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https://issues.apache.org/jira/browse/HDFS-16180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Xie reassigned HDFS-16180:
-------------------------------
Assignee: Max Xie
> FsVolumeImpl.nextBlock should consider that the block meta file has been
> deleted.
> ---------------------------------------------------------------------------------
>
> Key: HDFS-16180
> URL: https://issues.apache.org/jira/browse/HDFS-16180
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.3.0, 3.4.0
> Reporter: Max Xie
> Assignee: Max Xie
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In my cluster, we found that when VolumeScanner run, sometime dn will throw
> some error log below
> ```
>
> 2021-08-19 08:00:11,549 INFO
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetAsyncDiskService:
> Deleted BP-1020175758-nnip-1597745872895 blk_1142977964_69237147 URI
> file:/disk1/dfs/data/current/BP-1020175758-
> nnip-1597745872895/current/finalized/subdir0/subdir21/blk_1142977964
> 2021-08-19 08:00:48,368 ERROR
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl:
> nextBlock(DS-060c8e4c-1ef6-49f5-91ef-91957356891a, BP-1020175758-
> nnip-1597745872895): I/O error
> java.io.IOException: Meta file not found,
> blockFile=/disk1/dfs/data/current/BP-1020175758-
> nnip-1597745872895/current/finalized/subdir0/subdir21/blk_1142977964
> at
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetUtil.findMetaFile(FsDatasetUtil.java:101)
> at
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl$BlockIteratorImpl.nextBlock(FsVolumeImpl.java:809)
> at
> org.apache.hadoop.hdfs.server.datanode.VolumeScanner.runLoop(VolumeScanner.java:528)
> at
> org.apache.hadoop.hdfs.server.datanode.VolumeScanner.run(VolumeScanner.java:628)
> 2021-08-19 08:00:48,368 WARN
> org.apache.hadoop.hdfs.server.datanode.VolumeScanner:
> VolumeScanner(/disk1/dfs/data, DS-060c8e4c-1ef6-49f5-91ef-91957356891a):
> nextBlock error on
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl$BlockIteratorImpl@7febc6b4
> ```
> When VolumeScanner scan block blk_1142977964, it has been deleted by
> datanode, scanner can not find the meta file of blk_1142977964, so it throw
> these error log.
>
> Maybe we should handle FileNotFoundException during nextblock to reduce error
> log and nextblock retry times.
>
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