[jira] [Created] (HDFS-4988) Datanode must support all the volumes as individual storages

["Suresh Srinivas (JIRA)" <ji...@apache.org>]

Suresh Srinivas created HDFS-4988:
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             Summary: Datanode must support all the volumes as individual storages
                 Key: HDFS-4988
                 URL: https://issues.apache.org/jira/browse/HDFS-4988
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Suresh Srinivas


Currently all the volumes on datanode is reported as a single storage. This change proposes reporting them as individual storage. This requires:
# A unique storage ID for each storage
#* This needs to be generated during formatting
# There should be an option to allow existing disks to be reported as single storage unit for backward compatibility.
# A functionality is also needed to split the existing all volumes as single storage unit to to individual storage units.
# Configuration must allow for each storage unit a storage type attribute.
# Block reports must be sent on a per storage basis. In some cases (such memory tier) block reports may need to be sent more frequently. That means block reporting period must be on a per storage type basis.

My proposal is for new clusters to configure volumes by default as separate storage unit. Lets discuss.

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