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…quests deadlock and deleting xrepl tablets Summary: Original commit: aead171 / D35458 Updating retained_by_* maps in DeleteTabletListAndSendRequests before committing the tablet locks. This ensures that if there are multiple calls to DeleteTabletListAndSendRequests (eg due to a few CleanupSplitTablets calls) that xrepl tablets are only hidden on the first call and ignored for later calls. Also fixing the deadlock in DeleteTabletListAndSendRequests that can arise with mutex_ and tablet locks. Jira: DB-11526, DB-11517 Test Plan: ybd --cxx-test xcluster-tablet-split-itest --gtest_filter "CdcTabletSplitThreeMastersITest.TestRaceAfterHidingAndRetainingTablet" Reviewers: xCluster, hsunder, skumar, vkushwaha Reviewed By: hsunder Tags: #jenkins-ready Differential Revision: https://phorge.dev.yugabyte.com/D35728
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