[jira] [Resolved] (HDFS-17812) BlockIteratorImpl can miss blocks under certain conditions

["ZanderXu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-17812?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ZanderXu resolved HDFS-17812.
-----------------------------
    Resolution: Fixed

> BlockIteratorImpl can miss blocks under certain conditions
> ----------------------------------------------------------
>
>                 Key: HDFS-17812
>                 URL: https://issues.apache.org/jira/browse/HDFS-17812
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Felix N
>            Assignee: Felix N
>            Priority: Minor
>              Labels: pull-request-available
>
> # BlockIteratorImpl#getSubdirEntries sorts by strings, meaning subdir20 comes before subdir4, which can result in a bigger block id being listed before a smaller block id
>  # If block cleanup happens before state.curEntry is reset to null, stale data can carry over into the next loop
>  # Search for a bigger ID than the range in nextSorted(entries, state.curEntry) -> null -> subdir is skipped.
> Usually happens during DiskBalancer operations.



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