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Posted to oak-commits@jackrabbit.apache.org by ch...@apache.org on 2017/03/20 12:49:24 UTC
svn commit: r1787756 - in
/jackrabbit/oak/trunk/oak-doc/src/site/markdown/query:
async-index-config.png indexing.md
Author: chetanm
Date: Mon Mar 20 12:49:24 2017
New Revision: 1787756
URL: http://svn.apache.org/viewvc?rev=1787756&view=rev
Log:
OAK-5946 - Document indexing flow
OAK-4414 - Document IndexStatsMBean features
Add details around
-- Indexer OSGi config
-- IndexStatsMBean
Added:
jackrabbit/oak/trunk/oak-doc/src/site/markdown/query/async-index-config.png (with props)
Modified:
jackrabbit/oak/trunk/oak-doc/src/site/markdown/query/indexing.md
Added: jackrabbit/oak/trunk/oak-doc/src/site/markdown/query/async-index-config.png
URL: http://svn.apache.org/viewvc/jackrabbit/oak/trunk/oak-doc/src/site/markdown/query/async-index-config.png?rev=1787756&view=auto
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Modified: jackrabbit/oak/trunk/oak-doc/src/site/markdown/query/indexing.md
URL: http://svn.apache.org/viewvc/jackrabbit/oak/trunk/oak-doc/src/site/markdown/query/indexing.md?rev=1787756&r1=1787755&r2=1787756&view=diff
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--- jackrabbit/oak/trunk/oak-doc/src/site/markdown/query/indexing.md (original)
+++ jackrabbit/oak/trunk/oak-doc/src/site/markdown/query/indexing.md Mon Mar 20 12:49:24 2017
@@ -99,6 +99,10 @@ certain interval. At time of execution t
(e.g. lucene) or in any remote store (e.g. solr)
6. `AsyncIndexUpdate` would then update the last indexed checkpoint to current checkpoint and do a commit.
+Such async indexes are _eventually consistent_ with the repository state and lag behind the latest repository state
+by some time. However the index content would be eventually consistent and never end up in wrong state with respect
+to repository state.
+
#### <a name="checkpoint"></a> Checkpoint
Checkpoint is a mechanism whereby a client of NodeStore can request it to ensure that repository state at that time
@@ -157,14 +161,51 @@ non clustered setup like those based on
#### <a name="async-index-lag"></a> Indexing Lag
+Async indexing jobs are by default configured to run at interval of 5 secs. Depending on the system load and diff size
+of content to be indexed the indexing may start lagging by longer time intervals. Due to this the indexing results would
+lag behind the repository state and may become stale i.e. new content added would show up in result after some time.
+
+`IndexStats` MBean keeps a time series and metrics stats for the indexing frequency. This can be used to track the
+indexing state
+
+[NRT Indexing](#nrt-indexing) introduced in Oak 1.6 would help in such situations and can keep the results more upto
+date
+
#### <a name="async-index-setup"></a> Setup
`Since 1.6`
+Async indexers can be configure via OSGi config for `org.apache.jackrabbit.oak.plugins.index.AsyncIndexerService`
+
+
+
+Different lanes can be configured by adding more rows of _Async Indexer Configs_
+
+#### <a name="async-index-mbean"></a> Async Indexing MBean
+
+For each configured async indexer in the setup the indexer exposes a `IndexStatsMBean` which provides various
+stats around current indexing state.
+
+ org.apache.jackrabbit.oak: async (IndexStats)
+ org.apache.jackrabbit.oak: fulltext-async (IndexStats)
+
+It provide details like
+
+* FailingIndexStats - Stats around indexes which are [failing and marked as corrupt](#corrupt-index-handling)
+* LastIndexedTime - Time upto which repository state has been indexed
+* Status - running, done, failing etc
+* Failing - boolean flag indicating that indexing has been failing due to some issue. This can be monitored
+ for detecting if indexer is healthy or not
+* ExecutionCount - Time series data around when number of execution for various time intervals
+Further it provides operations like
+* pause - Pauses the indexer
+* abortAndPause - Aborts any running indexing cycle and pauses the indexer. Invoke 'resume' once you are ready
+ to resume indexing again
+* resume - Resume the indexing
-#### <a name="async-index-mbean"></a> Clustered Setup
+#### <a name="corrupt-index-handling"></a> Isolating Corrupt Indexes
## <a name="nrt-indexing"></a> Near Real Time Indexing