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https://issues.apache.org/jira/browse/SPARK-2468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14202056#comment-14202056
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Lianhui Wang edited comment on SPARK-2468 at 11/7/14 2:01 PM:
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[~adav] yes,with https://github.com/apache/spark/pull/3155/ in my test
beyond physical memory limits does not happened.but i discover that Netty's
performance is not good than NioBlockTransferService. so I need to find why
Netty's performance is bad than NioBlockTransferService in my test.Can you give
me some suggestions? thanks.and how about your test? [~zzcclp]
was (Author: lianhuiwang):
[~adav] yes,with https://github.com/apache/spark/pull/3155/ in my test it
does not happened.but i discover that Netty's performance is not good than
NioBlockTransferService. so I need to find why Netty's performance is bad than
NioBlockTransferService in my test.Can you give me some suggestions? thanks.and
how about your test? [~zzcclp]
> Netty-based block server / client module
> ----------------------------------------
>
> Key: SPARK-2468
> URL: https://issues.apache.org/jira/browse/SPARK-2468
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle, Spark Core
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Priority: Critical
> Fix For: 1.2.0
>
>
> Right now shuffle send goes through the block manager. This is inefficient
> because it requires loading a block from disk into a kernel buffer, then into
> a user space buffer, and then back to a kernel send buffer before it reaches
> the NIC. It does multiple copies of the data and context switching between
> kernel/user. It also creates unnecessary buffer in the JVM that increases GC
> Instead, we should use FileChannel.transferTo, which handles this in the
> kernel space with zero-copy. See
> http://www.ibm.com/developerworks/library/j-zerocopy/
> One potential solution is to use Netty. Spark already has a Netty based
> network module implemented (org.apache.spark.network.netty). However, it
> lacks some functionality and is turned off by default.
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