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From "Thanh Do (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1380) The append pipeline does not followed TSP principal
Date Tue, 07 Sep 2010 21:36:34 GMT
The append pipeline does not followed TSP principal

                 Key: HDFS-1380
                 URL: https://issues.apache.org/jira/browse/HDFS-1380
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs client
    Affects Versions: 0.20-append
            Reporter: Thanh Do

1. Say we have 2 racks: rack-0 and rack-1. 
Rack-0 has dn1, dn2, dn3. Rack-0 has dn4, dn5, dn6.
2. Suppose client is in rack-0, and the write pipeline is:
client --> localnode --> other rack --> other rack
In this example we have the pipeline client-dn1-dn4-dn6.
That is rack0-rack0-rack1-rack1. So far so good.
3. Now other client comes, and append to file.
This client is also in rack-0. Interestingly,
the append pipeline is client-dn6-dn4-dn1.
That is the new client (from rack0) sends packet 
to the first node in pipeline (dn6) which belongs to rack1.

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