Near-real-time replication framework
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Handles copying one set of files, e.g.
Callback invoked by CopyJob once all files have (finally) finished copying
Copies one file from an incoming DataInput to a dest filename in a local Directory
Holds incRef'd file level details for one point-in-time segment infos on the primary node.
Holds metadata details about a single file that we use to confirm two files (one remote, one
local) are in fact "identical".
Replica node, that pulls index changes from the primary node by copying newly flushed or merged
index files.