[
https://issues.apache.org/jira/browse/HBASE-1880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761436#action_12761436
]
Clint Morgan commented on HBASE-1880:
-------------------------------------
TestClient.testDeletes fails: Expected 1 key but received 2
at
org.apache.hadoop.hbase.client.TestClient.testDeletes(TestClient.java:1266)
I'll look into it tomorrow...
> DeleteColumns are not recovered properly from the write-ahead-log
> -----------------------------------------------------------------
>
> Key: HBASE-1880
> URL: https://issues.apache.org/jira/browse/HBASE-1880
> Project: Hadoop HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.20.0, 0.20.1, 0.21.0
> Reporter: Clint Morgan
> Priority: Critical
> Attachments: 1880-v2.patch, 1880.patch
>
>
> I found a couple of issues:
> - The timestamp is being set to now after it has been written to the wal. So
> if the WAL was flushed on that write, it gets in with ts of MAX_INT and is
> effectively lost.
> - Even after that fix, I had issues getting the delete to apply properly. In
> my case, the WAL had a put to a column, then a DeleteColumn for the same
> column. The DeleteColumn KV had a later timestamp, but it was still lost on
> recovery. I traced around a bit, and it looks like the current approach of
> just using an HFile.writer to write the set of KVs read from the log will not
> work. There is special logic in MemStore for deletes that needs to happen
> before writing. I got around this by just adding to memstore in the log
> recovery process. Not sure if there are other implications of this.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
