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).
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
