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From "Vladimir Rodionov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16455) Provide API for obtaining highest file number among all the WAL files
Date Sat, 20 Aug 2016 00:25:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429106#comment-15429106
] 

Vladimir Rodionov commented on HBASE-16455:
-------------------------------------------

{code}
+  /*
+   * @return the highest filenum among all the WAL files
+   */
+  long getHighestFilenum();
+
{code}

[~tedyu], I think, filenum should be explained (it is timestamp, when WAL was created). We
need better javadoc description here.

> Provide API for obtaining highest file number among all the WAL files
> ---------------------------------------------------------------------
>
>                 Key: HBASE-16455
>                 URL: https://issues.apache.org/jira/browse/HBASE-16455
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>             Fix For: 2.0.0, 1.4.0
>
>         Attachments: 16455.v1.txt
>
>
> Currently RegionServerServices has the following API:
> {code}
>   WAL getWAL(HRegionInfo regionInfo) throws IOException;
> {code}
> Caller can only obtain filenum for a specific WAL.
> When multi wal is in use, we should add API for obtaining highest file number among all
the outstanding WAL files.
> User can pass null to getWAL() method above, but the filenum for the returned WAL may
not be the highest among all the WAL files.
> See log snippet in the first comment.



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