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Posted to issues-all@impala.apache.org by "shajini thayasingh (Jira)" <ji...@apache.org> on 2020/06/03 19:19:00 UTC
[jira] [Commented] (IMPALA-9817) Document flags of Fetch-on-demand
metadata coordinators
[ https://issues.apache.org/jira/browse/IMPALA-9817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17125248#comment-17125248 ]
shajini thayasingh commented on IMPALA-9817:
--------------------------------------------
[~stigahuang] do you want me to elaborate these flags under this topic "impala_metadata" and in the location where I am pointing to with an arrow?
!image-2020-06-03-12-17-06-108.png|width=550,height=864!
> Document flags of Fetch-on-demand metadata coordinators
> -------------------------------------------------------
>
> Key: IMPALA-9817
> URL: https://issues.apache.org/jira/browse/IMPALA-9817
> Project: IMPALA
> Issue Type: Documentation
> Components: Docs
> Reporter: Quanlong Huang
> Assignee: shajini thayasingh
> Priority: Critical
> Attachments: image-2020-06-03-12-17-06-108.png
>
>
> We need to document about these flags:
> {code:java}
> DEFINE_bool_hidden(use_local_catalog, false,
> "Use experimental implementation of a local catalog. If this is set, "
> "the catalog service is not used and does not need to be started.");
> DEFINE_int32_hidden(local_catalog_cache_mb, -1,
> "If --use_local_catalog is enabled, configures the size of the catalog "
> "cache within each impalad. If this is set to -1, the cache is auto-"
> "configured to 60% of the configured Java heap size. Note that the Java "
> "heap size is distinct from and typically smaller than the overall "
> "Impala memory limit.");
> DEFINE_int32_hidden(local_catalog_cache_expiration_s, 60 * 60,
> "If --use_local_catalog is enabled, configures the expiration time "
> "of the catalog cache within each impalad. Even if the configured "
> "cache capacity has not been reached, items are removed from the cache "
> "if they have not been accessed in this amount of time.");
> DEFINE_int32_hidden(local_catalog_max_fetch_retries, 40,
> "If --use_local_catalog is enabled, configures the maximum number of times "
> "the frontend retries when fetching a metadata object from the impalad "
> "coordinator's local catalog cache."); {code}
> [https://github.com/apache/impala/blob/052129c16a29891a72427b351bcc4e087d772fbe/be/src/runtime/exec-env.cc#L103-L120]
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