory+Configuration+for+TaskExecutors > > > > [2] > > > > > > > > > > > > > > http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/DISCUSS-FLIP-49-Unified-Memory-Configuration-for-TaskExecutors-td31436.html > > > > > > > > On Tue, Aug 27, 2019 at 9:29 PM Xintong Song <tonysong...@gmail.com> > > > > wrote: > > > > > > > > > Alright, then let's keep the discussion in the DISCUSS mailing > > thread, > > > > and > > > > > see whether we need to restart the vote. > > > > > > > > > > Thank you~ > > > > > > > > > > Xintong Song > > > > > > > > > > > > > > > > > > > > On Tue, Aug 27, 2019 at 8:12 PM Till Rohrmann < > trohrm...@apache.org> > > > > > wrote: > > > > > > > > > >> I had a couple of comments concerning the implementation plan. > I've > > > > posted > > > > >> them to the original discussion thread. Depending on the outcome > of > > > this > > > > >> discussion we might need to restart the vote. > > > > >> > > > > >> Cheers, > > > > >> Till > > > > >> > > > > >> On Tue, Aug 27, 2019 at 11:14 AM Xintong Song < > > tonysong...@gmail.com> > > > > >> wrote: > > > > >> > > > > >> > Hi all, > > > > >> > > > > > >> > I would like to start the voting process for FLIP-49 [1], which > is > > > > >> > discussed and reached consensus in this thread [2]. > > > > >> > > > > > >> > This voting will be open for at least 72 hours. I'll try to > close > > it > > > > >> Aug. > > > > >> > 30 10:00 UTC, unless there is an objection or not enough votes. > > > > >> > > > > > >> > Thank you~ > > > > >> > > > > > >> > Xintong Song > > > > >> > > > > > >> > > > > > >> > [1] > > > > >> > > > > > >> > > > > > >> > > > > > > > > > > https://cwiki.apache.org/confluence/display/FLINK/FLIP-49%3A+Unified+Memory+Configuration+for+TaskExecutors > > > > >> > [2] > > > > >> > > > > > >> > > > > > >> > > > > > > > > > > http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/DISCUSS-FLIP-49-Unified-Memory-Configuration-for-TaskExecutors-td31436.html > > > > >> > > > > > >> > > > > > > > > > > > > > > > >
