This is the documentation for CDH 5.1.0.
Documentation for other versions is available at Cloudera Documentation.

HBaseMapReduceIndexerTool

HBaseMapReduceIndexerTool is a MapReduce batch job driver that takes input data from an HBase table and creates Solr index shards and writes the indexes into HDFS, in a flexible, scalable, and fault-tolerant manner. It also supports merging the output shards into a set of live customer-facing Solr servers in SolrCloud.

More details are available through the command line help:
$ hadoop jar /usr/lib/hbase-solr/tools/hbase-indexer-mr-*-job.jar --help

usage: hadoop [GenericOptions]... jar hbase-indexer-mr-*-job.jar
       [--hbase-indexer-zk STRING] [--hbase-indexer-name STRING]
       [--hbase-indexer-file FILE] [--hbase-table-name STRING]
       [--hbase-start-row BINARYSTRING] [--hbase-end-row BINARYSTRING]
       [--hbase-start-time STRING] [--hbase-end-time STRING]
       [--hbase-timestamp-format STRING] [--zk-host STRING] [--go-live]
       [--collection STRING] [--go-live-threads INTEGER] [--help]
       [--output-dir HDFS_URI] [--overwrite-output-dir]
       [--morphline-file FILE] [--morphline-id STRING]
       [--update-conflict-resolver FQCN] [--reducers INTEGER]
       [--max-segments INTEGER] [--fair-scheduler-pool STRING] [--dry-run]
       [--log4j FILE] [--verbose] [--show-non-solr-cloud]

MapReduce batch job driver that takes  input  data  from an HBase table and
creates Solr index shards and writes the  indexes into HDFS, in a flexible,
scalable, and fault-tolerant manner.  It  also  supports merging the output
shards into a  set  of  live  customer-facing  Solr  servers  in SolrCloud.
Optionally, documents  can  be  sent  directly  from  the  mapper  tasks to
SolrCloud, which is a  much  less  scalable  approach  but enables updating
existing documents in SolrCloud. The  program  proceeds  in one or multiple
consecutive MapReduce-based phases, as follows:

1) Mapper phase: This (parallel)  phase  scans  over the input HBase table,
extracts the relevant content,  and  transforms it into SolrInputDocuments.
If run as a mapper-only job,  this phase also writes the SolrInputDocuments
directly to a live  SolrCloud  cluster.  The  conversion from HBase records
into Solr documents  is  performed  via  a  hbase-indexer configuration and
typically based on a morphline.

2)   Reducer   phase:   This   (parallel)    phase   loads   the   mapper's
SolrInputDocuments into  one  EmbeddedSolrServer  per  reducer.  Each  such
reducer and Solr server can be  seen  as  a (micro) shard. The Solr servers
store their data in HDFS.

3) Mapper-only  merge  phase:  This  (parallel)  phase  merges  the  set of
reducer shards into the number of  Solr  shards expected by the user, using
a mapper-only job.  This  phase  is  omitted  if  the  number  of shards is
already equal to the number of shards expected by the user

4) Go-live phase: This optional  (parallel)  phase merges the output shards
of the previous phase into a  set  of  live customer-facing Solr servers in
SolrCloud. If this phase  is  omitted  you  can  expecitly  point each Solr
server to one of the HDFS output shard directories

Fault Tolerance: Mapper and reducer  task  attempts  are retried on failure
per the standard MapReduce semantics. On program startup all data in the --
output-dir is deleted  if  that  output  directory  already  exists  and --
overwrite-output-dir is specified. This means  that  if the whole job fails
you can  retry  simply  by  rerunning  the  program  again  using  the same
arguments.

HBase Indexer parameters:
  Parameters for specifying the  HBase  indexer  definition and/or where it
  should be loaded from.

  --hbase-indexer-zk STRING
                         The address of the  ZooKeeper  ensemble from which
                         to fetch  the  indexer  definition  named --hbase-
                         indexer-name.  Format   is:   a   list   of  comma
                         separated host:port pairs,  each  corresponding to
                         a zk  server.  Example: '127.0.0.1:2181,127.0.0.1:
                         2182,127.0.0.1:2183'
  --hbase-indexer-name STRING
                         The name of  the  indexer  configuration  to fetch
                         from the  ZooKeeper  ensemble  specified  with  --
                         hbase-indexer-zk. Example: myIndexer
  --hbase-indexer-file FILE
                         Relative  or  absolute  path   to  a  local  HBase
                         indexer XML configuration file.  If supplied, this
                         overrides --hbase-indexer-zk  and --hbase-indexer-
                         name. Example: /path/to/morphline-hbase-mapper.xml

HBase scan parameters:
  Parameters for specifying what data is included while reading from HBase.

