[fix](cloud-mow) get delete bitmap update lock should create a new Transaction when encounter TXN_TOO_OLD #44691
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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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gavinchou
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Dec 3, 2024
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| void internal_get_tablet_stats(MetaServiceCode& code, std::string& msg, Transaction* txn, | ||
| void internal_get_tablet_stats(MetaServiceCode& code, std::string& msg, | ||
| std::unique_ptr<Transaction>& txn, std::shared_ptr<TxnKv>& txn_kv, |
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This is a behavior change, semantic changed, txn atomic is not garanteed if we create a new txn.
Fix where this internal_get_tablet_stats() is called if we met TXN_TOO_OLD
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@gavinchou already change the code, take a look please
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| code = MetaServiceCode::OK; | ||
| txn = nullptr; | ||
| retry++; | ||
| err = txn_kv_->create_txn(&txn); |
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overwrite the txn cannot modify the "delete_bitmap_upldate_lock"
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What problem does this PR solve?
Related PR: #37670
Problem Summary:
When the number of tablet is big, get delete bitmap update lock may cost over 5 seconds, which will lead to transaction timeout, we should create a new transaction to get the remaining tablet stats.
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