[ https://issues.apache.org/jira/browse/IMPALA-9471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Joe McDonnell updated IMPALA-9471: ---------------------------------- Summary: Improve data cache metrics (was: To monitor the data cache, there are several improvements to metrics that would help. This tracks all the distinct metrics changes.) > Improve data cache metrics > -------------------------- > > Key: IMPALA-9471 > URL: https://issues.apache.org/jira/browse/IMPALA-9471 > Project: IMPALA > Issue Type: Epic > Components: Backend > Affects Versions: Impala 3.4.0 > Reporter: Joe McDonnell > Assignee: Joe McDonnell > Priority: Major > > Currently, the data cache has the following metrics: > {noformat} > impala-server.io-mgr.remote-data-cache-hit-bytes > impala-server.io-mgr.remote-data-cache-miss-bytes > impala-server.io-mgr.remote-data-cache-total-bytes > impala-server.io-mgr.remote-data-cache-dropped-byte{noformat} > There are several questions that these metrics will not answer, especially > when we start to consider changes to eviction algorithms. Here are some > questions that we may want to be able to answer: > # How much memory is being used to track metadata? > # What is the distribution of size of entries in the cache? > # How many entries are in the cache? > # What are the hit/miss counts (as opposed to the hit bytes)? > # What is the actual disk usage (as seen by the OS)? > This is an epic to track adding metrics to answer these questions (and other > similar questions). -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org