On Fri, Sep 5, 2014 at 6:12 AM, Rahul Neelakantan <ra...@rahul.be> wrote:
> The questions are for Cassandra 1.0.8 but may apply to later versions too. > Upgrade your very old version of Cassandra ASAP. I barely remember the implementation of HH in your old version. > 1) When the coordinator notices that a node it is collecting hints for is > down for more than the max hint window, it stops collecting hints for that > node > - Does it automatically purge the hints it collected so far, or does > removing them require manual intervention? > It tries to deliver the hints it has stored so far, when it can. When it delivers them, it deletes them. > - What is the recommended way to remove hints if they are not > automatically removed? Stop node and delete hints CF db files? or use > truncate CF? > Either way is fine. There's also a JMX method (maybe not in your old version) to purge hints. > 2) When the coordinator replays hints to a node that has come back within > the max hint window, does it purge those hints once they are replayed or > does cleanup of those hints require manual intervention? > The former. > 3) If a node is flapping because of network issues and gossip keeps > thinking the node is down, causing the coordinator to reset the max hint > window for that node and start collecting hints again for the node > - Does it automatically purge the hints collected in the previous windows? > No. > - Or Does it replay all hints collected in all windows that the node was > down? > Yes. =Rob
