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https://issues.apache.org/jira/browse/FLINK-18190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chesnay Schepler closed FLINK-18190.
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Fix Version/s: (was: 1.11.0)
Resolution: Not A Problem
Naturally, if the Flink Memory is fixed then a change in Metaspace must affect
overhead. That things behave differently if Flink Memory is not fixed makes
sense.
> Document implications on derived memory values when configuring meta space
> --------------------------------------------------------------------------
>
> Key: FLINK-18190
> URL: https://issues.apache.org/jira/browse/FLINK-18190
> Project: Flink
> Issue Type: Bug
> Reporter: Chesnay Schepler
> Priority: Major
>
> Let's start with a base line, where we configure the total process memory to
> 1024mb:
> {code}
> Final Master Memory configuration:
> Total Process Memory: 1024.000mb (1073741824 bytes)
> Total Flink Memory: 576.000mb (603979776 bytes)
> Flink Heap Memory: 448.000mb (469762048 bytes)
> Flink Off-heap Memory: 128.000mb (134217728 bytes)
> JVM Metaspace Memory: 256.000mb (268435456 bytes)
> JVM Overhead Memory: 192.000mb (201326592 bytes)
> {code}
> Increasing the Metaspace Memory by 1 reduces the Total Flink memory:
> {code}
> Final Master Memory configuration:
> Total Process Memory: 1024.000mb (1073741824 bytes)
> Total Flink Memory: 575.000mb (602931200 bytes)
> Flink Heap Memory: 447.000mb (468713472 bytes)
> Flink Off-heap Memory: 128.000mb (134217728 bytes)
> JVM Metaspace Memory: 257.000mb (269484032 bytes)
> JVM Overhead Memory: 192.000mb (201326592 bytes)
> {code}
> If on the other hand we configured the Total Flink Memory as well, then the
> JVM Overhead is reduced instead.
> This is somewhat in line with the documentation, but it may be good to
> explicitly document this behavior. Users that rely on the default
> configuration may stumble on this when they run into metaspace issues,
> increasing this one option without having configured anything else.
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