Page Comparison

...

Follow the code and read along..

TODO: Chritian's diagram here (fig 3 from his report). Edit to make corrections.

...

• check client's tabletMap (which is a cache of coordinator's tablet map)
• if that tablet is recovering or if the obj was not found in any tablet:
  • refresh that cache by:
  • refresher(tabletMap) - hardwired to CoordinatorClient::getTabletMap (in the constructor)
• finally return the SessionRef

ObjectFinder.cc -> lookup()
check client's tabletMap (which is a cache of coordinator's tablet map)
if that tablet is recovering or if the obj was not found in any tablet:
refresher(tabletMap) - hardwired to CoordinatorClient::getTabletMap - get a new copy of tabletMap
finally return the SessionRef

Some general information:

On the other hand:

BUFFER contains:

• Transport Layer Header
• Response Header, respHdr (see Rpc.h)
  • For ReadRpc, the Response struct has:
    • version
    • length
    • pad
• Data (obj->data from above diagram)