Dealt with that recently, and the only solution that made it work was to increase heap sizes.
Regards, Carlos Juzarte Rolo Cassandra Consultant Pythian - Love your data rolo@pythian | Twitter: @cjrolo | Linkedin: *linkedin.com/in/carlosjuzarterolo <http://linkedin.com/in/carlosjuzarterolo>* Mobile: +351 91 891 81 00 | Tel: +1 613 565 8696 x1649 www.pythian.com On Thu, Dec 10, 2015 at 10:14 PM, Mikhail Strebkov <streb...@gmail.com> wrote: > Jeff, CMS GC didn't help. Thinking about it, I don't see how can it help > if there are 8GB of strongly reachable objects from the GC roots. > > Walsh, thanks for your suggestion, I checked the log and there are some > compactions_in_progress but total size of those is ~300 MiB as far as I > understand. > > Here is the log of the last unsuccessful start: > https://gist.github.com/kluyg/7b9955d34def947f5e0a > > > On Thu, Dec 10, 2015 at 2:09 AM, Walsh, Stephen <stephen.wa...@aspect.com> > wrote: > >> 8GB is the max recommended for heap size and that’s if you have 32GB or >> more available. >> >> >> >> We use 6GB on our 16GB machines and its very stable >> >> >> >> The out of memory could be coming from cassandra reloading >> compactions_in_progress into memory, you can check this from the log files >> if needs be. >> >> You can safely delete this folder inside the data directory. >> >> >> >> This can happen if you didn’t stop cassandra with a drain command and >> wait for the compactions to finish. >> >> Last time we hit it – was due to testing HA when we forced killed an >> entire cluster. >> >> >> >> Steve >> >> >> >> >> >> >> >> *From:* Jeff Jirsa [mailto:jeff.ji...@crowdstrike.com] >> *Sent:* 10 December 2015 02:49 >> *To:* user@cassandra.apache.org >> *Subject:* Re: Unable to start one Cassandra node: OutOfMemoryError >> >> >> >> 8G is probably too small for a G1 heap. Raise your heap or try CMS >> instead. >> >> >> >> 71% of your heap is collections – may be a weird data model quirk, but >> try CMS first and see if that behaves better. >> >> >> >> >> >> >> >> *From: *Mikhail Strebkov >> *Reply-To: *"user@cassandra.apache.org" >> *Date: *Wednesday, December 9, 2015 at 5:26 PM >> *To: *"user@cassandra.apache.org" >> *Subject: *Unable to start one Cassandra node: OutOfMemoryError >> >> >> >> Hi everyone, >> >> >> >> While upgrading our 5 machines cluster from DSE version 4.7.1 (Cassandra >> 2.1.8) to DSE version: 4.8.2 (Cassandra 2.1.11) one of the nodes can't >> start with OutOfMemoryError. >> >> We're using HotSpot 64-Bit Server VM/1.8.0_45 and G1 garbage collector >> with 8 GiB heap. >> >> Average node size is 300 GiB. >> >> >> >> I looked at the heap dump with YourKit profiler (www.yourkit.com) and it >> was quite hard since it's so big, but can't get much out of it: >> http://i.imgur.com/fIRImma.png >> >> >> >> As far as I understand the report, there are 1,332,812 instances of >> org.apache.cassandra.db.Row which retain 8 GiB. I don't understand why all >> of them are still strongly reachable? >> >> >> >> Please help me to debug this. I don't know even where to start. >> >> I feel very uncomfortable with 1 node running 4.8.2, 1 node down and 3 >> nodes running 4.7.1 at the same time. >> >> >> >> Thanks, >> >> Mikhail >> >> >> >> >> This email (including any attachments) is proprietary to Aspect Software, >> Inc. and may contain information that is confidential. If you have received >> this message in error, please do not read, copy or forward this message. >> Please notify the sender immediately, delete it from your system and >> destroy any copies. You may not further disclose or distribute this email >> or its attachments. >> > > -- --
