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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7228) Add an SSD policy into the default BlockStoragePolicySuite
Date Mon, 13 Oct 2014 21:40:35 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated HDFS-7228:
----------------------------
    Attachment: HDFS-7228.001.patch

Thanks for the comments, Suresh! So in the new patch I just change the new policy to:
{code}
storageTypes=[SSD, DISK], 
creationFallbacks=[SSD, DISK],
replicationFallbacks=[SSD, DISK]
{code}
Thus the first replica will be placed in SSD, and the remaining will be on DISK. If the cluster
is run out of SSD, then DISK is used for both block allocation or replica recovery. This policy
also covers the scenario where DISK is unavailable (the policy falls back to SSD then) although
it is usually rare in practice.

> Add an SSD policy into the default BlockStoragePolicySuite
> ----------------------------------------------------------
>
>                 Key: HDFS-7228
>                 URL: https://issues.apache.org/jira/browse/HDFS-7228
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-7228.000.patch, HDFS-7228.001.patch
>
>
> Currently in the default BlockStoragePolicySuite, we've defined 4 storage policies: LAZY_PERSIST,
HOT, WARM, and COLD. Since we have already defined the SSD storage type, it will be useful
to also include a SSD related storage policy in the default suite.



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