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.
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