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* Introduce primary context The target of a primary relocation is not aware of the state of the replication group. In particular, it is not tracking in-sync and initializing shards and their checkpoints. This means that after the target shard is started, its knowledge of the replication group could differ from that of the relocation source. In particular, this differing view can lead to it computing a global checkpoint that moves backwards after it becomes aware of the state of the entire replication group. This commit addresses this issue by transferring a primary context during relocation handoff. * Fix test * Add assertion messages * Javadocs * Barrier between marking a shard in sync and relocating * Fix misplaced call * Paranoia * Better latch countdown * Catch any exception * Fix comment * Fix wait for cluster state relocation test * Update knowledge via upate local checkpoint API * toString * Visibility * Refactor permit * Push down * Imports * Docs * Fix compilation * Remove assertion * Fix compilation * Remove context wrapper * Move PrimaryContext to new package * Piping for cluster state version This commit adds piping for the cluster state version to the global checkpoint tracker. We do not use it yet. * Remove unused import * Implement versioning in tracker * Fix test * Unneeded public * Imports * Promote on our own * Add tests * Import * Newline * Update comment * Serialization * Assertion message * Update stale comment * Remove newline * Less verbose * Remove redundant assertion * Tracking -> in-sync * Assertions * Just say no Friends do not let friends block the cluster state update thread on network operations. * Extra newline * Add allocation ID to assertion * Rename method * Another rename * Introduce sealing * Sealing tests * One more assertion * Fix imports * Safer sealing * Remove check * Remove another sealed check