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From Artur Siekielski <>
Subject Re: In-place updates in a MemTable?
Date Fri, 03 Feb 2017 20:57:19 GMT
After studying org.apache.cassandra.db.Memtable.put method it looks like 
the update is made in-place. The MemTable is just a mapping from a row 
key to a single btree of column values, and an update operation just 
updates the btree stored under the existing key.

On 02/03/2017 11:21 AM, Artur Siekielski wrote:
> Hi,
> if I issue an update to a row (non-PK keys), and the old row is still
> stored in a MemTable, is the old row updated in-place in the MemTable,
> or a new entry in the MemTable in created and the old row will be
> removed only by the SSTable compaction process?
> (Cassandra 2.1)

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