http://www.datastax.com/support-forums/topic/memtable-live-ratio Software, Support, and Training for Apache Cassandra en-US Fri, 24 May 2013 14:10:32 +0000 http://bbpress.org/?v=1.0.3 q http://www.datastax.com/support-forums/search.php http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-763 Wed, 23 Nov 2011 20:49:21 +0000 zznate 763@http://www.datastax.com/support-forums/ <p>Oh, no, this forum is for community support. For commercial support, see <a href="https://support.datastax.com/home" rel="nofollow">https://support.datastax.com/home</a> if you have an existing account - please ping me directly if you have a contract and you need additional information regarding accessing commercial support resources. </p> http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-762 Wed, 23 Nov 2011 20:47:53 +0000 zznate 762@http://www.datastax.com/support-forums/ <p>In general, your object graph should not be smaller than the amount of raw bytes. But since this is a brand new cluster, there just may be an edge case in the calculation of the ratio when very little data has been entered. I think this is safe to ignore. </p> http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-760 Wed, 23 Nov 2011 19:50:18 +0000 mohitanchlia 760@http://www.datastax.com/support-forums/ <p>Is this the right place to get C* paid support? Just want to make sure that I am in the right support forum and getting what I need. </p> http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-738 Wed, 23 Nov 2011 01:42:40 +0000 Anonymous 738@http://www.datastax.com/support-forums/ <p>A great material on a short dress, will surely keep them cool on a summer's evening. </p> http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-729 Mon, 21 Nov 2011 23:58:47 +0000 mohitanchlia 729@http://www.datastax.com/support-forums/ <p>It's C* 1.1. This is a new cluster that I recently built for Production. Yes cluster was under just a test load of few inserts when it showed this warning. </p> <p>Can you please explain more on this "unusual case"? What's supposed to happen and what might have happened?</p> <p>Thanks </p> http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-728 Mon, 21 Nov 2011 22:58:08 +0000 zznate 728@http://www.datastax.com/support-forums/ <p>To clarify on the above - this is the serialized size of the data in the memtable (in terms of raw bytes) vs. the size of the object graph as the jvm sees it (calculated by JAMM library). </p> <p>For details on the object graph calculation, see:<br /> <a href="https://github.com/jbellis/jamm" rel="nofollow">https://github.com/jbellis/jamm</a> </p> http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-727 Mon, 21 Nov 2011 19:51:56 +0000 zznate 727@http://www.datastax.com/support-forums/ <p>You are correct - hence that logging message being printed at a 'WARN' level as it is an unusual case. </p> <p>What was the general shape of the data? And did this just flush after being idle for a while or were other things going on?</p> <p>Was this just a single machine cluster running locally?</p> <p>Also, what specific version of Cassandra? </p> http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-726 Mon, 21 Nov 2011 19:44:11 +0000 mohitanchlia 726@http://www.datastax.com/support-forums/ <p>What do you mean searlized size is less than the in-memory size? I though memtable are in memory and goes to ssTable when flushed? Can you please elaborate more?</p> <p>It's a new cluster with hardly 100 keys. CF was created with all default. </p> http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-725 Mon, 21 Nov 2011 18:12:06 +0000 zznate 725@http://www.datastax.com/support-forums/ <p>This means that the serialized size of the memtable is less than the in-memory size.</p> <p>This is sort of an exceptional case - can you tell me more about the column family, the data shape, and the work load? </p> http://www.datastax.com/support-forums/topic/memtable-live-ratio#post-724 Mon, 21 Nov 2011 17:29:54 +0000 mohitanchlia 724@http://www.datastax.com/support-forums/ <p>I am getting following alerts:</p> <p>db.Memtable - setting live ratio to minimum of 10 instead of 0.8951866882910643 </p> <p>What does it really mean? Can I get detailed description? </p>