how Cassandra writes changed data into commitlog?
Answer / Alok Shukla
Cassandra writes changed data into a commit log by appending it to the end of the log file. The commit log records all mutations (write operations) that are sent from clients, but have not yet been written to the SSTables. Each write operation includes a unique timestamp and a sequence number. When a new SSTable is created or an existing one is flushed, the contents of the commit log are copied into the new SSTable.
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