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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19166) Add translation for handling hbase.regionserver.wal.WALEdit
Date Fri, 03 Nov 2017 20:27:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16238304#comment-16238304
] 

Josh Elser commented on HBASE-19166:
------------------------------------

bq. Such translation code needs to be in 1.x and 2.0, right (region server reading other version's
WAL) ?

Would we really need HBase 1 to read HBase 2 WALs? Didn't we say on the mailing list that
downgrades were a non-goal?

> Add translation for handling hbase.regionserver.wal.WALEdit
> -----------------------------------------------------------
>
>                 Key: HBASE-19166
>                 URL: https://issues.apache.org/jira/browse/HBASE-19166
>             Project: HBase
>          Issue Type: Bug
>          Components: wal
>            Reporter: Ted Yu
>            Assignee: stack
>            Priority: Blocker
>             Fix For: 2.0.0-beta-1
>
>
> For hlog generated by 1.x, using WALPlayer from hbase2 would result in:
> {code}
> 2017-11-02 21:22:40,907 INFO  [main] mapreduce.Job: Task Id : attempt_1509641483571_0003_m_000000_0,
Status : FAILED
> Error: java.lang.ClassCastException: org.apache.hadoop.hbase.regionserver.wal.WALEdit
cannot be cast to org.apache.hadoop.hbase.wal.WALEdit
>         at org.apache.hadoop.hbase.mapreduce.WALPlayer$WALCellMapper.map(WALPlayer.java:143)
>         at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:793)
> {code}
> HBASE-16479 relocated WALEdit.
> Chatting with Enis, he mentioned adding translation for handling hbase.regionserver.wal.WALEdit
> This way, WAL from 1.x can be recognized by hbase-2



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