Support multi-disks for latest data #1156,#1199,#1216 #1159
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cherry-pick of #1156, #1199, #1216
What problem does this PR solve?
Issue Number: close #1128
Problem Summary: Currently, we can only use one path to store a PageStorage. It causes much more IO pressure(from Delta and Region snapshots) for the first disk than other disks when TiFlash is deployed in multi-paths mode. And support multi-paths for PageStorage can distribute the IO pressures between all disks.
What is changed and how it works?
Design doc：https://docs.google.com/document/d/1281wqqWNVj6LZMiWfcBPPQLOQN7w3koODPVLYWM6E68/edit#
PathPoolPathPool: Only store the main_data_paths and latest_data_paths. GenerateStoragePathPoolfor each storageStoragePathPool: A class to manage paths for the specified storage*-Delegator: Some delegator generated byStoragePathPool. They are used for managing the path for storing stable/delta/raft dataPageStorageandStorageDeltaMergeto adapt to newPathPoolPathCapacityMetricsfor more detailsRelated changes
pingcap/docs/pingcap/docs-cn:Check List
Tests
Side effects
Release note