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https://issues.apache.org/jira/browse/HDFS-11160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15749708#comment-15749708
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Hadoop QA commented on HDFS-11160:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 8s{color}
| {color:red} HDFS-11160 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-11160 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12843304/HDFS-11160.007.patch |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/17859/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT http://yetus.apache.org |
This message was automatically generated.
> VolumeScanner reports write-in-progress replicas as corrupt incorrectly
> -----------------------------------------------------------------------
>
> Key: HDFS-11160
> URL: https://issues.apache.org/jira/browse/HDFS-11160
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Environment: CDH5.7.4
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Attachments: HDFS-11160.001.patch, HDFS-11160.002.patch,
> HDFS-11160.003.patch, HDFS-11160.004.patch, HDFS-11160.005.patch,
> HDFS-11160.006.patch, HDFS-11160.007.patch, HDFS-11160.reproduce.patch
>
>
> Due to a race condition initially reported in HDFS-6804, VolumeScanner may
> erroneously detect good replicas as corrupt. This is serious because in some
> cases it results in data loss if all replicas are declared corrupt. This bug
> is especially prominent when there are a lot of append requests via
> HttpFs/WebHDFS.
> We are investigating an incidence that caused very high block corruption rate
> in a relatively small cluster. Initially, we thought HDFS-11056 is to blame.
> However, after applying HDFS-11056, we are still seeing VolumeScanner
> reporting corrupt replicas.
> It turns out that if a replica is being appended while VolumeScanner is
> scanning it, VolumeScanner may use the new checksum to compare against old
> data, causing checksum mismatch.
> I have a unit test to reproduce the error. Will attach later. A quick and
> simple fix is to hold FsDatasetImpl lock and read from disk the checksum.
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