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Jingyun Tian commented on HBASE-18128: -------------------------------------- [~tedyu] please check this out, thx > compaction marker could be skipped > ----------------------------------- > > Key: HBASE-18128 > URL: https://issues.apache.org/jira/browse/HBASE-18128 > Project: HBase > Issue Type: Improvement > Components: Compaction, regionserver > Reporter: Jingyun Tian > Assignee: Jingyun Tian > Attachments: HBASE-18128-master.patch, HBASE-18128-master-v2.patch, > TestCompactionMarker.java > > > The sequence for a compaction are as follows: > 1. Compaction writes new files under region/.tmp directory (compaction output) > 2. Compaction atomically moves the temporary file under region directory > 3. Compaction appends a WAL edit containing the compaction input and output > files. Forces sync on WAL. > 4. Compaction deletes the input files from the region directory. > But if a flush happened between 3 and 4, then the regionserver crushed. The > compaction marker will be skipped when splitting log because the sequence id > of compaction marker is smaller than lastFlushedSequenceId. > {code} > if (lastFlushedSequenceId >= entry.getKey().getLogSeqNum()) { > editsSkipped++; > continue; > } > {code} -- This message was sent by Atlassian JIRA (v6.4.14#64029)