  --hbase-table-name STRING
                         Optional name of  the  HBase  table containing the
                         records  to   be   indexed.   If   supplied,  this
                         overrides the  value  from  the  --hbase-indexer-*
                         options. Example: myTable
  --hbase-start-row BINARYSTRING
                         Binary string  representation  of  start  row from
                         which to start  indexing  (inclusive).  The format
                         of the supplied row  key  should use two-digit hex
                         values prefixed by \x for non-ascii characters (e.
                         g. 'row\x00'). The semantics  of this argument are
                         the same as those  for  the HBase Scan#setStartRow
                         method. The default is  to  include  the first row
                         of the table. Example: AAAA
  --hbase-end-row BINARYSTRING
                         Binary string representation of  end row prefix at
                         which  to  stop  indexing   (exclusive).  See  the
                         description   of   --hbase-start-row    for   more
                         information. The default  is  to  include the last
                         row of the table. Example: CCCC
  --hbase-start-time STRING
                         Earliest timestamp (inclusive)  in  time  range of
                         HBase cells  to  be  included  for  indexing.  The
                         default is to include all cells. Example: 0
  --hbase-end-time STRING
                         Latest timestamp (exclusive) of  HBase cells to be
                         included for indexing. The  default  is to include
                         all cells. Example: 123456789
  --hbase-timestamp-format STRING
                         Timestamp format to be  used to interpret --hbase-
                         start-time and --hbase-end-time.  This  is a java.
                         text.SimpleDateFormat compliant format  (see http:
                         //docs.oracle.
                         com/javase/6/docs/api/java/text/SimpleDateFormat.
                         html). If  this  parameter  is  omitted  then  the
                         timestamps   are   interpreted    as   number   of
                         milliseconds  since  the   standard   epoch  (Unix
                         time). Example: yyyy-MM-dd'T'HH:mm:ss.SSSZ

Solr cluster arguments:
  Arguments that provide information about your Solr cluster. 

  --zk-host STRING       The address of a ZooKeeper  ensemble being used by
                         a SolrCloud cluster. This  ZooKeeper ensemble will
                         be examined  to  determine  the  number  of output
                         shards to create  as  well  as  the  Solr  URLs to
                         merge the output shards into  when using the --go-
                         live option. Requires that  you  also  pass the --
                         collection to merge the shards into.
                         
                         The   --zk-host   option   implements   the   same
                         partitioning semantics as  the  standard SolrCloud
                         Near-Real-Time (NRT)  API.  This  enables  to  mix
                         batch  updates  from   MapReduce   ingestion  with
                         updates from standard  Solr  NRT  ingestion on the
                         same SolrCloud  cluster,  using  identical  unique
                         document keys.
                         
                         Format is: a  list  of  comma  separated host:port
                         pairs,  each  corresponding   to   a   zk  server.
                         Example: '127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:
                         2183' If the optional  chroot  suffix  is used the
                         example  would  look  like:  '127.0.0.1:2181/solr,
                         127.0.0.1:2182/solr,127.0.0.1:2183/solr'     where
                         the client would  be  rooted  at  '/solr'  and all
                         paths would  be  relative  to  this  root  -  i.e.
                         getting/setting/etc... '/foo/bar' would  result in
                         operations being run on  '/solr/foo/bar' (from the
                         server perspective).
                         

Go live arguments:
  Arguments for  merging  the  shards  that  are  built  into  a  live Solr
  cluster. Also see the Cluster arguments.

  --go-live              Allows you to  optionally  merge  the  final index
                         shards into a  live  Solr  cluster  after they are
                         built. You can pass the  ZooKeeper address with --
                         zk-host and the relevant  cluster information will
                         be auto detected.  (default: false)
  --collection STRING    The SolrCloud  collection  to  merge  shards  into
                         when  using  --go-live   and  --zk-host.  Example:
                         collection1
  --go-live-threads INTEGER
                         Tuning knob that indicates  the  maximum number of
                         live merges  to  run  in  parallel  at  one  time.
                         (default: 1000)

