Fix memory management in copyDataToS3File

[vitlibar]

Changelog category:

• Improvement

Changelog entry:

Fix memory management in copyDataToS3File.

[robot-clickhouse]

This is an automated comment for commit 19bc0b7 with description of existing statuses. It's updated for the latest CI running

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[vitlibar]

Here was a problem. The req contains a ReadBufferFromS3, and so keeping req in each task means keeping all such read buffers until the end of copying all the parts (and there can be thousands of parts). Each ReadBufferFromS3 normally takes 1MB of memory so keeping read buffers from already uploaded parts means we could waste multiple gigabytes of memory.

This PR is fixing that - now req is created and destroyed while running each task in processUploadTask() without keeping those requests or read buffers until the end of the copying process.

[jsc0218]

nice description, probably add it into the src file as comments

[vitlibar]

done

[davenger]

AFAIU previously this method was called in one thread from uploadPart() and with the fix it will be called from processUploadTask(*task) scheduled in a thread pool. Looks like it can be declared const and have a comment that derived class needs to take care about synchronization.

[vitlibar]

done

[vitlibar]

Test failures:

• Logical error: not_processed should be empty - see issue 58319
• 02901_parallel_replicas_rollup, 02968_full_sorting_join_fuzz, 02891_array_shingles are flaky