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https://issues.apache.org/jira/browse/HDFS-12225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16110277#comment-16110277
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Xiao Chen commented on HDFS-12225:
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I encountered the same problem in HDFS-10899, and had to do 'intermittent
processing' as you said. What I did was basically keep the inode id of the
directories when loading fsimage, and after the regular sections are loaded,
process the directories corresponding to the inode ids. At this point they all
have their children inodes loaded.
Maybe we can add a more standard / elegant way to do this generally. :)
> [SPS]: Optimize extended attributes for tracking SPS movements
> --------------------------------------------------------------
>
> Key: HDFS-12225
> URL: https://issues.apache.org/jira/browse/HDFS-12225
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, namenode
> Reporter: Uma Maheswara Rao G
> Assignee: Surendra Singh Lilhore
>
> We have discussed to optimize number extended attributes and asked to report
> separate JIRA while implementing [HDFS-11150 |
> https://issues.apache.org/jira/browse/HDFS-11150?focusedCommentId=15766127&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15766127]
> This is the JIRA to track that work
> For the context, comment copied from HDFS-11150
> {quote}
> [~yuanbo] wrote : I've tried that before. There is an issue here if we only
> mark the directory. When recovering from FsImage, the InodeMap isn't built
> up, so we don't know the sub-inode of a given inode, in the end, We cannot
> add these inodes to movement queue in FSDirectory#addToInodeMap, any
> thoughts?{quote}
> {quote}
> [~umamaheswararao] wrote: I got what you are saying. Ok for simplicity we can
> add for all Inodes now. For this to handle 100%, we may need intermittent
> processing, like first we should add them to some intermittentList while
> loading fsImage, once fully loaded and when starting active services, we
> should process that list and do required stuff. But it would add some
> additional complexity may be. Let's do with all file inodes now and we can
> revisit later if it is really creating issues. How about you raise a JIRA for
> it and think to optimize separately?
> {quote}
> {quote}
> [~andrew.wang] wrote in HDFS-10285 merge time review comment : HDFS-10899
> also the cursor of the iterator in the EZ root xattr to track progress and
> handle restarts. I wonder if we can do something similar here to avoid having
> an xattr-per-file being moved.
> {quote}
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