mikewalch commented on a change in pull request #549: ACCUMULO-4074 Added
support for multiple scan executors
URL: https://github.com/apache/accumulo/pull/549#discussion_r200711953
##########
File path: core/src/main/java/org/apache/accumulo/core/conf/Property.java
##########
@@ -430,12 +433,33 @@
"When a tablet server's SimpleTimer thread triggers to check idle"
+ " sessions, this configurable option will be used to evaluate
update"
+ " sessions to determine if they can be closed due to inactivity"),
+ @Deprecated
TSERV_READ_AHEAD_MAXCONCURRENT("tserver.readahead.concurrent.max", "16",
PropertyType.COUNT,
- "The maximum number of concurrent read ahead that will execute. This
effectively"
- + " limits the number of long running scans that can run
concurrently per tserver."),
+ "This property is deprecated, use tserver.scan.executors.default.threads
instead."),
+ @Deprecated
TSERV_METADATA_READ_AHEAD_MAXCONCURRENT("tserver.metadata.readahead.concurrent.max",
"8",
PropertyType.COUNT,
- "The maximum number of concurrent metadata read ahead that will
execute."),
+ "This property is deprecated, use tserver.scan.executors.meta.threads
instead."),
+ TSERV_SCAN_EXECUTORS_PREFIX("tserver.scan.executors.", null,
PropertyType.PREFIX,
+ "Prefix for defining executors to service scans. For each executor the
number of threads, "
Review comment:
The documentation here is nice but it would be help if a page was added to
the Accumulo user manual about scan executors. This page could:
* Describe motivation for scan executors
* Document default behavior for scan executors
* Document how scan executors can be used w/o using a custom scan dispactcher
* When/how to write custom scan dispatcher and prioritizer.
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