On Mon, Feb 29, 2016 at 8:52 AM, Alain RODRIGUEZ <arodr...@gmail.com> wrote:
> I wrote that a few days ago: > http://thelastpickle.com/blog/2016/02/25/removing-a-disk-mapping-from-cassandra.html > > I believe this might help you. > Yes, looks promising. Thanks! > C*heers, > ----------------------- > > Alain Rodriguez - al...@thelastpickle.com > France > > The Last Pickle - Apache Cassandra Consulting > http <http://www.thelastpickle.com/>:// <http://www.thelastpickle.com/> > www.thelastpickle.com > Le 28 févr. 2016 15:17, "Clint Martin" < > clintlmar...@coolfiretechnologies.com> a écrit : > >> Code wise, I am not completely familiar with what accomplishes the >> behavior. But my understanding and experience is that Cass 2.1 picks the >> drive with the most free space when picking a destination for a compaction >> operation. >> (This is an overly simplistic description. Reality is always more >> nuanced. datastax had a blog post that describes this better as well as >> limitations to the algorithm in 2.1 which are addressed in the 3.x releases >> ) >> >> Clint >> On Feb 28, 2016 10:11 AM, "Michał Łowicki" <mlowi...@gmail.com> wrote: >> >>> >>> >>> On Sun, Feb 28, 2016 at 4:00 PM, Clint Martin < >>> clintlmar...@coolfiretechnologies.com> wrote: >>> >>>> Your plan for replacing your 200gb drive sounds good to me. Since you >>>> are running jbod, I wouldn't worry about manually redistributing data from >>>> your other disk to the new one. Cassandra will do that for you as it >>>> performs compaction. >>>> >>> >>> Is this done by pickWriteableDirectory >>> <https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/Directories.java#L386> >>> ? >>> >>>> While you're doing the drive change, you need to complete the swap and >>>> restart of the node before the hinted handoff window expires on the other >>>> nodes. If you do not complete in time, you'll want to perform a repair on >>>> the node. >>>> >>> >>> Yes. Thanks! >>> >>> >>>> >>>> >>>> Clint >>>> On Feb 28, 2016 9:33 AM, "Michał Łowicki" <mlowi...@gmail.com> wrote: >>>> >>>>> Hi, >>>>> >>>>> I've two disks on single box (500GB + 200GB). data_file_directories >>>>> in cassandra.yaml has two entries. I would like to replace 200GB with >>>>> 500GB >>>>> as it's running out of space and to align it with others we've in the >>>>> cluster. The plan is to stop C*, attach new disk, move data from 200GB to >>>>> new one and mount it at the same point in the hierarchy. When done start >>>>> C*. >>>>> >>>>> Additionally I would like to move some data from the old 500GB to the >>>>> new one to distribute used disk space equally. Probably all related files >>>>> for single SSTable should be moved i.e. >>>>> >>>>> foo-bar-ka-1630184-CompressionInfo.db >>>>> >>>>> foo-bar-ka-1630184-Data.db >>>>> >>>>> foo-bar-ka-1630184-Digest.sha1 >>>>> >>>>> foo-bar-ka-1630184-Filter.db >>>>> >>>>> foo-bar-ka-1630184-Index.db >>>>> >>>>> foo-bar-ka-1630184-Statistics.db >>>>> >>>>> foo-bar-ka-1630184-Summary.db >>>>> >>>>> foo-bar-ka-1630184-TOC.txt >>>>> >>>>> Is this something which should work or you see some obstacles? (C* >>>>> 2.1.13). >>>>> -- >>>>> BR, >>>>> Michał Łowicki >>>>> >>>> >>> >>> >>> -- >>> BR, >>> Michał Łowicki >>> >> -- BR, Michał Łowicki
