Patent ID: 8805901
Filing Date: 2014-08-12
Classification: G06F

Abstract:
1. A method implemented by data processing apparatus, the method including: identifying, by a first pointer manager of a plurality of pointer managers, a first version of a directory, the first version of the directory including i) a first pointer and ii) an association of a name with the first pointer, wherein the first pointer is a reference to a first version of an immutable data object in an append-only file system; receiving, by the first pointer manager, a modified version of the data object from a first computing device in communication with the first pointer manager; determining, by each pointer manager of the plurality of pointer managers, whether the data object stored by the file system was updated by any computing device other than the first computing device before the first pointer manager received the modified version of the data object; if a majority of the plurality of pointer managers determine that the data object stored by the file system was not updated by any computing device other than the first computing device before the first pointer manager received the modified version of the data object: if a majority of the plurality of pointer managers determine that the data object stored by the file system was updated by any computing device other than the first computing device before the first pointer manager received the modified version of the data object: