-----Original Message-----
From: stack [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 26, 2008 12:13 PM
To: [email protected]
Subject: Re: Interesting heap dump of an OOME running
Performance Evaluation on trunk
Each region has a memcache. Memcache is 64MB. Each
HStoreKey has two Texts -- one for row, other for column.
30*(64MB/1k records) each of which has a HSK makes for almost
4M keys. With half-full memcaches, we can easily have 1.3M
keys if my math is right.
Regards the other objects, 30 regions * 2-10 store files --
up to 10 store files if region is being overrun with updates
-- with some logging thrown in is only about 100odd so maybe
something going on here. But do these items have any weight?
Are they large? (If buffers were 4k..
then we're talking about 1M for 227 instances?)
St.Ack
Bryan Duxbury wrote:
Yikes. 1.3M Texts for 30 regions? that's crazy. Seems like
we must be
doing something wrong there.
On Mar 26, 2008, at 11:37 AM, Jim Kellerman wrote:
Ok, so no big surprise that there are a lot of Text and HStoreKeys
lying around, but look at the other stuff hanging out that really
should not be, esp when you consider the number of HRegions
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0 instances of class [Lorg.apache.hadoop.dfs.DFSFileInfo;
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0 instances of class [Lorg.apache.hadoop.fs.Path; 0 instances of
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0 instances of class
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0 instances of class [Lorg.apache.hadoop.io.Writable; 0
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[Lorg.mortbay.http.HttpContext; 0 instances of class
[Lorg.mortbay.http.HttpListener; 0 instances of class
[Lorg.mortbay.jetty.servlet.Holder;
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[Lorg.mortbay.util.LifeCycle; 0 instances of class
[Lorg.mortbay.xml.XmlParser$Attribute;
---
Jim Kellerman, Senior Engineer; Powerset
No virus found in this outgoing message.
Checked by AVG.
Version: 7.5.519 / Virus Database: 269.22.0/1344 - Release Date:
3/26/2008 8:52 AM
No virus found in this incoming message.
Checked by AVG.
Version: 7.5.519 / Virus Database: 269.22.0/1344 - Release
Date: 3/26/2008 8:52 AM
