mjsax commented on a change in pull request #10046:
URL: https://github.com/apache/kafka/pull/10046#discussion_r570683354
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File path: docs/streams/developer-guide/memory-mgmt.html
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@@ -168,7 +168,15 @@
<h2><a class="toc-backref" href="#id3">RocksDB</a><a class="headerlink"
href="#rocksdb" title="Permalink to this headline"></a></h2>
<p> Each instance of RocksDB allocates off-heap memory for a block
cache, index and filter blocks, and memtable (write buffer). Critical configs
(for RocksDB version 4.1.0) include
<code class="docutils literal"><span
class="pre">block_cache_size</span></code>, <code class="docutils
literal"><span class="pre">write_buffer_size</span></code> and <code
class="docutils literal"><span
class="pre">max_write_buffer_number</span></code>. These can be specified
through the
- <code class="docutils literal"><span
class="pre">rocksdb.config.setter</span></code> configuration.</li>
+ <code class="docutils literal"><span
class="pre">rocksdb.config.setter</span></code> configuration.</p>
+ <p>Also, we recommend changing RocksDB's default memory allocator,
because the default allocator may lead to increased memory consumption.
+ To change the memory allocator to <code>jemalloc</code>, you need to
set the an environment variable before you start your Kafka Streams
application:</p>
+ <pre>
+# example: install jemalloc (on Debian)
+$ apt install -y libjemalloc-dev
+# set LD_PRELOAD before you start your Kafka Streams application
+$ LD_PRELOAD="/usr/lib/x86_64-linux-gnu/libjemalloc.so”
Review comment:
Good catch!
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