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https://issues.apache.org/jira/browse/HDFS-17401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17821441#comment-17821441
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ASF GitHub Bot commented on HDFS-17401:
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RuinanGu opened a new pull request, #6597:
URL: https://github.com/apache/hadoop/pull/6597
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### Description of PR
jira: [https://issues.apache.org/jira/browse/HDFS-17401](url)
Excess internal block can't be deleted correctly when it's stored in
fallback storage.
Simple case:
EC-RS-6-3-1024k file is stored using ALL_SSD storage policy(SSD is default
storage type and DISK is fallback storage type), if the block group is as
follows
[0(SSD), 0(SSD), 1(SSD), 2(SSD), 3(SSD), 4(SSD), 5(SSD), 6(SSD), 7(SSD),
8(DISK)]
The are two index 0 internal block and one of them should be chosen to
delete.But the current implement chooses the index 0 internal blocks as
candidates but DISK as exess storage type.As a result, the exess storage
type(DISK) can not correspond to the exess internal blocks' storage type(SSD)
correctly, and the exess internal block can not be deleted correctly.
> Erasure Coding: Excess internal block may not be able to be deleted correctly
> when it's stored in fallback storage
> ------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-17401
> URL: https://issues.apache.org/jira/browse/HDFS-17401
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.3.6
> Reporter: Ruinan Gu
> Assignee: Ruinan Gu
> Priority: Major
>
> Excess internal block can't be deleted correctly when it's stored in fallback
> storage.
> Simple case:
> EC-RS-6-3-1024k file is stored using ALL_SSD storage policy(SSD is default
> storage type and DISK is fallback storage type), if the block group is as
> follows
> [0(SSD), 0(SSD), 1(SSD), 2(SSD), 3(SSD), 4(SSD), 5(SSD), 6(SSD), 7(SSD),
> 8(DISK)]
> The are two index 0 internal block and one of them should be chosen to
> delete.But the current implement chooses the index 0 internal blocks as
> candidates but DISK as exess storage type.As a result, the exess storage
> type(DISK) can not correspond to the exess internal blocks' storage type(SSD)
> correctly, and the exess internal block can not be deleted correctly.
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