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From "Arshak Navruzyan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-2223) minor corrections to 1.5 documentation regarding WAL
Date Sat, 18 Jan 2014 16:14:19 GMT
Arshak Navruzyan created ACCUMULO-2223:
------------------------------------------

             Summary: minor corrections to 1.5 documentation regarding WAL
                 Key: ACCUMULO-2223
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2223
             Project: Accumulo
          Issue Type: Improvement
    Affects Versions: 1.5.0, 1.5.1, 1.6.0, 1.6.1, 1.7.0
            Reporter: Arshak Navruzyan
            Assignee: Arshak Navruzyan
            Priority: Minor
             Fix For: 1.5.1


A few paragraphs in the documentation suggest that the WAL is created locally and only copied
to HDFS for/during recovery. 

2.8. Fault-Tolerance
The Master will coordinate the copying of write-ahead logs to HDFS so the logs are available
to all tablet servers.

11.10. Recovery
Recovery is performed by asking the loggers to copy their write-ahead logs into HDFS. As the
logs are copied, they are also sorted, so that tablets can easily find their missing updates.
The copy/sort status of each file is displayed on Accumulo monitor status page. 



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