Bug 1568415 - prevent log record update which causes deletions
Summary: prevent log record update which causes deletions
Alias: None
Product: OpenShift Container Platform
Classification: Red Hat
Component: Logging
Version: 3.7.1
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
: 3.7.z
Assignee: Jeff Cantrill
QA Contact: Anping Li
Depends On: 1565909
TreeView+ depends on / blocked
Reported: 2018-04-17 13:07 UTC by Jeff Cantrill
Modified: 2018-05-18 03:55 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Cause: The default write operation for fluentd to elasticsearch is index Consequence: Writes can trigger unnecessary 'delete' operations for elasticsearch causing extra load that affects performance Fix: Utilize the 'create' operation Result: Writes to elasticsearch will only c
Clone Of: 1565909
Last Closed: 2018-05-18 03:54:45 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Github openshift origin-aggregated-logging pull 1086 0 None None None 2018-04-17 13:07:17 UTC
Red Hat Product Errata RHBA-2018:1576 0 None None None 2018-05-18 03:55:08 UTC

Description Jeff Cantrill 2018-04-17 13:07:17 UTC
+++ This bug was initially created as a clone of Bug #1565909 +++

Description of problem:
Now that we've switched to adding a unique id to each record, if we do retry, we update the document with that id.  So we don't get duplicates, but instead, we get a lot of deletions.  A document deletion is an expensive operation.

We must change https://github.com/openshift/origin-aggregated-logging/blob/master/fluentd/configs.d/openshift/output-es-config.conf and https://github.com/openshift/origin-aggregated-logging/blob/master/fluentd/configs.d/openshift/output-es-ops-config.conf to add the parameter `write_operation` to use `create` instead of the default `index`: https://github.com/uken/fluent-plugin-elasticsearch/blob/v0.12/lib/fluent/plugin/out_elasticsearch.rb#L42

We must also have a CI test that can verify
- no duplicates
- no deletions
when the es plugin has to retry.

Version-Release number of selected component (if applicable):
3.10 and backports

How reproducible:

Steps to Reproduce:

Actual results:

Expected results:

Additional info:

--- Additional comment from Peter Portante on 2018-04-10 23:43:00 EDT ---

See also https://www.elastic.co/guide/en/elasticsearch/reference/2.0/docs-bulk.html#docs-bulk, which describes in the behavior in the fourth paragraph:

   The possible actions are index, create, delete and update.
   "index" and "create" expect a source on the next line, and
   have the same semantics as the op_type parameter to the
   standard index API (i.e. "create" will fail if a document
   with the same index and type exists already, whereas index
   will add or replace a document as necessary).

--- Additional comment from Jeff Cantrill on 2018-04-11 12:33:10 EDT ---


Comment 2 Anping Li 2018-05-09 10:34:06 UTC
The fix is in openshift3/logging-fluentd/images/v3.7.46-1. No regression error found. so move bug verified.

Comment 5 errata-xmlrpc 2018-05-18 03:54:45 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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