Methods and systems for maintaining cache coherency between nodes in a clustered environment by performing a bitmap lookup in response to a read request from one of the nodes

A non-transitory computer-readable storage medium, comprising program instructions, which, when executed by one or more processors of a computing system, perform a method comprising:

• maintaining lock information for a plurality of data objects, wherein
• the lock information is maintained by a master node,
• the master node is one of a plurality of nodes of a cluster, and
• the lock information identifies each one of a plurality of owner nodes holding a lock on each data object of the plurality of data objects;
• receiving a query from a reader node, wherein
• the reader node is a node of the plurality of nodes other than the master node,
• each owner node of the plurality of owner nodes is a node of the plurality of nodes other than the master node or the reader node, and
• the query identifies a data object;
• determining whether the data object is among the plurality of data objects;
• and
• in response to a determination that the data object is among the plurality of data objects,
• attempting to identify an owner node holding the lock on the data object, wherein the owner node is a one of the plurality of owner nodes, and
• in response to the owner node being identified, sending a request for the data object to the owner node.

A system comprising:

• one or more processors;
• and
• a memory coupled to the one or more processors, wherein the memory stores program instructions executable by the one or more processors to perform a method comprising
• maintaining lock information for a plurality of data objects, wherein
• the lock information is maintained by a master node,
• the master node is one of a plurality of nodes of a cluster, and
• the lock information identifies each one of a plurality of owner nodes holding a lock on each data object of the plurality of data objects,
• receiving a query from a reader node, wherein
• the reader node is a node of the plurality of nodes other than the master node,
• each owner node of the plurality of owner nodes is a node of the plurality of nodes other than the master node or the reader node, and
• the query identifies a data object,
• determining whether the data object is among the plurality of data objects, and
• in response to a determination that the data object is among the plurality of data objects,
• attempting to identify an owner node holding the lock on the data object, wherein
• the owner node is a one of the plurality of owner nodes, and
• in response to the owner node being identified, sending a request for the data object to the owner node.