[jira] [Updated] (HDFS-16622) addRDBI in IncrementalBlockReportManager may remove the block with bigger GS.

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-16622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated HDFS-16622:
----------------------------------
    Labels: pull-request-available  (was: )

> addRDBI in IncrementalBlockReportManager may remove the block with bigger GS.
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-16622
>                 URL: https://issues.apache.org/jira/browse/HDFS-16622
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: ZanderXu
>            Assignee: ZanderXu
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> In our production environment,  there is a strange missing block, according to the log, I suspect there is a bug in function addRDBI(ReceivedDeletedBlockInfo rdbi,DatanodeStorage storage)(line 250).
> Bug code in the for loop:
> {code:java}
> synchronized void addRDBI(ReceivedDeletedBlockInfo rdbi,
>       DatanodeStorage storage) {
>     // Make sure another entry for the same block is first removed.
>     // There may only be one such entry.
>     for (PerStorageIBR perStorage : pendingIBRs.values()) {
>       if (perStorage.remove(rdbi.getBlock()) != null) {
>         break;
>       }
>     }
>     getPerStorageIBR(storage).put(rdbi);
>   }
> {code}
> Removed the GS of the Block in ReceivedDeletedBlockInfo may be greater than the GS of the Block in rdbi. And NN will invalidate the Replicate will small GS when complete one block. 
> So If there is only one replicate for one block, there is a possibility of missingblock because of this wrong logic. 



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