Optional arguments:
  --help, -help, -h      Show this help message and exit
  --output-dir HDFS_URI  HDFS directory to  write  Solr  indexes to. Inside
                         there one  output  directory  per  shard  will  be
                         generated.    Example:     hdfs://c2202.mycompany.
                         com/user/$USER/test
  --overwrite-output-dir
                         Overwrite the directory  specified by --output-dir
                         if it already  exists.  Using  this parameter will
                         result in the  output  directory being recursively
                         deleted at job startup. (default: false)
  --morphline-file FILE  Relative or absolute path  to  a local config file
                         that contains one  or  more  morphlines.  The file
                         must be UTF-8 encoded.  The  file will be uploaded
                         to each MR task.  If  supplied, this overrides the
                         value   from   the    --hbase-indexer-*   options.
                         Example: /path/to/morphlines.conf
  --morphline-id STRING  The identifier  of  the  morphline  that  shall be
                         executed within the  morphline  config  file, e.g.
                         specified by --morphline-file. If the --morphline-
                         id option is  ommitted  the  first (i.e. top-most)
                         morphline within  the  config  file  is  used.  If
                         supplied, this overrides  the  value  from  the --
                         hbase-indexer-* options. Example: morphline1 
  --update-conflict-resolver FQCN
                         Fully qualified class name  of  a  Java class that
                         implements the  UpdateConflictResolver  interface.
                         This  enables  deduplication  and  ordering  of  a
                         series of document  updates  for  the  same unique
                         document key. For example,  a  MapReduce batch job
                         might index multiple files  in  the same job where
                         some of the files contain  old and new versions of
                         the very  same  document,  using  the  same unique
                         document key.
                         Typically,  implementations   of   this  interface
                         forbid collisions  by  throwing  an  exception, or
                         ignore all but the  most  recent document version,
                         or, in the general  case,  order colliding updates
                         ascending  from  least   recent   to  most  recent
                         (partial) update. The caller of this interface (i.
                         e.  the  Hadoop  Reducer)   will  then  apply  the
                         updates to  Solr  in  the  order  returned  by the
                         orderUpdates() method.
                         The                                        default
                         RetainMostRecentUpdateConflictResolver
                         implementation ignores  all  but  the  most recent
                         document version, based on  a configurable numeric
                         Solr    field,    which     defaults     to    the
                         file_last_modified timestamp (default: org.apache.
                         solr.hadoop.dedup.
                         RetainMostRecentUpdateConflictResolver)
  --reducers INTEGER     Tuning knob that indicates  the number of reducers
                         to  index  into.  0  indicates  that  no  reducers
                         should be  used,  and  documents  should  be  sent
                         directly  from  the  mapper  tasks  to  live  Solr
                         servers.  -1  indicates   use   all  reduce  slots
                         available on the  cluster.  -2  indicates  use one
                         reducer  per  output  shard,  which  disables  the
                         mtree merge  MR  algorithm.  The  mtree  merge  MR
                         algorithm improves scalability  by  spreading load
                         (in  particular  CPU  load)   among  a  number  of
                         parallel reducers that  can  be  much  larger than
                         the number of solr  shards  expected  by the user.
                         It can  be  seen  as  an  extension  of concurrent
                         lucene merges  and  tiered  lucene  merges  to the
                         clustered case. The  subsequent  mapper-only phase
                         merges  the  output  of   said   large  number  of
                         reducers to the number  of  shards expected by the
                         user,   again   by    utilizing   more   available
                         parallelism on the cluster. (default: -1)
  --max-segments INTEGER
                         Tuning knob that indicates  the  maximum number of
                         segments to be contained  on  output  in the index
                         of each reducer shard.  After  a reducer has built
                         its output index  it  applies  a  merge  policy to
                         merge segments  until  there  are  <=  maxSegments
                         lucene  segments  left  in   this  index.  Merging
                         segments involves reading  and  rewriting all data
                         in all these  segment  files, potentially multiple
                         times,  which  is  very  I/O  intensive  and  time
                         consuming. However, an  index  with fewer segments
                         can later be merged  faster,  and  it can later be
                         queried  faster  once  deployed  to  a  live  Solr
                         serving shard. Set  maxSegments  to  1 to optimize
                         the index for low query  latency. In a nutshell, a
                         small maxSegments  value  trades  indexing latency
                         for subsequently improved query  latency. This can
                         be  a  reasonable  trade-off  for  batch  indexing
                         systems. (default: 1)
  --fair-scheduler-pool STRING
                         Optional tuning knob  that  indicates  the name of
                         the fair scheduler  pool  to  submit  jobs to. The
                         Fair Scheduler is a  pluggable MapReduce scheduler
                         that provides a way to  share large clusters. Fair
                         scheduling is a method  of  assigning resources to
                         jobs such that all jobs  get, on average, an equal
                         share of resources  over  time.  When  there  is a
                         single job  running,  that  job  uses  the  entire
                         cluster. When  other  jobs  are  submitted,  tasks
                         slots that free up are  assigned  to the new jobs,
                         so that each job gets  roughly  the same amount of
                         CPU time.  Unlike  the  default  Hadoop scheduler,
                         which forms a queue of  jobs, this lets short jobs
                         finish in reasonable time  while not starving long
                         jobs. It is also an  easy  way  to share a cluster
                         between multiple of users.  Fair  sharing can also
                         work with  job  priorities  -  the  priorities are
                         used as  weights  to  determine  the  fraction  of
                         total compute time that each job gets.
  --dry-run              Run in local mode  and  print  documents to stdout
                         instead of loading them  into  Solr. This executes
                         the  morphline  in  the  client  process  (without
                         submitting a job  to  MR)  for  quicker turnaround
                         during early  trial  &  debug  sessions. (default:
                         false)
  --log4j FILE           Relative or absolute  path  to  a log4j.properties
                         config file on the  local  file  system. This file
                         will  be  uploaded  to   each  MR  task.  Example:
                         /path/to/log4j.properties
  --verbose, -v          Turn on verbose output. (default: false)

