Telefonaktiebolaget Lm Ericsson (publ)

Mate Imre Nagy

Dániel Géhberger

Péter Mátray

Balázs Pinczel

Gábor Németh

Dietmar Fiedler

András CSÁSZÁR

Dániel GÉHBERGER

According to an aspect there is provided a computer-implemented method of operating a leader server in a leader server-follower server log replication configuration. The method comprises (i) storing () a current master state of a system and maintaining a master log relating to the current master state, wherein the master log comprises a plurality of log entries each having a respective log index, wherein each log entry indicates a respective change to the master state of the system; (ii) performing () a log compaction procedure to remove from the master log any log entry for which the respective change to the master state of the system has been overridden by a change to the master state in a subsequent log entry; (iii) storing () a compaction index that is the highest log index of the log entries removed in the log compaction procedure; (iv) storing () an override index that is the highest log index of the log entries for which the respective change to the master state overrode a change to the master state by an earlier log entry; and (v) sending () the compaction index and the override index to one or more follower servers that are to store a replica of the master log relating to the current master state.

Checking state consistency in a log replication configuration

Methods and apparatus for fast session restoration of user sessions in a network node are suitable for latency sensitive applications. The fast session restoration techniques take advantage of the layered architecture of a network node and stores layer-specific descriptors that describe the states of corresponding service layers of a network node for an active session. When a failure of the network nodes occurs, the descriptors are used to achieve a seamless and fast session restoration.

Fast session restoration for latency sensitive middleboxes

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Budapest, Hungary

Mate Imre Nagy