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From Apache Wiki <>
Subject [Cassandra Wiki] Update of "NodeTool" by DavidAllsopp
Date Thu, 21 Jul 2011 14:59:52 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

The "NodeTool" page has been changed by DavidAllsopp:

  == Flush ==
  Flushes memtables (in memory) to SSTables (on disk), which also enables CommitLog segments
to be deleted. 
+ == Removetoken==
+ Removes a dead node from the ring - this command is issued to any other live node (since
clearly the dead node cannot respond!). 
  == Scrub ==
  Cassandra v0.7.1 and v0.7.2 shipped with a bug that caused incorrect row-level bloom filters
to be generated when compacting sstables generated with earlier versions.  This would manifest
in IOExceptions during column name-based queries.  v0.7.3 provides "nodetool scrub" to rebuild
sstables with correct bloom filters, with no data lost. (If your cluster was never on 0.7.0
or earlier, you don't have to worry about this.)  Note that nodetool scrub will snapshot your
data files before rebuilding, just in case.

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