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new 7da33815 Automatic Site Publish by Buildbot
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commit 7da33815fa36a7a1a71798806548c5e6c019af36
Author: buildbot <[email protected]>
AuthorDate: Wed Jun 15 15:01:35 2022 +0000
Automatic Site Publish by Buildbot
---
output/docs/2.x/administration/caching.html | 3 +++
output/docs/2.x/administration/scan-executors.html | 12 ++++++++++++
output/docs/2.x/getting-started/features.html | 6 ++++++
output/feed.xml | 4 ++--
output/search_data.json | 6 +++---
5 files changed, 26 insertions(+), 5 deletions(-)
diff --git a/output/docs/2.x/administration/caching.html
b/output/docs/2.x/administration/caching.html
index 77a4d344..ee3053b1 100644
--- a/output/docs/2.x/administration/caching.html
+++ b/output/docs/2.x/administration/caching.html
@@ -442,6 +442,9 @@ for tables where read performance is critical.</p>
<h2 id="configuration">Configuration</h2>
+<p>The <a
href="/docs/2.x/configuration/server-properties#tserver_cache_manager_class">tserver.cache.manager.class</a>
property controls which block cache implementation is used within the tablet
server. Users
+can supply their own implementation and set custom configuration properties to
control it’s behavior (see
org.apache.accumulo.core.spi.cache.BlockCacheManager$Configuration.java).</p>
+
<p>The index and data block caches are configured for tables by the following
properties:</p>
<ul>
diff --git a/output/docs/2.x/administration/scan-executors.html
b/output/docs/2.x/administration/scan-executors.html
index 7922615d..35f36a19 100644
--- a/output/docs/2.x/administration/scan-executors.html
+++ b/output/docs/2.x/administration/scan-executors.html
@@ -573,6 +573,18 @@ priority of 1.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre
class="highlight"><code>scan -t tex --execution-hints scan_type=alpha
</code></pre></div></div>
+<p>Execution Hints can also be used to influence how the block caches are used
for
+a scan. The following configuration would modify the <code
class="language-plaintext highlighter-rouge">gamma</code> executor to use blocks
+in the cache if they are already cached, but would never load mising blocks
into the
+cache.</p>
+
+<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre
class="highlight"><code>config -t tex -s
table.scan.dispatcher.opts.cacheUsage.gamma=opportunistic
+</code></pre></div></div>
+
+<p>Other valid values are <code class="language-plaintext
highlighter-rouge">disabled</code> which does not use data in the block caches,
+<code class="language-plaintext highlighter-rouge">enabled</code> which uses
the block cache as it normally would and <code class="language-plaintext
highlighter-rouge">table</code> which enables
+the block cache for the scan if it’s enabled on the table.</p>
+
<div class="row" style="margin-top: 20px;">
diff --git a/output/docs/2.x/getting-started/features.html
b/output/docs/2.x/getting-started/features.html
index d7126aa1..dad6f37a 100644
--- a/output/docs/2.x/getting-started/features.html
+++ b/output/docs/2.x/getting-started/features.html
@@ -726,6 +726,12 @@ it is very unlikely that more data will be written to it,
and thus paying the pe
to re-write a large file can be avoided. Implementations of this compaction
strategy
can be used to optimize the data that compactions will write.</p>
+<h3 id="pluggable-block-caches">Pluggable Block Caches</h3>
+
+<p>Accumulo provides two BlockCacheManager implementations
(LruBlockCacheManager and
+TinyLfuBlockCacheManager) that construct on-heap block caches. Users can
provide
+alternate BlockCacheManager implementations using the property <code
class="language-plaintext
highlighter-rouge">tserver.cache.manager.class</code>.</p>
+
<h2 id="general-administration">General Administration</h2>
<h3 id="monitor-page">Monitor page</h3>
diff --git a/output/feed.xml b/output/feed.xml
index 8652c881..31cf3087 100644
--- a/output/feed.xml
+++ b/output/feed.xml
@@ -6,8 +6,8 @@
