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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7129) Metrics to track usage of memory for writes
Date Mon, 22 Sep 2014 23:06:34 GMT
Arpit Agarwal created HDFS-7129:

             Summary: Metrics to track usage of memory for writes
                 Key: HDFS-7129
                 URL: https://issues.apache.org/jira/browse/HDFS-7129
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode
    Affects Versions: HDFS-6581
            Reporter: Arpit Agarwal

A few metrics to evaluate feature usage and suggest improvements. Thanks to [~sureshms] for
some of these suggestions.

# Number of times a block in memory was read (before being ejected)
# Average block size for data written to memory tier
# Time the block was in memory before being ejected
# Number of blocks written to memory
# Number of memory writes requested but not satisfied (failed-over to disk)
# Number of blocks evicted without ever being read from memory
# Average delay between memory write and disk write (window where a node restart could cause
data loss).

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