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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