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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HDFS-555) A few improvements to DataNodeCluster - HADOOP-5556
Date Wed, 07 Oct 2009 20:29:31 GMT

     [ https://issues.apache.org/jira/browse/HDFS-555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang reassigned HDFS-555:
----------------------------------

    Assignee: Ravi Phulari  (was: Hairong Kuang)

> Also, the patches are submitted by Ravi, but the JIRA is assigned to Hairong. I'm not
sure if this is incorrect or not - just pointing out.
I submitted an initial patch to the original jira. That's why my name appeared as the assignee.
Thanks Ravi for working on this. I am assigning this jira to you.

> A few improvements to DataNodeCluster - HADOOP-5556 
> ----------------------------------------------------
>
>                 Key: HDFS-555
>                 URL: https://issues.apache.org/jira/browse/HDFS-555
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: test
>    Affects Versions: 0.21.0
>            Reporter: Ravi Phulari
>            Assignee: Ravi Phulari
>            Priority: Blocker
>             Fix For: 0.21.0
>
>         Attachments: HDFS-555-0.20.patch, HDFS-555-v1.patch, HDFS-555.0.20-test-patch.log,
HDFS-555.patch
>
>
> Opening jira to address HDFS code changes made in HADOOP-5556.
> DataNodeCluster is a great tool to simulate a large scale DFS cluster using a small set
of machines. A few suggestions to improve this tool:
>    1. DataNodeCluster uses MiniDFSCluster#startDataNode to start multiple instances of
DataNode on one machine. MiniDFSCluster sets DataNode's address to be 127.0.0.1. We should
allow to set its address to 0.0.0.0 so DataNodes in different machines could communicate.
>    2. Currently the size of the blocks injected to DataNode and created in CreatedEditsLog
is hardcoded as 10. It would be more convenient if this could be configurable. Also we need
to make sure that both use the same block size.
>    3. If the replication factor of blocks is larger than 1, currently a DataNode in DataNodeCluster
will be injected blocks multiple times and therefore it sends block reports to NameNode multiple
times. Initial block reports contain only a portion of its blocks and therefore may cause
unnecessary block replications. It would be cleaner if only one block report with all its
blocks is sent.

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