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Recovery From Failure

Coord Node

As the coord node user data does not exist, so you can directly after a failure to restart, do not participate in any additional recovery steps.

Catalog Node

Catalog a node failure recovery strategies and the same data nodes.

Data Node

Data node fails, restart will automatically detect the database directory .SEQUOIADB_STARTUP hidden files.

If the file exists then the last execution terminates unexpectedly (eg kill -9). For the unexpected termination of the node, the system will crash recovery into the data node status.

In crash recovery process, the data node in the group with a normal amount of synchronizing all nodes. In this case, the restored node void all the data synchronized to the new data as a reference. Assuming that the node has not been terminated unexpectedly (eg kill -15), then enter the incremental synchronization status. In this case, if the current node other data contained in the oldest log is already higher than the new node to be restored, then enter the full amount of synchronization state, otherwise only the incremental synchronization log.

If the data set of all nodes are terminated unexpectedly, you need to start a node in standalone mode for local recovery. In this mode, the data will be exported and reimported to filter out all the possible data corruption. When one of the local node is restored, it needs to be copied into the data directory for all other data nodes.

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About Us

SequoiaDB is a financial-level distributed database vendor and is the first Chinese database listed in Gartner’s Magic Quadrant OPDBMS report. SequoiaDB has recently released version 3.0.
SequoiaDB is now penetrating the vertical sector Financial Industry quickly and had more than 50 banking clients and hundreds of enterprise customers in industries including government, telecommunication, Internet and IoT.

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