Generic options supported are
  --conf <configuration file>
                         specify an application configuration file
  -D <property=value>    use value for given property
  --fs <local|namenode:port>
                         specify a namenode
  --jt <local|jobtracker:port>
                         specify a job tracker
  --files <comma separated list of files>
                         specify comma separated files to  be copied to the
                         map reduce cluster
  --libjars <comma separated list of jars>
                         specify comma separated  jar  files  to include in
                         the classpath.
  --archives <comma separated list of archives>
                         specify comma separated archives  to be unarchived
                         on the compute machines.

The general command line syntax is
bin/hadoop command [genericOptions] [commandOptions]

Examples: 

# (Re)index a table in GoLive mode based on a local indexer config file
hadoop --config /etc/hadoop/conf jar hbase-indexer-mr-*-job.jar --conf \
/etc/hbase/conf/hbase-site.xml -D 'mapred.child.java.opts=-Xmx500m' \
--hbase-indexer-file indexer.xml --zk-host 127.0.0.1/solr --collection \
collection1 --go-live --log4j src/test/resources/log4j.properties

# (Re)index a table in GoLive mode using a local morphline-based indexer config file
hadoop --config /etc/hadoop/conf jar hbase-indexer-mr-*-job.jar --conf \
/etc/hbase/conf/hbase-site.xml -D 'mapred.child.java.opts=-Xmx500m' \
--hbase-indexer-file src/test/resources/morphline_indexer_without_zk.xml \
--zk-host 127.0.0.1/solr --collection collection1 --go-live --morphline-file \
src/test/resources/morphlines.conf --output-dir \
hdfs://c2202.mycompany.com/user/$USER/test --overwrite-output-dir --log4j \
src/test/resources/log4j.properties

# (Re)index a table in GoLive mode
hadoop --config /etc/hadoop/conf jar hbase-indexer-mr-*-job.jar --conf \
/etc/hbase/conf/hbase-site.xml -D 'mapred.child.java.opts=-Xmx500m' \
--hbase-indexer-file indexer.xml --zk-host 127.0.0.1/solr --collection \
collection1 --go-live --log4j src/test/resources/log4j.properties

# (Re)index a table with direct writes to SolrCloud
hadoop --config /etc/hadoop/conf jar hbase-indexer-mr-*-job.jar --conf \
/etc/hbase/conf/hbase-site.xml -D 'mapred.child.java.opts=-Xmx500m' \
--hbase-indexer-file indexer.xml --zk-host 127.0.0.1/solr --collection \
collection1 --reducers 0 --log4j src/test/resources/log4j.properties

# (Re)index a table based on a indexer config stored in ZK
hadoop --config /etc/hadoop/conf jar hbase-indexer-mr-*-job.jar --conf \
/etc/hbase/conf/hbase-site.xml -D 'mapred.child.java.opts=-Xmx500m' \
--hbase-indexer-zk zk01 --hbase-indexer-name docindexer --go-live --log4j \
src/test/resources/log4j.properties