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https://issues.apache.org/jira/browse/HDFS-16985?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chengwei Wang updated HDFS-16985:
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Description:
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
was:
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 and hasn't do
# check block file existing when BlockSender construction
# the EBS checking failed and throw FileNotFoundException
# DN invalidateBlock and schedule delete block async
> 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
>
> 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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