160% cpu load when connecting to dp4 through java client.

Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Duplicate
Affects Version/s: 1.1dp
Fix Version/s: None
Component/s: library
Security Level: Public
Labels:
None
Environment:

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client and server are running on the same machine

On mac os 10.7.3,
java version "1.6.0_29"
Java(TM) SE Runtime Environment (build 1.6.0_29-b11-402-11D50b)
Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02-402, mixed mode)
DP java client: http://www.couchbase.com/develop/java/next

<repository>
<id>couchbase</id>
<name>couchbase repo</name>
<url>http://files.couchbase.com/maven2</url>
<layout>default</layout>
</repository>

<dependency>
<groupId>spy</groupId>
<artifactId>spymemcached</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>couchbase</groupId>
<artifactId>couchbase-client</artifactId>
<version>1.1-dp</version>
</dependency>
<dependency>
<groupId>org.jboss.netty</groupId>
<artifactId>netty</artifactId>
<version>3.2.0.Final</version>
</dependency>
<dependency>
<groupId>org.codehaus.jettison</groupId>
<artifactId>jettison</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.5</version>
</dependency>

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client and server are running on the same machine On mac os 10.7.3, java version "1.6.0_29" Java(TM) SE Runtime Environment (build 1.6.0_29-b11-402-11D50b) Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02-402, mixed mode) DP java client: http://www.couchbase.com/develop/java/next <repository> <id>couchbase</id> <name>couchbase repo</name> <url> http://files.couchbase.com/maven2</url > <layout>default</layout> </repository> <dependency> <groupId>spy</groupId> <artifactId>spymemcached</artifactId> <version>2.8.1</version> </dependency> <dependency> <groupId>couchbase</groupId> <artifactId>couchbase-client</artifactId> <version>1.1-dp</version> </dependency> <dependency> <groupId>org.jboss.netty</groupId> <artifactId>netty</artifactId> <version>3.2.0.Final</version> </dependency> <dependency> <groupId>org.codehaus.jettison</groupId> <artifactId>jettison</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.5</version> </dependency>

Description

presales customer is connecting 1.1dp java client to dp4 and seeing 160% cpu load.

With the older client jars against dp3 they were seeing 100-120% cpu load.

This cpu load is right after application start with no load at all, after connecting to couchbase.

from customer:
"This issue specifically in DP3: http://www.couchbase.com/forums/thread/high-cpu-load-even-when-java-database-client-idle We've been seeing this both on mac and ubuntu."

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Attachments

ViewConnection.java

04/May/12 9:49 AM

10 kB

Alan Wood
ViewNode-HighCPU.patch

07/Apr/12 12:00 PM

2 kB

Velasticus

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Alex Ma added a comment - 26/Mar/12 4:32 PM

Hi Rags,

Just wondering if there was any update on this ticket?

thanks

-Alex

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Alex Ma added a comment - 26/Mar/12 4:32 PM Hi Rags, Just wondering if there was any update on this ticket? thanks -Alex

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Velasticus added a comment - 07/Apr/12 12:00 PM

I can confirm this happens in my java app as well. The problem is in the ViewConnection/ViewNode thread that sits in a tight loop when there is nothing to process. This patch adds a timeout to the poll method which reduces CPU down to almost zero.

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Velasticus added a comment - 07/Apr/12 12:00 PM I can confirm this happens in my java app as well. The problem is in the ViewConnection/ViewNode thread that sits in a tight loop when there is nothing to process. This patch adds a timeout to the poll method which reduces CPU down to almost zero.

Velasticus made changes - 07/Apr/12 12:00 PM

Field	Original Value	New Value
Attachment		ViewNode-HighCPU.patch [ 12676 ]

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Alan Wood added a comment - 04/May/12 9:49 AM - edited

Added a new version of "View Connection" to combat the 100% cpu issue.

This version of "View Connection" will block when nothing is happening. It also doesn't block shutdown. Seems to work both when the view connection is "idle" and when it is returning view work. The previous patch had issues with shutdown and possibly with nodes not having work blocking other nodes.

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Alan Wood added a comment - 04/May/12 9:49 AM - edited Added a new version of "View Connection" to combat the 100% cpu issue. This version of "View Connection" will block when nothing is happening. It also doesn't block shutdown. Seems to work both when the view connection is "idle" and when it is returning view work. The previous patch had issues with shutdown and possibly with nodes not having work blocking other nodes.

Alan Wood made changes - 04/May/12 9:49 AM

Attachment

ViewConnection.java [ 13014 ]

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Mike Wiederhold added a comment - 03/Jun/12 12:48 AM

Duplicate of ~~JCBC-20~~. I have a change in review that fixes this issue. I will get it through review next week.

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Mike Wiederhold added a comment - 03/Jun/12 12:48 AM Duplicate of JCBC-20 . I have a change in review that fixes this issue. I will get it through review next week.

Mike Wiederhold made changes - 03/Jun/12 12:48 AM

Status	Open [ 1 ]	Closed [ 6 ]
Resolution		Duplicate [ 3 ]

People

Assignee:

Raghavan Srinivas

Reporter:

Alex Ma

Vote (1)

Watch (1)

Dates

Created:

23/Mar/12 2:33 AM

Updated:

03/Jun/12 12:48 AM

Resolved:

03/Jun/12 12:48 AM

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