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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17330) SnapshotFileCache will always refresh the file cache
Date Thu, 22 Dec 2016 17:42:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15770633#comment-15770633
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stack commented on HBASE-17330:
-------------------------------

[~cuijianwei] Have you tried your fix? Is mod time reliable?

> SnapshotFileCache will always refresh the file cache
> ----------------------------------------------------
>
>                 Key: HBASE-17330
>                 URL: https://issues.apache.org/jira/browse/HBASE-17330
>             Project: HBase
>          Issue Type: Bug
>          Components: snapshots
>    Affects Versions: 2.0.0, 1.3.1, 0.98.23
>            Reporter: Jianwei Cui
>            Assignee: Jianwei Cui
>            Priority: Minor
>             Fix For: 2.0.0, 1.4.0
>
>         Attachments: HBASE-17330-v1.patch, HBASE-17330-v2.patch
>
>
> In {{SnapshotFileCache#refreshCache}}, the {{hasChanges}} will be judged as:
> {code}
>     try {
>       FileStatus dirStatus = fs.getFileStatus(snapshotDir);
>       lastTimestamp = dirStatus.getModificationTime();
>       hasChanges |= (lastTimestamp >= lastModifiedTime); // >= will make hasChanges
always be true
> {code}
> The  {{(lastTimestamp >= lastModifiedTime)}} will make {{hasChanges}} always be true
because {{lastTimestamp}} will be updated as:
> {code}
> this.lastModifiedTime = lastTimestamp;
> {code}
> So, SnapshotFileCache will always refresh the file cache.



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