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README.rst
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README.rst
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===============================
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===============
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elastic-recheck
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===============================
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===============
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"Use ElasticSearch to classify OpenStack gate failures"
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@ -8,27 +8,28 @@ elastic-recheck
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Idea
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----
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Identifying the specific bug that is causing a transient error in the gate
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is very hard. Just identifying which tempest test failed is not enough
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because a single bug can potentially cause multiple tempest tests to fail.
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If we can find a fingerprint for a specific bug using logs, then we can use
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ElasticSearch to automatically detect any occurrences of the bug.
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Identifying the specific bug that is causing a transient error in the gate is
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difficult. Just identifying which tempest test failed is not enough because a
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single tempest test can fail due to any number of underlying bugs. If we can
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find a fingerprint for a specific bug using logs, then we can use ElasticSearch
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to automatically detect any occurrences of the bug.
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Using these fingerprints elastic-recheck can:
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* Search ElasticSearch for all occurrences of a bug.
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* Identify bug trends such as: when it started, is the bug fixed, is it
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getting worse, etc.
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* Identify bug trends such as: when it started, is the bug fixed, is it getting
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worse, etc.
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* Classify bug failures in real time and report back to gerrit if we find a
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match, so a patch author knows why the test failed.
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queries/
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--------
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All queries are stored in separate yaml files in a queries directory
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at the top of the elastic-recheck code base. The format of these files
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is ######.yaml (where ###### is the launchpad bug number), the yaml should have
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a ``query`` keyword which is the query text for elastic search.
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All queries are stored in separate yaml files in a queries directory at the top
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of the elastic-recheck code base. The format of these files is ######.yaml
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(where ###### is the launchpad bug number), the yaml should have a ``query``
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keyword which is the query text for elastic search.
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Guidelines for good queries:
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@ -36,60 +37,60 @@ Guidelines for good queries:
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filename query is typically better than a console one, as that's matching a
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deep failure versus a surface symptom.
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- Queries should not return any hits for successful jobs, this is a
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sign the query isn't specific enough. A rule of thumb is > 10% success hits
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probably means this isn't good enough.
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- Queries should not return any hits for successful jobs, this is a sign the
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query isn't specific enough. A rule of thumb is > 10% success hits probably
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means this isn't good enough.
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- If it's impossible to build a query to target a bug, consider patching the
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upstream program to be explicit when it fails in a particular way.
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- Use the 'tags' field rather than the 'filename' field for filtering. This is
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primarily because of grenade jobs where the same log file shows up in the
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'old' and 'new' side of the grenade job. For example, tags:"screen-n-cpu.txt"
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will query in logs/old/screen-n-cpu.txt and logs/new/screen-n-cpu.txt. The
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tags:"console" filter is also used to query in console.html as well as
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tempest and devstack logs.
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'old' and 'new' side of the grenade job. For example,
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``tags:"screen-n-cpu.txt"`` will query in ``logs/old/screen-n-cpu.txt`` and
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``logs/new/screen-n-cpu.txt``. The ``tags:"console"`` filter is also used to
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query in ``console.html`` as well as tempest and devstack logs.
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- Avoid the use of wildcards in queries since they can put an undue burden on
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the query engine. A common case where wildcards are used and shouldn't be are
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in querying against a specific set of build_name fields,
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e.g. gate-nova-python26 and gate-nova-python27.
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Rather than use build_name:gate-nova-python*, list the jobs with an OR, e.g.:
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::
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in querying against a specific set of ``build_name`` fields, e.g.
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``gate-nova-python26`` and ``gate-nova-python27``. Rather than use
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``build_name:gate-nova-python*``, list the jobs with an ``OR``. For example::
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(build_name:"gate-nova-python26" OR build_name:"gate-nova-python27")
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In order to support rapidly added queries, it's considered socially
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acceptable to +A changes that only add 1 new bug query, and to even
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self approve those changes by core reviewers.
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In order to support rapidly added queries, it's considered socially acceptable
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to approve changes that only add 1 new bug query, and to even self approve
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those changes by core reviewers.
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Adding Bug Signatures
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---------------------
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Most transient bugs seen in gate are not bugs in tempest associated
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with a specific tempest test failure, but rather some sort of issue
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further down the stack that can cause many tempest tests to fail.
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Most transient bugs seen in gate are not bugs in tempest associated with a
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specific tempest test failure, but rather some sort of issue further down the
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stack that can cause many tempest tests to fail.
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#. Given a transient bug that is seen during the gate, go through the
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logs (logs.openstack.org) and try to find a log that is associated
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with the failure. The closer to the root cause the better.
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#. Given a transient bug that is seen during the gate, go through `the logs
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<http://logs.openstack.org/>`_ and try to find a log that is associated with
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the failure. The closer to the root cause the better.
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Note that queries can only be written against INFO level and higher log
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messages. This is by design to not overwhelm the search cluster.
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#. Go to logstash.openstack.org and create an elastic search query to
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find the log message from step 1. To see the possible fields to
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search on click on an entry. Lucene query syntax is available at
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http://lucene.apache.org/core/4_0_0/queryparser/org/apache/lucene/queryparser/classic/package-summary.html#package_description
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#. Go to `logstash.openstack.org <http://logstash.openstack.org/>`_ and create
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an elastic search query to find the log message from step 1. To see the
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possible fields to search on click on an entry. Lucene query syntax is
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available at `lucene.apache.org
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<http://lucene.apache.org/core/4_0_0/queryparser/org/apache/lucene/queryparser/classic/package-summary.html#package_description>`_.
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#. Add a comment to the bug with the query you identified and a link to
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the logstash url for that query search.
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#. Add the query to ``elastic-recheck/queries/BUGNUMBER.yaml`` and push
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the patch up for review.
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https://git.openstack.org/cgit/openstack-infra/elastic-recheck/tree/queries
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#. Tag your commit with a ``Related-Bug`` tag in the footer, or add a comment
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to the bug with the query you identified and a link to the logstash URL for
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that query search.
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#. Add the query to ``elastic-recheck/queries/BUGNUMBER.yaml``
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(All queries can be found on `git.openstack.org
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<https://git.openstack.org/cgit/openstack-infra/elastic-recheck/tree/queries>`_)
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and push the patch up for review.
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Future Work
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------------
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