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https://issues.apache.org/jira/browse/HDFS-7228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-7228:
----------------------------
Attachment: HDFS-7228.000.patch
The patch adds a new storage policy named "SSD":
{code}
new BlockStoragePolicy(id, "SSD",
new StorageType[]{StorageType.SSD}, new StorageType[]{StorageType.DISK},
new StorageType[]{StorageType.DISK});
{code}
I.e., we have:
1. For new allocated blocks, the policy tries to place all replicas on SSD
2. If #2 fails because SSD is unavailable, fall back to DISK
3. For under-replicated block recovery, if SSD is unavailable, fall back to DISK
Also use this chance to move the predefined policies' names into HdfsConstants.
> 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
>
>
> 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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