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Posted to hdfs-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2023/05/04 02:50:00 UTC
[jira] [Commented] (HDFS-16985) delete local block file when FileNotFoundException occurred may lead to missing block.
[ https://issues.apache.org/jira/browse/HDFS-16985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17719127#comment-17719127 ]
ASF GitHub Bot commented on HDFS-16985:
---------------------------------------
smarthanwang commented on PR #5564:
URL: https://github.com/apache/hadoop/pull/5564#issuecomment-1534009914
@Hexiaoqiao fixed style issues，please take a look.
> delete local block file when FileNotFoundException occurred may lead to missing block.
> --------------------------------------------------------------------------------------
>
> Key: HDFS-16985
> URL: https://issues.apache.org/jira/browse/HDFS-16985
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: Chengwei Wang
> Assignee: Chengwei Wang
> Priority: Major
> Labels: pull-request-available
>
> We encounterd several missing-block problem in our production cluster which hdfs running on AWS EC2 + EBS.
> The root cause：
> # the block remains only 1 replication left and hasn't been reconstruction
> # DN checks block file existing when BlockSender construction
> # the EBS checking failed and throw FileNotFoundException (EBS may be in fault condition)
> # DN invalidateBlock and schedule block async deletion
> # EBS already back to normal when DN do delete block
> # the block file be delete permanently and can't be recovered
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