Alistair Coles d456d9e934 Don't ssync data when only a durable is missing ...

If an EC diskfile is missing its .durable file (for example
due to a partial PUT failure) then the ssync missing check
will fail to open the file and will consider it
missing. This can result in possible reconstruction of the
fragment archive (for a sync job) and definite transmission
of the fragment archive (for sync and revert jobs), which is
wasteful.

This patch makes the ssync receiver inspect the diskfile
state after attempting to open it, and if fragments exist at
the timestamp of the sender's diskfile, but a .durable file
is missing, then the receiver will commit the diskfile at
the sender's timestamp. As a result, there is no longer any
need to send a fragment archive.

Change-Id: I4766864fcc0a3553976e8fd85bbb2fc782f04abd

2016-03-04 15:39:52 +00:00

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