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

["Leonhard Gruenschloss (Jira)" <ji...@apache.org>]

Leonhard Gruenschloss created ARROW-17033:
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             Summary: [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


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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