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From "Liyin Liang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1583) Improve backup-node sync performance by wrapping RPC parameters
Date Tue, 22 Mar 2011 06:01:07 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Liyin Liang updated HDFS-1583:

    Status: Open  (was: Patch Available)

HADOOP-6949 has been accepted and committed.

> Improve backup-node sync performance by wrapping RPC parameters
> ---------------------------------------------------------------
>                 Key: HDFS-1583
>                 URL: https://issues.apache.org/jira/browse/HDFS-1583
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Liyin Liang
>            Assignee: Liyin Liang
>             Fix For: 0.23.0
>         Attachments: HDFS-1583-1.patch, HDFS-1583-2.patch, test-rpc.diff
> The journal edit records are sent by the active name-node to the backup-node with RPC:
> {code:}
>   public void journal(NamenodeRegistration registration,
>                       int jAction,
>                       int length,
>                       byte[] records) throws IOException;
> {code}
> During the name-node throughput benchmark, the size of byte array _records_ is around
*8000*.  Then the serialization and deserialization is time-consuming. I wrote a simple application
to test RPC with byte array parameter. When the size got to 8000, each RPC call need about
6 ms. While name-node sync 8k byte to local disk only need  0.3~0.4ms.

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