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https://issues.apache.org/jira/browse/HDFS-13818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596456#comment-16596456
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Adam Antal commented on HDFS-13818:
-----------------------------------
Uploaded patch v2.
Incorporated the changes [~gabor.bota] you wrote, they were very helpful
indeed. Also run additional checkstyle for fixing (new) errors.
Added unit tests (set-get and simple checkers) for the created Corruption class
and whole functional tests for the new processor.
In fact, how the processor works and the usage haven't changed, so I refer the
reviewer to the still valid doc found in the uploads. Only minor things have
changed (update it later) like extra column was added to the output.
> Extend OIV to detect FSImage corruption
> ---------------------------------------
>
> Key: HDFS-13818
> URL: https://issues.apache.org/jira/browse/HDFS-13818
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: Adam Antal
> Assignee: Adam Antal
> Priority: Major
> Attachments: HDFS-13818.001.patch, HDFS-13818.002.patch,
> OIV_CorruptionDetector_processor.001.pdf
>
>
> A follow-up Jira for HDFS-13031: an improvement of the OIV is suggested for
> detecting corruptions like HDFS-13101 in an offline way.
> The reasoning is the following. Apart from a NN startup throwing the error,
> there is nothing in the customer's hand that could reassure him/her that the
> FSImages is good or corrupted.
> Although real full checking of the FSImage is only possible by the NN, for
> stack traces associated with the observed corruption cases the solution of
> putting up a tertiary NN is a little bit of overkill. The OIV would be a
> handy choice, already having functionality like loading the fsimage and
> constructing the folder structure, we just have to add the option of
> detecting the null INodes. For e.g. the Delimited OIV processor can already
> use in disk MetadataMap, which reduces memory consumption. Also there may be
> a window for parallelizing: iterating through INodes for e.g. could be done
> distributed, increasing efficiency, and we wouldn't need a high mem-high CPU
> setup for just checking the FSImage.
> The suggestion is to add a --detectCorruption option to the OIV which would
> check the FSImage for consistency.
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