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https://issues.apache.org/jira/browse/HDFS-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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fatkun updated HDFS-12209:
--------------------------
    Attachment: HDFS-12209.002.patch

lastSavedMs use monotonic time, and not save in file.

> VolumeScanner scan cursor not save periodic
> -------------------------------------------
>
>                 Key: HDFS-12209
>                 URL: https://issues.apache.org/jira/browse/HDFS-12209
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>    Affects Versions: 2.6.0
>         Environment: cdh5.4.0
>            Reporter: fatkun
>         Attachments: HDFS-12209.002.patch, HDFS-12209.patch
>
>
> The bug introduce from HDFS-7430 , the time is not same, one is monotonicMs 
> and other is clock time. It should use Time.now() both
> VolumeScanner.java
> {code:java}
>         long saveDelta = monotonicMs - curBlockIter.getLastSavedMs();
>         if (saveDelta >= conf.cursorSaveMs) {
>           LOG.debug("{}: saving block iterator {} after {} ms.",
>                   this, curBlockIter, saveDelta);
>           saveBlockIterator(curBlockIter);
>         }
> {code}
> curBlockIter.getLastSavedMs() init here
> FsVolumeImpl.java
> {code:java}
>     BlockIteratorState() {
>       lastSavedMs = iterStartMs = Time.now();
>       curFinalizedDir = null;
>       curFinalizedSubDir = null;
>       curEntry = null;
>       atEnd = false;
>     }
> {code}



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