TSSP Procedures

This section contains recommendations pertaining to the Issues section of the TSSP Framework article.

(back to Protocol Standardization Efforts)

Fault Tolerance

The steps that compose the five proposed standard operations are shown ranked by how many times they appear in the operations' construction. Also, each step is categorized as being able, or desired, to be implemented in parallel. Steps that support parallelism assume that the failure of one of the executing threads compromises the entire operation, triggering aggressive rollback when possible. Inability to rollback can result in several undesired states:

• Inaccessible channel capacity
• Inaccessible channel content
• Skewed channel duration
• Skewed channel capacity

Step	Occurrence	Parallel (T/F)	Failure Type	Procedure
obtain metadata	5	F	connection timeout authentication failed path not found permission denied connection broken operation canceled client destroyed size mismatch invalid schema	- - - - - - - - -
fill channel (store/copy)	3	T	connection timeout authentication failed invalid capability invalid WRITE key insufficient space connection broken operation canceled size mismatch input stream closed	- - - - - - - - -
obtain depot set	2	T	connection timeout authentication failed empty set returned connection broken operation canceled invalid schema	- - - - - -
determine next depot	2	F	malformed query invalid schema null result	- - -
reserve channel (alloc)	2	T	connection timed out authentication failed invalid resource insufficient capacity insufficient duration connection broken client destroyed operation canceled	- - - - - - - -
publish/record metadata	2	F	connection timeout authentication failed path not found permission denied not enough space connection broken operation canceled client destroyed	- - - - - - - -
order depot set	1	F	malformed query invalid schema	- -
expire channel	1	T	connection timed out authentication failed invalid capability invalid MANAGE key connection broken operation canceled	- - - - - -
consume content (load)	1	T	connection timed out authentication failed invalid capability invalid READ key bytes read mismatch connection broken operation canceled output stream closed	- - - - - - - -
channel duration	1	T	-	-
channel capacity	1	T	-	-