[
https://issues.apache.org/jira/browse/HBASE-16583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15475377#comment-15475377
]
binlijin commented on HBASE-16583:
----------------------------------
Yes，they have the same concerns on SEDA, and do not have too much progress on
the new model "TPC( thread per core)".
> Staged Event-Driven Architecture
> --------------------------------
>
> Key: HBASE-16583
> URL: https://issues.apache.org/jira/browse/HBASE-16583
> Project: HBase
> Issue Type: Umbrella
> Reporter: Phil Yang
>
> Staged Event-Driven Architecture (SEDA) splits request-handling logic into
> several stages, each stage is executed in a thread pool and they are
> connected by queues.
> Currently, in region server we use a thread pool to handle requests from
> client. The number of handlers is configurable, reading and writing use
> different pools. The current architecture has two limitations:
> Performance:
> Different part of the handling path has different bottleneck. For example,
> accessing MemStore and cache mainly consumes CPU but accessing HDFS mainly
> consumes network/disk IO. If we use SEDA and split them into two different
> stages, we can use different numbers for two pools according to the
> CPU/disk/network performance case by case.
> Availability:
> HBASE-16388 described a scene that if the client use a thread pool and use
> blocking methods to access region servers, only one slow server may exhaust
> most of threads of the client. For HBase, we are the client and HDFS
> datanodes are the servers. A slow datanode may exhaust most of handlers. The
> best way to resolve this issue is make HDFS requests non-blocking, which is
> exactly what SEDA does.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
