Batch indexing into offline Solr shards

Batch indexing into offline Solr shards is mainly intended for offline use-cases by advanced users. Use cases requiring read-only indexes for searching can be handled by using batch indexing without the --go-live option. By not using GoLive, you can avoid copying datasets between segments, thereby reducing resource utilization.

Running the MapReduce job without GoLive causes the job to create a set of Solr index shards from a set of input files and write the indexes to HDFS. You can then explicitly point each Solr server to one of the HDFS output shard directories.

If you are working with a secured cluster, configure your client JAAS file ($HOME/jaas.conf) as follows:

Client {
 com.sun.security.auth.module.Krb5LoginModule required
 useKeyTab=false
 useTicketCache=true
 principal="solr@EXAMPLE.COM";
 };

If you are using Kerberos, kinit as the user that has privileges to update the collection:
```
kinit jdoe@EXAMPLE.COM
```
Replace EXAMPLE.COM with your Kerberos realm name.
Delete any existing documents in the cloudera_tutorial_tweets collection. If your cluster does not have security enabled, run the following commands as the solr user by adding sudo -u solr before the command:
```
solrctl collection --deletedocs cloudera_tutorial_tweets
```

Delete the contents of the outdir directory:

hdfs dfs -rm -r -skipTrash /user/jdoe/outdir/*

Run the MapReduce job as follows, replacing nn01.example.com in the command with your NameNode hostname.

Security enabled:

YARN_OPTS="-Djava.security.auth.login.config=/path/to/jaas.conf" yarn jar /opt/cloudera/parcels/CDH/lib/solr/contrib/mr/search-mr-*-job.jar org.apache.solr.hadoop.MapReduceIndexerTool -D 'mapred.child.java.opts=-Xmx500m' -D 'mapreduce.job.user.classpath.first=true' --log4j /opt/cloudera/parcels/CDH/share/doc/search*/examples/solr-nrt/log4j.properties --morphline-file /opt/cloudera/parcels/CDH/share/doc/search*/examples/solr-nrt/test-morphlines/tutorialReadAvroContainer.conf --output-dir hdfs://nn01.example.com:8020/user/jdoe/outdir --verbose --zk-host zk01.example.com:2181/solr --collection cloudera_tutorial_tweets --shards 2 hdfs://nn01.example.com:8020/user/jdoe/indir

Check the job status at:
```
http://rm01.example.com:8088/ui2/#/yarn-apps/apps
```
For secure clusters, replace http with https and port 8088 with 8090.
After the job is completed, check the generated index files. Individual shards are written to the results directory with names of the form part-00000, part-00001, part-00002, and so on. This example has two shards:
```
hdfs dfs -ls /user/jdoe/outdir/results
```
```
hdfs dfs -ls /user/jdoe/outdir/results/part-00000/data/index
```
In the Cloudera Manager web console for the cluster, stop the Solr service (Solr service > Actions > Stop).

Identify the paths to each Solr core:

hdfs dfs -ls /solr/cloudera_tutorial_tweets

Found 2 items
drwxr-xr-x   - solr solr          0 2017-03-13 06:20 /solr/cloudera_tutorial_tweets/core_node1
drwxr-xr-x   - solr solr          0 2017-03-13 06:20 /solr/cloudera_tutorial_tweets/core_node2

Move the index shards into place.
1. (Kerberos only) Switch to the solr user:
```
kinit solr@EXAMPLE.COM
```
2. Remove outdated files. If your cluster does not have security enabled, run the following commands as the solr user by adding sudo -u solr before the command:
```
hdfs dfs -rm -r -skipTrash /solr/cloudera_tutorial_tweets/core_node1/data/index
hdfs dfs -rm -r -skipTrash /solr/cloudera_tutorial_tweets/core_node1/data/tlog
hdfs dfs -rm -r -skipTrash /solr/cloudera_tutorial_tweets/core_node2/data/index
hdfs dfs -rm -r -skipTrash /solr/cloudera_tutorial_tweets/core_node2/data/tlog
```
3. Change ownership of the results directory to solr. If your cluster has security enabled, kinit as the HDFS superuser (hdfs by default) before running the following command. If your cluster does not have security enabled, run the command as the HDFS superuser by adding sudo -u hdfs before the command:
```
hdfs dfs -chown -R solr /user/jdoe/outdir/results
```
4. (Kerberos only) Switch to the solr user:
```
kinit solr@EXAMPLE.COM
```
5. Move the two index shards into place. If your cluster does not have security enabled, run the following commands as the solr user by adding sudo -u solr before the command:
```
hdfs dfs -mv /user/jdoe/outdir/results/part-00000/data/index /solr/cloudera_tutorial_tweets/core_node1/data
```
```
hdfs dfs -mv /user/jdoe/outdir/results/part-00001/data/index /solr/cloudera_tutorial_tweets/core_node2/data
```
In the Cloudera Manager web console for the cluster, start the Solr service (Solr service > Actions > Start).
Run some Solr queries. For example, for a Solr server running on search01.example.com, go to one of the following URLs in a browser, depending on whether you have enabled security on your cluster:
- Security enabled: https://search01.example.com:8985/solr/cloudera_tutorial_tweets/select?q=*:*
If indexing was successful, this page displays the first 10 query results.