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https://issues.apache.org/jira/browse/HDFS-7343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15970253#comment-15970253
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Rakesh R commented on HDFS-7343:
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bq. It also can bring performance issue. For example, if a rule only cares the
last 5s data, then the whole large table will be scanned in order to filter out
the records needed.
Thanks [~zhouwei] for the example. I understand, SSM will have the data
aggregation function to keep data volume under control and the aggregation
window plays an important role in this module. Since this is a
performance-centric area, just a suggestion to keep the database module
interface(store/retrieve/aggregation functions) pluggable during implementation
so that one can do necessary changes(later) based on the test results.
> HDFS smart storage management
> -----------------------------
>
> Key: HDFS-7343
> URL: https://issues.apache.org/jira/browse/HDFS-7343
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Kai Zheng
> Assignee: Wei Zhou
> Attachments: access_count_tables.jpg,
> HDFSSmartStorageManagement-General-20170315.pdf,
> HDFS-Smart-Storage-Management.pdf,
> HDFSSmartStorageManagement-Phase1-20170315.pdf,
> HDFS-Smart-Storage-Management-update.pdf, move.jpg, tables_in_ssm.xlsx
>
>
> As discussed in HDFS-7285, it would be better to have a comprehensive and
> flexible storage policy engine considering file attributes, metadata, data
> temperature, storage type, EC codec, available hardware capabilities,
> user/application preference and etc.
> Modified the title for re-purpose.
> We'd extend this effort some bit and aim to work on a comprehensive solution
> to provide smart storage management service in order for convenient,
> intelligent and effective utilizing of erasure coding or replicas, HDFS cache
> facility, HSM offering, and all kinds of tools (balancer, mover, disk
> balancer and so on) in a large cluster.
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