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<p>This guide provides basic help for issues frequently encountered when deploying topologies.</p>
<h3><a class="anchor" aria-hidden="true" id="1-how-can-i-get-more-debugging-information"></a><a href="#1-how-can-i-get-more-debugging-information" 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>1. How can I get more debugging information?</h3>
<p>Enable the <code>--verbose</code> flag to see more debugging information, for example</p>
<pre><code class="hljs css language-bash">heron submit ... ExclamationTopology --verbose        
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="2-why-does-the-topology-launch-successfully-but-fail-to-start"></a><a href="#2-why-does-the-topology-launch-successfully-but-fail-to-start" 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>2. Why does the topology launch successfully but fail to start?</h3>
<p>Even if the topology is submitted successfully, it could still fail to
start some component. For example, TManager may fail to start due to unfulfilled
dependencies.</p>
<p>For example, the following message can appear:</p>
<pre><code class="hljs css language-bash">$ heron activate <span class="hljs-built_in">local</span> ExclamationTopology

...

[2016-05-27 12:02:38 -0600] org.apache.heron.common.basics.FileUtils SEVERE: \
Failed to <span class="hljs-built_in">read</span> from file.
java.nio.file.NoSuchFileException: \
/home//.herondata/repository/state/<span class="hljs-built_in">local</span>/pplans/ExclamationTopology

...

[2016-05-27 12:02:38 -0600] org.apache.heron.spi.utils.TManagerUtils SEVERE: \
Failed to get physical plan <span class="hljs-keyword">for</span> topology ExclamationTopology

...

ERROR: Failed to activate topology <span class="hljs-string">'ExclamationTopology'</span>
INFO: Elapsed time: 1.883s.
</code></pre>
<h4><a class="anchor" aria-hidden="true" id="what-to-do"></a><a href="#what-to-do" 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>What to do</h4>
<ul>
<li><p>This file will show if any specific components have failed to start.</p>
<pre><code class="hljs css language-bash">~/.herondata/topologies/{cluster}/{role}/{TopologyName}/heron-executor.stdout
</code></pre>
<p>For example, there may be errors when trying to spawn a Stream Manager process in the file:</p>
<pre><code class="hljs css language-bash">Running stmgr-1 process as ./heron-core/bin/heron-stmgr ExclamationTopology \
ExclamationTopology0a9c6550-7f3d-44fb-97ea-5c779fac6924 ExclamationTopology.defn LOCALMODE \
/Users/<span class="hljs-variable">${USERNAME}</span>/.herondata/repository/state/<span class="hljs-built_in">local</span> stmgr-1 \
container_1_word_2,container_1_exclaim1_1 58106 58110 58109 ./heron-conf/heron_internals.yaml
2016-06-09 16:20:28:  stdout:
2016-06-09 16:20:28:  stderr: error <span class="hljs-keyword">while</span> loading shared libraries: libunwind.so.8: \
cannot open shared object file: No such file or directory
</code></pre>
<p>Then fix it correspondingly.</p></li>
<li><p>It is also possible that the host has an issue with resolving localhost.
To check, run the following command in a shell.</p>
<pre><code class="hljs css language-bash">$ python -c <span class="hljs-string">"import socket; print socket.gethostbyname(socket.gethostname())"</span>
Traceback (most recent call last):
  File <span class="hljs-string">"&lt;string&gt;"</span>, line 1, <span class="hljs-keyword">in</span> &lt;module&gt;
socket.gaierror: [Errno 8] nodename nor servname provided, or not known
</code></pre>
<p>If the output looks like a normal IP address, such as <code>127.0.0.1</code>,
you don't have this issue.
If the output is similar to the above, you need to modify the <code>/etc/hosts</code>
file to correctly resolve localhost, as shown below.</p>
<ol>
<li><p>Run the following command, whose output is your computer's hostname.</p>
<pre><code class="hljs css language-bash">$ python -c <span class="hljs-string">"import socket; print socket.gethostname()"</span>
</code></pre></li>
<li><p>Open the <code>/etc/hosts</code> file as superuser and find a line containing</p>
<pre><code class="hljs css language-bash">127.0.0.1   localhost
</code></pre></li>
<li><p>Append your hostname after the word &quot;localhost&quot; on the line.
For example, if your hostname was <code>tw-heron</code>, then the line should
look like the following:</p>
<pre><code class="hljs css language-bash">127.0.0.1   localhost   tw-heron
</code></pre></li>
<li><p>Save the file. The change should usually be reflected immediately,
although rebooting might be necessary depending on your platform.</p></li>
</ol></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="3-why-does-the-process-fail-during-runtime"></a><a href="#3-why-does-the-process-fail-during-runtime" 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>3. Why does the process fail during runtime?</h3>
<p>If a component (e.g., TManager or Stream Manager) has failed during runtime, visit the component's logs in</p>
<pre><code class="hljs css language-bash">~/.herondata/topologies/{cluster}/{role}/{TopologyName}/<span class="hljs-built_in">log</span>-files/
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="4-how-to-force-kill-and-clean-up-a-topology"></a><a href="#4-how-to-force-kill-and-clean-up-a-topology" 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>4. How to force kill and clean up a topology?</h3>
<p>In general, it suffices to run:</p>
<pre><code class="hljs css language-bash">heron <span class="hljs-built_in">kill</span> ...
</code></pre>
<p>If returned error, the topology can still be killed by running
<code>kill pid</code> to kill all associated running process and <code>rm -rf ~/.herondata/</code>
to clean up the state.</p>
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