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https://issues.apache.org/jira/browse/HDFS-9173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14960115#comment-14960115
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Walter Su commented on HDFS-9173:
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bq. #2. about {{syncBlockFinalized}}, {{syncBlockUnfinalized}}.
Unfortunately, The logic isn't quite the same between contiguous and striped.
For example,
{noformat}
blk_0 blk_1 blk_2 blk_3 blk_4 blk_5 blk_6 blk_7 blk_8
64k 64k 64k 64k 64k 64k 64k 64k 64k
64k ___ ___ ___ ___ 64k 64k 64k 64k
{noformat}
blk_0, blk5~8 are finalized, blk1~4 are RBW. In this case, the last cell of
blk_5 is garbage, should be truncated. Because the data isn't sequential in
last stripe and can't decode. So I have to keep blk_0, truncate blk_5, and
re-encode blk_6~8 (I'm talking about last cells). (It's done in step 4) So I
don't care too much whether it's finalized or not.
For contiguous blocks, If it finds a finalized, it keeps the finalized.
> Erasure Coding: Lease recovery for striped file
> -----------------------------------------------
>
> Key: HDFS-9173
> URL: https://issues.apache.org/jira/browse/HDFS-9173
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Walter Su
> Assignee: Walter Su
> Attachments: HDFS-9173.00.wip.patch, HDFS-9173.01.patch,
> HDFS-9173.02.step125.patch, HDFS-9173.03.patch, HDFS-9173.04.patch
>
>
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