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https://issues.apache.org/jira/browse/HBASE-14497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14934818#comment-14934818
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Yerui Sun commented on HBASE-14497:
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I think testEnableTableWithNoRegionServers is not a stable test.
I ran it several times on branch-1 with git commit
642273bc2a5a415eba6f1592a439a6b2b53a70a9, without this patch. It failed in most
times, but indeed succeeded in few times. I settle breakpoints on the entry of
seekToPreviousRow of MemstoreScanner&StoreFileScanner, and found that only two
calling to seekToPreviousRow for hbase:namespace, one calling return true and
another return false, neither called recursively.
I also ran it with this patch, and got the same result. Most of times the test
failed, and succeeded in few times.
I think there’s another problem in the test, and not related to my patch.
> Reverse Scan threw StackOverflow caused by readPt checking
> ----------------------------------------------------------
>
> Key: HBASE-14497
> URL: https://issues.apache.org/jira/browse/HBASE-14497
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.0.0, 0.98.14, 1.3.0
> Reporter: Yerui Sun
> Attachments: HBASE-14497-0.98.patch, HBASE-14497-branch-1-v2.patch,
> HBASE-14497-branch-1.patch, HBASE-14497-master-v2.patch,
> HBASE-14497-master-v3.patch, HBASE-14497-master-v3.patch,
> HBASE-14497-master-v4.patch, HBASE-14497-master.patch
>
>
> I met stack overflow error in StoreFileScanner.seekToPreviousRow using
> reversed scan. I searched and founded HBASE-14155, but it seems to be a
> different reason.
> The seekToPreviousRow will fetch the row which closest before, and compare
> mvcc to the readPt, which acquired when scanner created. If the row's mvcc is
> bigger than readPt, an recursive call of seekToPreviousRow will invoked, to
> find the next closest before row.
> Considering we created a scanner for reversed scan, and some data with
> smaller rows was written and flushed, before calling scanner next. When
> seekToPreviousRow was invoked, it would call itself recursively, until all
> rows which written after scanner created were iterated. The depth of
> recursive calling stack depends on the count of rows, the stack overflow
> error will be threw if the count of rows is large, like 10000.
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