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Posted to dev@hbase.apache.org by "Jingyun Tian (JIRA)" <ji...@apache.org> on 2017/05/27 03:52:04 UTC
[jira] [Created] (HBASE-18128) compaction marker could be skipped
Jingyun Tian created HBASE-18128:
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Summary: 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
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}
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