</description>
<link>https://accumulo.apache.org/</link>
<atom:link href="https://accumulo.apache.org/feed.xml"; rel="self"
type="application/rss+xml"/>
- <pubDate>Sat, 28 May 2022 15:05:48 +0000</pubDate>
- <lastBuildDate>Sat, 28 May 2022 15:05:48 +0000</lastBuildDate>
+ <pubDate>Wed, 15 Jun 2022 15:01:27 +0000</pubDate>
+ <lastBuildDate>Wed, 15 Jun 2022 15:01:27 +0000</lastBuildDate>
<generator>Jekyll v4.2.0</generator>
diff --git a/output/search_data.json b/output/search_data.json
index 64e16545..43c1dc9d 100644
--- a/output/search_data.json
+++ b/output/search_data.json
@@ -2,7 +2,7 @@
"docs-2-x-administration-caching": {
"title": "Caching",
- "content" : "Accumulo tablet servers have block caches that
buffer data in memory to limit reads from disk.This caching has the following
benefits: reduces latency when reading data helps alleviate hotspots in
tablesEach tablet server has an index and data block cache that is shared by
all hosted tablets (see the tablet server diagramto learn more). A typical
Accumulo read operation will perform a binary search over several index blocks
followed by a linear scanof one or more da [...]
+ "content" : "Accumulo tablet servers have block caches that
buffer data in memory to limit reads from disk.This caching has the following
benefits: reduces latency when reading data helps alleviate hotspots in
tablesEach tablet server has an index and data block cache that is shared by
all hosted tablets (see the tablet server diagramto learn more). A typical
Accumulo read operation will perform a binary search over several index blocks
followed by a linear scanof one or more da [...]
"url": " /docs/2.x/administration/caching",
"categories": "administration"
},
@@ -51,7 +51,7 @@
"docs-2-x-administration-scan-executors": {
"title": "Scan Executors",
- "content" : "Accumulo scans operate by repeatedly fetching
batches of data from a tabletserver. On the tablet server side, a thread pool
fetches batches.In Java threads pools are called executors. By default, a
single executor pertablet server handles all scans in FIFO order. For some
workloads, the singleFIFO executor is suboptimal. For example, consider many
unimportant scansreading lots of data mixed with a few important scans reading
small amounts ofdata. The long scans n [...]
+ "content" : "Accumulo scans operate by repeatedly fetching
batches of data from a tabletserver. On the tablet server side, a thread pool
fetches batches.In Java threads pools are called executors. By default, a
single executor pertablet server handles all scans in FIFO order. For some
workloads, the singleFIFO executor is suboptimal. For example, consider many
unimportant scansreading lots of data mixed with a few important scans reading
small amounts ofdata. The long scans n [...]
"url": " /docs/2.x/administration/scan-executors",
"categories": "administration"
},
@@ -163,7 +163,7 @@
"docs-2-x-getting-started-features": {
"title": "Features",
- "content" : " Table Design and Configuration
Integrity/Availability Performance Testing Client API Extensible Behaviors
General Administration Internal Data Management On-demand Data
ManagementTable Design and ConfigurationIteratorsIterators are server-side
programming mechanisms that encode functions such as filtering andaggregation
within the data management steps (scopes where data is read from orwritten to
disk) that happen in the tablet server.Security labelsAccumulo [...]
+ "content" : " Table Design and Configuration
Integrity/Availability Performance Testing Client API Extensible Behaviors
General Administration Internal Data Management On-demand Data
ManagementTable Design and ConfigurationIteratorsIterators are server-side
programming mechanisms that encode functions such as filtering andaggregation
within the data management steps (scopes where data is read from orwritten to
disk) that happen in the tablet server.Security labelsAccumulo [...]
"url": " /docs/2.x/getting-started/features",
"categories": "getting-started"
},
