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From "Ravi Phulari (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-555) A few improvements to DataNodeCluster - HADOOP-5556
Date Wed, 07 Oct 2009 19:13:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763199#action_12763199

Ravi Phulari commented on HDFS-555:

We need to commit this patch to branch 20, 21 and trunk .
Ant test-patch passed against branch 20 . I will upload ant test-patch log and patch for branch
20 . 

Also, later  I will upload patch for branch 21 and trunk.

> 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: Hairong Kuang
>            Priority: Blocker
>             Fix For: 0.21.0
>         Attachments: HDFS-555-v1.patch, 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 We should
allow to set its address to 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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