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From "binlijin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16931) Cleaned seqid in compaction should set back when write finish.
Date Mon, 24 Oct 2016 04:27:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15600904#comment-15600904
] 

binlijin commented on HBASE-16931:
----------------------------------

And this compaction exception cause 100+ regionservers down in one of our production cluster.

> Cleaned seqid in compaction should set back when write finish.
> --------------------------------------------------------------
>
>                 Key: HBASE-16931
>                 URL: https://issues.apache.org/jira/browse/HBASE-16931
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 2.0.0
>            Reporter: binlijin
>            Assignee: binlijin
>
> Compactor#performCompaction
>       do {
>         hasMore = scanner.next(cells, scannerContext);
>         // output to writer:
>         for (Cell c : cells) {
>           if (cleanSeqId && c.getSequenceId() <= smallestReadPoint) {
>             CellUtil.setSequenceId(c, 0);
>           }
>           writer.append(c);
>         }
>         cells.clear();
>       } while (hasMore);
> scanner.next will choose at most "hbase.hstore.compaction.kv.max" kvs, the last cell
still reference by StoreScanner.prevCell, so if cleanSeqId is called when the scanner.next
call StoreScanner.checkScanOrder may throw exception and cause regionserver down.



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