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https://issues.apache.org/jira/browse/HBASE-14450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15427154#comment-15427154
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Ted Yu commented on HBASE-14450:
--------------------------------
Looking at a failed run:
{code}
2016-08-18 13:19:05,088 DEBUG [sync.4] wal.FSHLog$SyncRunner(1277): syncing
writer
hdfs://localhost:57146/user/tyu/test-data/7a216f31-59f4-462a-9041-1c4ab7411846/WALs/10.22.9.171,57156,
1471551472681/10.22.9.171%2C57156%2C1471551472681.regiongroup-2.1471551508287
2016-08-18 13:19:05,092 DEBUG [sync.0] wal.FSHLog$SyncRunner(1277): syncing
writer
hdfs://localhost:57146/user/tyu/test-data/7a216f31-59f4-462a-9041-1c4ab7411846/WALs/10.22.9.171,57156,
1471551472681/10.22.9.171%2C57156%2C1471551472681.regiongroup-2.1471551508287
...
2016-08-18 13:19:07,613 DEBUG [ProcedureExecutor-5]
mapreduce.MapReduceBackupCopyService(318): DistCp options:
[hdfs://localhost:57146/user/tyu/test-data/7a216f31-59f4-462a-9041-1c4ab7411846/
WALs/10.22.9.171,57154,1471551472088/10.22.9.171%2C57154%2C1471551472088.regiongroup-1.1471551477138,
hdfs://localhost:57146/user/tyu/test-data/7a216f31-59f4-462a-9041-1c4ab7411846/WALs/10.22.9.171,57156,1471551472681/10.22.9.171%2C57156%2C1471551472681.regiongroup-1.1471551479268,
hdfs://localhost:57146/user/tyu/test-data/7a216f31-59f4-462a-9041-1c4ab7411846/oldWALs/10.22.9.
171%2C57154%2C1471551472088.regiongroup-0.1471551507020,
hdfs://localhost:57146/user/tyu/test-data/7a216f31-59f4-462a-9041-1c4ab7411846/oldWALs/10.22.9.171%2C57156%2C1471551472681.regiongroup-0.1471551507020,
hdfs://localhost:57146/user/tyu/test-data/7a216f31-59f4-462a-9041-1c4ab7411846/oldWALs/10.22.9.171%2C57156%2C1471551472681.regiongroup-2.1471551501643,
hdfs://localhost:57146/user/tyu/test-data/7a216f31-59f4-462a-9041-1c4ab7411846/oldWALs/10.22.9.171%2C57156%2C1471551472681.regiongroup-3.1471551503093,
hdfs://localhost:57146/backupUT/backup_1471551545295/WALs]
{code}
The wal file being written to (additional rows) didn't appear in the list of
files to be copied by distcp.
> HBase Backup/Restore Phase 3: Multiwal support
> ----------------------------------------------
>
> Key: HBASE-14450
> URL: https://issues.apache.org/jira/browse/HBASE-14450
> Project: HBase
> Issue Type: Task
> Affects Versions: 2.0.0
> Reporter: Vladimir Rodionov
> Assignee: Ted Yu
> Labels: backup
> Fix For: 2.0.0
>
> Attachments: 14450-roll.v2.txt, 14450.roll-wait.txt, 14450.v2.txt,
> org.apache.hadoop.hbase.backup.TestIncrementalBackup-output.txt,
> testIncrementalBackup-8-15.txt, testIncrementalBackup-succ.txt
>
>
> We need to support multiwal configurations.
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