[jira] [Resolved] (IMPALA-9817) Document flags of Fetch-on-demand metadata coordinators

["Quanlong Huang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-9817?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Quanlong Huang resolved IMPALA-9817.
------------------------------------
    Fix Version/s: Impala 4.0
       Resolution: Fixed

> 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
>             Fix For: Impala 4.0
>
>         Attachments: image-2020-06-03-12-17-06-108.png, image-2020-06-03-16-06-24-451.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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