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From ruslan usifov <ruslan.usi...@gmail.com>
Subject Re: ParNew (promotion failed)
Date Sat, 26 Mar 2011 17:18:08 GMT
2011/3/23 ruslan usifov <ruslan.usifov@gmail.com>

> Hello
>
> Sometimes i seen in gc log follow message:
>
> 2011-03-23T14:40:56.049+0300: 14897.104: [GC 14897.104: [ParNew (promotion
> failed)
> Desired survivor size 41943040 bytes, new threshold 2 (max 2)
> - age   1:    5573024 bytes,    5573024 total
> - age   2:    5064608 bytes,   10637632 total
> : 672577K->670749K(737280K), 0.1837950 secs]14897.288: [CMS:
> 1602487K->779310K(2326528K), 4.7525580 secs] 2270940K->779310K(3063808K), [
> CMS Perm : 20073K->19913K(33420K)], 4.9365810 secs] [Times: user=5.06
> sys=0.00, real=4.93 secs]
> Total time for which application threads were stopped: 4.9378750 seconds
>

After investigations i detect that this happens when Memtableflash and
compact happens. So at this moment young part of heap is overflown and Full
GC happens.

So to resolve this i must tune young generation (HEAP_NEWSIZE) -Xmn, and
tune in_memory_compaction_limit_in_mb config parameter?

Also if memtables flushes due  "memtable_flush_after" if i separate in time
memtable flushes can this helps?

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