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<p>Heron can use the local file system as a state manager for storing various book
keeping information. Use of local file system is recommended mainly for single
node server and laptop. This configuration is ideal for deploying in edge devices.
Heron developers can use this setting for developing and debugging various heron
components in their laptop or server.</p>
<h3><a class="anchor" aria-hidden="true" id="local-file-system-state-manager-configuration"></a><a href="#local-file-system-state-manager-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Local File System State Manager Configuration</h3>
<p>You can make Heron aware of the ZooKeeper cluster by modifying the
<code>statemgr.yaml</code> config file specific for the Heron cluster. You'll
need to specify the following for each cluster:</p>
<ul>
<li><p><code>heron.class.state.manager</code> --- Indicates the class to be loaded for local file system
state manager. You should set this to <code>org.apache.heron.statemgr.localfs.LocalFileSystemStateManager</code></p></li>
<li><p><code>heron.statemgr.connection.string</code> --- This should be <code>LOCALMODE</code> since it always localhost.</p></li>
<li><p><code>heron.statemgr.root.path</code> --- The root path in the local file system where state information
is stored.  We recommend providing Heron with an exclusive directory; if you do not, make sure that
the following sub-directories are unused: <code>/tmanagers</code>, <code>/topologies</code>, <code>/pplans</code>, <code>/executionstate</code>,
<code>/schedulers</code>.</p></li>
<li><p><code>heron.statemgr.localfs.is.initialize.file.tree</code> --- Indicates whether the nodes under root
<code>/tmanagers</code>, <code>/topologies</code>, <code>/pplans</code>, <code>/executionstate</code>, and <code>/schedulers</code> need to created, if they
are not found. Set it to <code>True</code>, if you could like Heron to create those directories. If those
directories are already there, set it to <code>False</code>. The absence of this configuration implies <code>True</code>.</p></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="example-local-file-system-state-manager-configuration"></a><a href="#example-local-file-system-state-manager-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example Local File System State Manager Configuration</h3>
<p>Below is an example configuration (in <code>statemgr.yaml</code>) for a local file system running in <code>localhost</code>:</p>
<pre><code class="hljs css language-yaml"><span class="hljs-comment"># local state manager class for managing state in a persistent fashion</span>
<span class="hljs-attr">heron.class.state.manager:</span> <span class="hljs-string">org.apache.heron.statemgr.localfs.LocalFileSystemStateManager</span>

<span class="hljs-comment"># local state manager connection string</span>
<span class="hljs-attr">heron.statemgr.connection.string:</span> <span class="hljs-string">LOCALMODE</span>

<span class="hljs-comment"># path of the root address to store the state in a local file system</span>
<span class="hljs-attr">heron.statemgr.root.path:</span> <span class="hljs-string">${HOME}/.herondata/repository/state/${CLUSTER}</span>

<span class="hljs-comment"># create the sub directories, if needed</span>
<span class="hljs-attr">heron.statemgr.localfs.is.initialize.file.tree:</span> <span class="hljs-literal">True</span>
</code></pre>
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