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https://issues.apache.org/jira/browse/RATIS-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17103001#comment-17103001
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Hanisha Koneru commented on RATIS-923:
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Posted a PR with this approach.
{quote}1. Should the "largest index in closed segment" be updated during 
startup. If logs have been purged, how will cache eviction be affected.
{quote}
Updating the safeCacheEvictIndex on startup too. 
{quote}2. How will cache eviction be affected by snapshotIndex.
{quote}
The safeCacheEvitIndex = Max of SnapshotIndex and LastIndexInClosedSegments. 
When a new snapshot is installed, this index is also updated.

> Cache evicted before RollSegment completes
> ------------------------------------------
>
>                 Key: RATIS-923
>                 URL: https://issues.apache.org/jira/browse/RATIS-923
>             Project: Ratis
>          Issue Type: Bug
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> If a segment is evicted from Segment Cache before it is rolled over and 
> applyTransaction thread tries to read this segment, it can lead to 
> FileNotFoundException.
> Please refer to [~msingh]'s comment in HDDS-3382.



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