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[fix](load) Fix the issue of high-concurrency single-replica load get…
…ting stuck (#42297) In high-concurrency single-replica load, the tablet_writer_add_block RPC may occupy the _heavy_work_pool completely, causing the response_slave_tablet_pull_rowset RPC to have no available threads for processing. As a result, tablet_writer_add_block waits indefinitely for a response from the slave tablet, leading to the import getting stuck until it times out. response_slave_tablet_pull_rowset is relatively lightweight, so it can be handled by the _light_work_pool.
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