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From "Zhihong Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1783) Ability for HDFS client to write replicas in parallel
Date Wed, 20 Jun 2012 22:01:43 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397927#comment-13397927
] 

Zhihong Ted Yu commented on HDFS-1783:
--------------------------------------

{code}
+        for (curNode = 0; curNode < length;  curNode++) {
+          assert null == s : "Previous socket unclosed";
+          Socket s;
+          s = createSocketForPipeline(nodes[0], nodes.length, dfsClient);
{code}
Should the last line above read 'nodes[curNode], ...' ?
                
> Ability for HDFS client to write replicas in parallel
> -----------------------------------------------------
>
>                 Key: HDFS-1783
>                 URL: https://issues.apache.org/jira/browse/HDFS-1783
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>            Reporter: dhruba borthakur
>            Assignee: Lars Hofhansl
>         Attachments: HDFS-1783-trunk-v2.patch, HDFS-1783-trunk-v3.patch, HDFS-1783-trunk-v4.patch,
HDFS-1783-trunk-v5.patch, HDFS-1783-trunk.patch
>
>
> The current implementation of HDFS pipelines the writes to the three replicas. This introduces
some latency for realtime latency sensitive applications. An alternate implementation that
allows the client to write all replicas in parallel gives much better response times to these
applications. 

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