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https://issues.apache.org/jira/browse/ACCUMULO-4458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15491815#comment-15491815
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Josh Elser commented on ACCUMULO-4458:
--------------------------------------
{code}
+ /**
+ * Properties we check the value of within the TabletServer request handling
or maintenance processing loops.
+ */
+ public static final EnumSet<Property> HOT_PATH_PROPERTIES =
EnumSet.of(Property.TSERV_CLIENT_TIMEOUT,
Property.TSERV_TOTAL_MUTATION_QUEUE_MAX,
+ Property.TSERV_ARCHIVE_WALOGS, Property.GC_TRASH_IGNORE,
Property.TSERV_MAJC_DELAY, Property.TABLE_MINC_LOGS_MAX,
Property.TSERV_MAJC_MAXCONCURRENT,
+ Property.REPLICATION_WORKER_THREADS, Property.TABLE_DURABILITY,
Property.INSTANCE_ZK_TIMEOUT, Property.TABLE_CLASSPATH);
+
{code}
It seems like it would be more simple if we just extracted all Accumulo
properties (instead of this reduced list). Is there a big impact on memory for
this? What about if we remove any that are still the default value (and let
them be represented by the DefaultConfiguration)? My initial concern would be
that we miss some, or add new "hot" properties, and we sign up to having to
maintain this list.
> lock contention around configuration settings impacts tablet server
> performance
> -------------------------------------------------------------------------------
>
> Key: ACCUMULO-4458
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4458
> Project: Accumulo
> Issue Type: Bug
> Components: tserver
> Affects Versions: 1.7.1, 1.8.0
> Reporter: Sean Busbey
> Assignee: Sean Busbey
> Priority: Critical
> Fix For: 1.7.3, 1.8.1, 2.0.0
>
> Attachments: ACCUMULO-4458-1.7.v1.patch
>
>
> While investigating a pretty severe performance regression comparing YCSB
> against 1.6 and 1.7, I found a fair bit of lock contention around getting
> configuration values. This was improved by ACCUMULO-4388, but various threads
> eventually all started contending on the configuration values expected from
> the site xml files.
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