Repair subsystem for persistent metafile repair to improve resiliency

A computing device comprising:

• a memory comprising machine executable code;
• and
• a processor coupled to the memory, the processor configured to execute the machine executable code to cause the processor to:
• create an object according to a unified object format, wherein data to be tiered out from a performance tier to a capacity tier of an object store is stored into slots of the object;
• attach slot header metadata to the object that is stored into the capacity tier, wherein the slot header metadata comprises two sections of metadata including a first metadata portion comprising a compression group number of a slot within which a block of the data is stored and a compression group logical index in the compression group number at which the slot is located, and a second metadata portion comprising offset and length location information for the data residing in the object, wherein the slot header metadata is cached within a persistent metafile stored within the performance tier;
• compare a sequence number read from the object in the object store with a sequence number within an entry in the persistent metafile stored within the performance tier separate from the object store, wherein the sequence number is read from the slot header metadata of the object by a read operation targeting a block of data within the object stored within the object store;
• and
• in response to the sequence numbers not matching, trigger a repair process to repair the persistent metafile using information extracted from the slot header metadata of the object, wherein the repair process is triggered and performed as part of executing the read operation.

A non-transitory machine readable medium comprising instructions for performing a method, which when executed by a machine, causes the machine to:

• create an object according to a unified object format, wherein data to be tiered out from a performance tier to a capacity tier of an object store is stored into slots of the object;
• attach slot header metadata to the object that is stored into the capacity tier, wherein the slot header metadata comprises two sections of metadata including a first metadata portion comprising a compression group number of a slot within which a block of the data is stored and a compression group logical index in the compression group number at which the slot is located, and a second metadata portion comprising offset and length location information for the data residing in the object, wherein the slot header metadata is cached within a persistent metafile stored within the performance tier;
• compare a sequence number read from the object in the object store with a sequence number within an entry in the persistent metafile stored within the performance tier separate from the object store, wherein the sequence number is read from the slot header metadata of the object by a read operation targeting a block of data within the object stored within the object store;
• and
• in response to the sequence numbers not matching, trigger a repair process to repair the persistent metafile using information extracted from the slot header metadata of the object, wherein the repair process is triggered and performed as part of executing the read operation.