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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-578) consider using hdfs for the walog
Date Mon, 07 May 2012 14:48:50 GMT
Eric Newton created ACCUMULO-578:
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             Summary: consider using hdfs for the walog
                 Key: ACCUMULO-578
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-578
             Project: Accumulo
          Issue Type: Improvement
          Components: logger, tserver
    Affects Versions: 1.5.0-SNAPSHOT
            Reporter: Eric Newton
            Assignee: Eric Newton


Using HDFS for walogs would fix:
 * ACCUMULO-84: any node can read the replicated files
 * ACCUMULO-558: wouldn't need to monitor loggers
 * ACCUMULO-544: log references wouldn't include hostnames
 * ACCUMULO-423: wouldn't need to monitor loggers
 * ACCUMULO-258: hdfs has load balancing already

To implement it, we would need the ability to distribute log sorts.

Continuing to use loggers helps us avoid:
 * hdfs pipeline strategy
 * we don't have fine-grained insight when a single node makes dfs slow
 * additional namenode pressure
 * flexibility: for example, we can add fadvise() calls to the logger before HDFS supports
it


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