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https://issues.apache.org/jira/browse/DRILL-4737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Rogers updated DRILL-4737:
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Issue Type: Improvement (was: Bug)
> Adjust drill-env.sh instructions to reflect config/site directories
> -------------------------------------------------------------------
>
> Key: DRILL-4737
> URL: https://issues.apache.org/jira/browse/DRILL-4737
> Project: Apache Drill
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 1.8.0
> Reporter: Paul Rogers
> Priority: Minor
>
> See https://drill.apache.org/docs/starting-drill-in-distributed-mode/
> Requires a number of changes to reflect Drill's support of a configuration
> directory as specified by:
> drillbit.sh --config /path/to/config/dir cmd
> "The default memory for a Drillbit is 8G, but Drill prefers 16G" The default
> *direct* memory for Drill is 8G. The default total memory for Drill is 12G.
> (Included 4G heap.)
> "Drillbit startup script located in <drill_installation_directory>/conf/drill-
> env.sh." The location is $SITE_DIR/drill-env.sh. $SITE_DIR is either:
> 1. $DRILL_HOME/conf by default (as stated in the docs), or
> 2. Specified by the --config <site_dir> option to drillbit.sh
> "edit the XX:MaxDirectMemorySize parameter". Please show how to do this. The
> correct form (to work with YARN) is:
> export DRILL_MAX_DIRECT_MEMORY=${DRILL_MAX_DIRECT_MEMORY:-"8G"}
> Where the new value replaces the "8G". (This is different than the pre-1.8
> form.)
> "If this parameter is not set, the limit depends on the amount of available
> system memory." This has never turned out to be true as the script always
> provides a default value.
> Another point: Drill assumes all nodes have the same amount of memory.
> Relying on system memory will not, in general, work as some Drillbits (with
> less system memory) will die with OOM errors. I suspect this is why a default
> setting is always provided.
> "After you edit <drill_installation_directory>/conf/drill-env.sh" change to
> "After you edit drill-env.sh" to avoid repeating the path.
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