fix(spanner): parallelize session deletion when closing pool #3701
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Closing the session pool when closing a Spanner client should be quick and should ignore any errors that are caused by an unresponsive backend or by loss of connectivity. Go does not support fire-and-forget RPC invocations. Instead this solution uses parallel invocations of the DeleteSession RPC with short timeouts that are ignored if they occur. Fixes #3685
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🤖 I have created a release \*beep\* \*boop\* --- ## [1.15.0](https://github.com/googleapis/google-cloud-go/compare/v1.14.1...v1.15.0) (2021-02-24) ### Features * **spanner/admin/database:** add CMEK fields to backup and database ([47037ed](https://github.com/googleapis/google-cloud-go/commit/47037ed33cd36edfff4ba7c4a4ea332140d5e67b)) * **spanner/admin/database:** add CMEK fields to backup and database ([16597fa](https://github.com/googleapis/google-cloud-go/commit/16597fa1ce549053c7183e8456e23f554a5501de)) ### Bug Fixes * **spanner:** parallelize session deletion when closing pool ([#3701](https://github.com/googleapis/google-cloud-go/issues/3701)) ([75ac7d2](https://github.com/googleapis/google-cloud-go/commit/75ac7d2506e706869ae41cf186b0c873b146e926)), refs [#3685](https://github.com/googleapis/google-cloud-go/issues/3685) This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).
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Closing the session pool when closing a Spanner client should be quick and should ignore any errors that are caused by an unresponsive backend or by loss of connectivity. Go does not support fire-and-forget RPC invocations. Instead this solution uses parallel invocations of the
DeleteSessionRPC with short timeouts that are ignored if they occur.Fixes #3685