hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "bc Wong (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-941) Datanode xceiver protocol should allow reuse of a connection
Date Fri, 30 Apr 2010 20:59:02 GMT

     [ https://issues.apache.org/jira/browse/HDFS-941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

bc Wong updated HDFS-941:
-------------------------

    Attachment: HDFS-941-4.patch

bq. (Eli) Maybe better name for DN_KEEPALIVE_TIMEOUT since there is no explicit keepalive?
TRANSFER_TIMEOUT?

The keepalive is not explicit. But that's essentially what the DN is doing. I find it more
descriptive. TRANSFER_TIMEOUT sounds like timeout in the middle of a transfer.

New -4 patch per Eli's comments.

> Datanode xceiver protocol should allow reuse of a connection
> ------------------------------------------------------------
>
>                 Key: HDFS-941
>                 URL: https://issues.apache.org/jira/browse/HDFS-941
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, hdfs client
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: bc Wong
>         Attachments: HDFS-941-1.patch, HDFS-941-2.patch, HDFS-941-3.patch, HDFS-941-3.patch,
HDFS-941-4.patch
>
>
> Right now each connection into the datanode xceiver only processes one operation.
> In the case that an operation leaves the stream in a well-defined state (eg a client
reads to the end of a block successfully) the same connection could be reused for a second
operation. This should improve random read performance significantly.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message