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From "Andrzej Bialecki (JIRA)" <>
Subject [jira] [Commented] (SOLR-9898) Documentation for metrics collection and /admin/metrics
Date Tue, 03 Jan 2017 16:30:58 GMT


Andrzej Bialecki  commented on SOLR-9898:

h1. Directory I/O metrics
Index storage (represented in Lucene/Solr by {{Directory}} abstraction) is monitored for I/O
throughput, which is optionally tracked per index file (see the previous section, {{directoryDetails}}
argument). As with the index-level metrics, these metrics are also registered in per-core

The following metrics are collected:
* {{}} - meter for total read bytes from the directory.
* {{}} - meter for total written bytes to the directory.

If {{directoryDetails}} is set to true the following additional metrics are collected (note:
this can potentially produce a lot of metrics so it should not be used in production):
* {{}} - histogram of read operation sizes (in byte units)
* {{}} - histogram of write operation sizes (in byte units)
* {{DIRECTORY.<file type>.reads}} - meter for read bytes per "file type". File type
is either {{segments}} for {{segments_N}} and {{pending_segments_N}}, or a file extension
(eg. {{fdt}}, {{doc}}, {{tim}}, etc). The number and type of these files vary depending on
the type of Lucene {{Codec}} used.
* {{DIRECTORY.<file type>.writes}} - meter for written bytes per "file type".
* {{DIRECTORY.<file type>.readSizes}} -  histogram of write operation sizes per "file
type" (in byte units).
* {{DIRECTORY.<file type>.writeSizes}} -  histogram of write operation sizes per "file
type" (in byte units).

> Documentation for metrics collection and /admin/metrics
> -------------------------------------------------------
>                 Key: SOLR-9898
>                 URL:
>             Project: Solr
>          Issue Type: Task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: documentation
>    Affects Versions: master (7.0), 6.4
>            Reporter: Andrzej Bialecki 
>            Assignee: Cassandra Targett
> Draft documentation follows.

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