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https://issues.apache.org/jira/browse/HDFS-9314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15007597#comment-15007597
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Zhe Zhang commented on HDFS-9314:
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Thanks Xiao! +1 pending Jenkins.
My concern about other BPPs is that they potentially updates {{moreThanOne}}
and {{exactlyOne}}. So directly feeding {{exactlyOne}} to the new
{{chooseReplicaToDelete}} method bypasses the extra processing in
{{pickupReplicaSet}} in subclasses. But I don't think this should block this
JIRA anyway. Pinging [~mingma] for additional advice here.
> Improve BlockPlacementPolicyDefault's picking of excess replicas
> ----------------------------------------------------------------
>
> Key: HDFS-9314
> URL: https://issues.apache.org/jira/browse/HDFS-9314
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ming Ma
> Assignee: Xiao Chen
> Attachments: HDFS-9314.001.patch, HDFS-9314.002.patch
>
>
> The test case used in HDFS-9313 identified NullPointerException as well as
> the limitation of excess replica picking. If the current replicas are on
> {SSD(rack r1), DISK(rack 1), DISK(rack 2), DISK(rack 2)} and the storage
> policy changes to HOT_STORAGE_POLICY_ID, BlockPlacementPolicyDefault's won't
> be able to delete SSD replica.
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