Re: GC histogram analysis

2014-04-16 Thread Chris Lohfink
You can take a heap dump and find out who has references to it. Can find out more which column family they are from. Do you have a lot of tombstones or have data thats over written a lot or and doing a ton of reads? Maybe wide rows that your querying across or using filtering? Reads could hav

Re: GC histogram analysis

2014-04-16 Thread Ruchir Jha
No we don't. Sent from my iPhone > On Apr 16, 2014, at 9:21 AM, Mark Reddy wrote: > > Do you delete and/or set TTLs on your data? > > >> On Wed, Apr 16, 2014 at 2:14 PM, Ruchir Jha wrote: >> Hi, >> >> I am trying to investigate ParNew promotion failures happening routinely in >> productio

Re: GC histogram analysis

2014-04-16 Thread Mark Reddy
Do you delete and/or set TTLs on your data? On Wed, Apr 16, 2014 at 2:14 PM, Ruchir Jha wrote: > Hi, > > I am trying to investigate ParNew promotion failures happening routinely > in production. As part of this exercise, I enabled > -XX:PrintHistogramBeforeFullGC and saw the following output. A

GC histogram analysis

2014-04-16 Thread Ruchir Jha
Hi, I am trying to investigate ParNew promotion failures happening routinely in production. As part of this exercise, I enabled -XX:PrintHistogramBeforeFullGC and saw the following output. As you can see there are a ton of Columns, ExpiringColumns and DeletedColumns before GC ran and these numbers