[jira] [Commented] (HBASE-19893) restore_snapshot is broken in master branch when region splits

["Ted Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-19893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16374665#comment-16374665 ] 

Ted Yu commented on HBASE-19893:
--------------------------------

I was able to reproduce the test failure without fix:
{code}
testRestoreSnapshotAfterSplittingRegions(org.apache.hadoop.hbase.client.TestRestoreSnapshotFromClient)  Time elapsed: 26.27 sec  <<< FAILURE!
java.lang.AssertionError: expected:<1000> but was:<939>
	at org.apache.hadoop.hbase.client.TestRestoreSnapshotFromClient.verifyRowCount(TestRestoreSnapshotFromClient.java:344)
	at org.apache.hadoop.hbase.client.TestRestoreSnapshotFromClient.testRestoreSnapshotAfterSplittingRegions(TestRestoreSnapshotFromClient.java:320)
{code}

> restore_snapshot is broken in master branch when region splits
> --------------------------------------------------------------
>
>                 Key: HBASE-19893
>                 URL: https://issues.apache.org/jira/browse/HBASE-19893
>             Project: HBase
>          Issue Type: Bug
>          Components: snapshots
>            Reporter: Toshihiro Suzuki
>            Assignee: Toshihiro Suzuki
>            Priority: Critical
>         Attachments: HBASE-19893.master.001.patch
>
>
> When I was investigating HBASE-19850, I found restore_snapshot didn't work in master branch.
>  
> Steps to reproduce are as follows:
> 1. Create a table
> {code:java}
> create "test", "cf"
> {code}
> 2. Load data (2000 rows) to the table
> {code:java}
> (0...2000).each{|i| put "test", "row#{i}", "cf:col", "val"}
> {code}
> 3. Split the table
> {code:java}
> split "test"
> {code}
> 4. Take a snapshot
> {code:java}
> snapshot "test", "snap"
> {code}
> 5. Load more data (2000 rows) to the table and split the table agin
> {code:java}
> (2000...4000).each{|i| put "test", "row#{i}", "cf:col", "val"}
> split "test"
> {code}
> 6. Restore the table from the snapshot 
> {code:java}
> disable "test"
> restore_snapshot "snap"
> enable "test"
> {code}
> 7. Scan the table
> {code:java}
> scan "test"
> {code}
> However, this scan returns only 244 rows (it should return 2000 rows) like the following:
> {code:java}
> hbase(main):038:0> scan "test"
> ROW COLUMN+CELL
>  row78 column=cf:col, timestamp=1517298307049, value=val
> ....
>   row999 column=cf:col, timestamp=1517298307608, value=val
> 244 row(s)
> Took 0.1500 seconds
> {code}
>  
> Also, the restored table should have 2 online regions but it has 3 online regions.
>  



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