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https://issues.apache.org/jira/browse/HADOOP-4945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660106#action_12660106
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dhruba borthakur commented on HADOOP-4945:
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Hello zhangwei, thanks for looking into whether the "mode2" functionality be
incorporated into fsck itself (without making the fsck code much more
complicated).
> Add BlockTool to query file and its block info
> ----------------------------------------------
>
> Key: HADOOP-4945
> URL: https://issues.apache.org/jira/browse/HADOOP-4945
> Project: Hadoop Core
> Issue Type: New Feature
> Affects Versions: site
> Reporter: zhangwei
> Fix For: site
>
> Attachments: HADOOP-4945.patch
>
>
> The fsck can get the file's block detail,but when you want see which file or
> datanode the block belongs to ,it will be helpless.
> The BlockTool will be helpfull in developing,for example when you happened
> to these message :
> 2008-12-25 12:12:10,049 WARN dfs.DataNode (DataNode.java:readBlock(901)) -
> Got exception while serving blk_28622148 to /10.7
> 3.4.101:
> java.io.IOException: Block blk_28622148 is not valid.
> at org.apache.hadoop.dfs.FSDataset.getBlockFile(FSDataset.java:541)
> at
> org.apache.hadoop.dfs.DataNode$BlockSender.<init>(DataNode.java:1090)
> at
> org.apache.hadoop.dfs.DataNode$DataXceiver.readBlock(DataNode.java:882)
> at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:840)
> at java.lang.Thread.run(Thread.java:595)
> the Blocktool may help you to get the location,it can get the file name and
> which datanodes hold the block.
> Also it can get the file or directory 's block details too.
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