By default, Flink allocates a fraction of 0.7 (taskmanager.memory.fraction) of the free memory (total memory configured via taskmanager.heap.mb minus memory used for network buffers) for its managed memory. An absolute value may be set using taskmanager.memory.size (overrides the fraction parameter). [1] In general, [1] is a good read for how the different memory settings work together.
The 10000 network buffers of size taskmanager.memory.segment-size (default: 32k) will this remove 320MB from your taskmanager.heap.mb (which in your example is set to 563GB?!) and therefore do not affect the managed memory size much. Whether the size used by the JVM is preallocated--and thus immediately visible--depends on taskmanager.memory.preallocate. But actually what are trying to fix? Is your node flushing data to disk yet? Or has it just not accumulated that much operator state yet? Nico [1] https://ci.apache.org/projects/flink/flink-docs-release-1.3/setup/ config.html#managed-memory On Monday, 29 May 2017 19:09:55 CEST Sathi Chowdhury wrote: > For got to mention I am running 10 slots in each machine and > taskmanager.network.numberOfBuffers: 10000 Is there a scope of improving > memory usage? > > From: Sathi Chowdhury > <[email protected]<mailto:[email protected]>> Date: > Monday, May 29, 2017 at 9:55 AM > To: "[email protected]<mailto:[email protected]>" > <[email protected]<mailto:[email protected]>> Subject: How can I > increase Flink managed memory? > > Hello Flink Dev and Community > I have 5 task managers each tie 64 GB of memory > I am running flink on yarn with task manager heap taskmanager.heap.mb: > 563200 Link still shows that it is using about 21 GB memory leaving 35 GB > available..how and what can I do to fix it? Please suggest > Thanks > Sathi > =============Notice to Recipient: This e-mail transmission, and any > documents, files or previous e-mail messages attached to it may contain > information that is confidential or legally privileged, and intended for > the use of the individual or entity named above. If you are not the > intended recipient, or a person responsible for delivering it to the > intended recipient, you are hereby notified that you must not read this > transmission and that any disclosure, copying, printing, distribution or > use of any of the information contained in or attached to this transmission > is STRICTLY PROHIBITED. If you have received this transmission in error, > please immediately notify the sender by telephone or return e-mail and > delete the original transmission and its attachments without reading or > saving in any manner. Thank you. ============= =============Notice to > Recipient: This e-mail transmission, and any documents, files or previous > e-mail messages attached to it may contain information that is confidential > or legally privileged, and intended for the use of the individual or entity > named above. If you are not the intended recipient, or a person responsible > for delivering it to the intended recipient, you are hereby notified that > you must not read this transmission and that any disclosure, copying, > printing, distribution or use of any of the information contained in or > attached to this transmission is STRICTLY PROHIBITED. If you have received > this transmission in error, please immediately notify the sender by > telephone or return e-mail and delete the original transmission and its > attachments without reading or saving in any manner. Thank you. > =============
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