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Posted to hdfs-issues@hadoop.apache.org by "Junping Du (JIRA)" <ji...@apache.org> on 2017/01/06 08:40:59 UTC
[jira] [Updated] (HDFS-3702) Add an option for NOT writing the
blocks locally if there is a datanode on the same box as the client
[ https://issues.apache.org/jira/browse/HDFS-3702?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Junping Du updated HDFS-3702:
-----------------------------
Fix Version/s: (was: 2.9.0)
> Add an option for NOT writing the blocks locally if there is a datanode on the same box as the client
> -----------------------------------------------------------------------------------------------------
>
> Key: HDFS-3702
> URL: https://issues.apache.org/jira/browse/HDFS-3702
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.5.1
> Reporter: Nicolas Liochon
> Assignee: Lei (Eddy) Xu
> Priority: Minor
> Labels: BB2015-05-TBR
> Fix For: 2.8.0, 3.0.0-alpha1
>
> Attachments: HDFS-3702.000.patch, HDFS-3702.001.patch, HDFS-3702.002.patch, HDFS-3702.003.patch, HDFS-3702.004.patch, HDFS-3702.005.patch, HDFS-3702.006.patch, HDFS-3702.007.patch, HDFS-3702.008.patch, HDFS-3702.009.patch, HDFS-3702.010.patch, HDFS-3702.011.patch, HDFS-3702.012.patch, HDFS-3702_Design.pdf
>
>
> This is useful for Write-Ahead-Logs: these files are writen for recovery only, and are not read when there are no failures.
> Taking HBase as an example, these files will be read only if the process that wrote them (the 'HBase regionserver') dies. This will likely come from a hardware failure, hence the corresponding datanode will be dead as well. So we're writing 3 replicas, but in reality only 2 of them are really useful.
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