[jira] [Updated] (ARROW-17033) [C++] Add GCS connection pool size option

["Antoine Pitrou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou updated ARROW-17033:
-----------------------------------
    Labels: GCP good-first-issue performance  (was: GCP performance)

> [C++] Add GCS connection pool size option
> -----------------------------------------
>
>                 Key: ARROW-17033
>                 URL: https://issues.apache.org/jira/browse/ARROW-17033
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 8.0.0
>            Reporter: Leonhard Gruenschloss
>            Priority: Minor
>              Labels: GCP, good-first-issue, performance
>
> Multi-threaded read performance in Arrow's GCS file system implementation currently is relatively low. Given the high latency of cloud blob systems like GCS, a common strategy is to use many concurrent readers (if the system has enough memory to support that), e.g. using 100 threads.
> The GCS client library offers a [{{ConnectionPoolSize}} option|https://googleapis.dev/cpp/google-cloud-storage/latest/structgoogle_1_1cloud_1_1storage_1_1v1_1_1ConnectionPoolSizeOption.html]. If this option is set to a value that's too low, concurrency is throttled. At the moment, this is not exposed in [{{GcsOptions}}|https://github.com/apache/arrow/blob/73cdd6a59b52781cc43e097ccd63ac36f705ee2e/cpp/src/arrow/filesystem/gcsfs.h#L59], consequently limiting multi-threaded throughput.
> Instead of exposing this option, an alternative implementation strategy could be to use the same value as set by {{arrow::io::SetIOThreadPoolCapacity}}.



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