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From Tobias Jungen <>
Subject (Binary)Memtable flushing
Date Tue, 11 May 2010 20:44:56 GMT
Yet another BMT question, thought this may apply for regular memtables as

After doing a batch insert, I accidentally submitted the flush command
twice. To my surprise, the target node's log indicates that it wrote a new
*-Data.db file, and the disk usage went up accordingly. I tested and issued
the flush command a few more times, and after a few more data files I
eventually triggered a compaction, bringing the disk usage back down. The
data appears to continue to stick around in memory, however, as further
flush commands continue to result in new data files.

Shouldn't flushing a memtable remove it from memory, or is expected behavior
that it sticks around until the node needs to reclaim the memory? Should I
worry about getting out-of-memory errors if I'm doing lots of inserts in
this manner?

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