v0.5.8, 2017-02-01 -- upload_dirs, pre-filters
 * automatically tarball and upload directories with --dir, setup hooks (#23)
 * specify path for inter-step output with --step-output-dir #263
 * jobs:
   * better --help printout
   * deprecated option groups in MRJobs
   * deprecated MRJob.get_all_option_groups()
   * overriding *_pre_filter() methods in MRJob works again (#1521)
   * all step types accept jobconf (#1447)
   * quieted warning about SORT_VALUES on Hadoop 2 (#1286)
 * all runners:
   * wrap tasks that require pipes with sh_bin, not bash (#1330)
 * local runner:
   * allows non-zero exit status from pre-filters (#1524)
   * pre-filters can now handle compressed input (#1061)
 * EMR runner:
   * fetch logs from task nodes as well as core nodes (#1400)
     * use ListInstances rather than dfsadmin to get node list (#1345)
 * moved mrjob.util.bunzip2_stream() to mrjob.cat
 * moved mrjob.util.gunzip_stream() to mrjob.cat
 * deprecated:
   * mrjob.util.args_for_opt_dest_subset()
   * mrjob.util.bash_wrap()
   * mrjob.util.populate_option_groups_with_options()
   * mrjob.util.scrape_options_and_index_by_dest()
   * mrjob.util.tar_and_gz()
   * SSHFilesystem.ssh_slave_hosts()

v0.5.7, 2016-12-19 -- Spark
 * EMR and Hadoop runners:
   * full support for Spark (#1320)
     * includes spark() method in MRJob and SparkStep/SparkScriptStep
   * can use environment variables and ~ in hadoop_streaming_jar option
 * EMR runner:
   * default AMI version is now 4.8.2 (#1486)
   * default instance type is m1.large when running Spark jobs (#1465)
   * added debug logging for matching available pooled clusters (#1449)
   * defaults to cheapest instance type that will work (#1369)
   * master bootstrap script always created when pooling
   * no longer crashes when trying to use missing ssh binary (#1474)
   * pooled clusters may have 1000 steps (#1463)
   * failed jobs no longer reported as 100% complete (#793)
 * All runners:
   * py_files option for Spark and streaming steps (#1375)
   * bootstrap mrjob with a .zip rather than a tarball
   * options refactor, added missing command-line switches (#1439)
 * mrjob terminate-idle-clusters works with all step types (#1363)
 * log interpretation
   * dropped unnecessary container-to-attempt-ID mapping (#1487)
   * more efficient search for task log errors (#1450)
   * cleaner error messages when bootstrapped mrjob won't compile
 * JarSteps
   * now support libjars, jobconf (#1481)
   * JarStep.{INPUT,OUTPUT} are deprecated (use mrjob.step.{INPUT,OUTPUT})
 * is_uri() now only matches URIs containing "://" (#1455)
 * works in Anaconda3 Jupyter Notebook (#1441)
 * deprecated mrjob.parse.is_windows_path()
 * deprecated mrjob.parse.parse_key_value_list()
 * deprecated mrjob.parse.parse_port_range_list()
 * deprecated mrjob.util.scrape_options_into_new_groups()
 * deprecated non-strict protocols (#1452)
 * deprecated python_archives (#1056)

v0.5.6, 2016-09-12 -- dataproc crash fix
 * Dataproc runner:
   * fix Hadoop version crash on unknown image version (#1428)
 * EMR and Hadoop runners:
   * prioritize task errors as probable cause of failure (#1429)
   * ignore Java stack trace in task stderr logs (#1430)

v0.5.5, 2016-09-05 -- missing ami_version option
 * EMR runner:
   * deprecate, don't remove ami_version option in v0.5.4 (#1421)
   * update memory/CPU stats for EC2 instances for pooling (#1414)
   * pooling treats application names as case-insensitive (#1417)

v0.5.4, 2016-08-26 -- pooling auto-recovery
 * jobs:
   * pass_through_option(), for existing command-line options (#1075)
     * MRJob.options.runner now defaults to None, not 'inline' or 'local'
 * runners:
   * all:
     * names of uploaded files now never start with . or _ (#1200)
   * Hadoop:
     * log parsing:
       * handles more log4j patterns (#1405)
       * gracefully handles IOError from exists() (#1355)
     * fixed crash bug in Hadoop FS on Python 3 (#1396)
   * EMR:
     * pooling auto-recovers from joining a cluster that self-terminated (#708)
     * log fetching uses sudo on 4.3.0+ AMIs (#1244)
     * fixed broken --ssh-bind-ports switch (#1402)
     * idle termination script now only runs on master node (#1398)
     * ssh tunnel connects to internal IP of resource manager (#1397)
     * AWS credentials no longer logged in verbose mode (#1353)
     * many option names are now more generic (#1247)
       * ami_version -> image_version
         * accidentally removed ami_version option entirely (fixed in v0.5.5)
       * aws_availability_zone -> zone
       * aws_region -> region
       * check_emr_status_every -> check_cluster_every
       * ec2_core_instance_bid_price -> core_instance_bid_price
       * ec2_core_instance_type -> core_instance_type
       * ec2_instance_type -> instance_type
       * ec2_master_instance_bid_price -> master_instance_bid_price
       * ec2_master_instance_type -> master_instance_type
       * ec2_task_instance_bid_price -> task_instance_bid_price
       * ec2_task_instance_type -> task_instance_type
       * emr_tags -> tags
       * num_ec2_core_instances -> num_core_instances
       * num_ec2_task_instances -> num_task_instances
       * s3_log_uri -> cloud_log_dir
       * s3_sync_wait_time -> cloud_fs_sync_secs
       * s3_tmp_dir -> cloud_tmp_dir
       * s3_upload_part_size -> cloud_upload_part_size
     * num_ec2_instances is deprecated (use num_core_instances)
     * ec2_slave_instance_type is deprecated (use core_instance_type)
     * hadoop_streaming_jar_on_emr is deprecated (#1405)
       * hadoop_streaming_jar handles this instead with file:// URIs
     * bootstrap_python does nothing on AMI 4.6.0+, as not needed (#1358)
 * mrjob audit-emr-usage should show less/no API throttling warnings (#1091)

v0.5.3, 2016-07-15 -- libjars
 * jobs:
   * LIBJARS and libjars method (#1341)
 * runners:
   * all:
     * .cpython-3*.pyc files no longer included when bootstrapping mrjob
   * local:
     *PATH envvars combined with local separator (#1321)
   * Hadoop and EMR:
     * libjars option (#198)
     * fixes to ordering of generic and JAR-specific options (#1331, #1332)
   * Hadoop:
     * more default log dirs (#1339)
     * hadoop_tmp_dir handles ~ and envvars (#1322) (broken in v0.5.0)
   * EMR:
     * determine cause of failure of bootstrap scripts (#370)
       * master bootstrap script now redirects stdout to stderr
     * emr_configurations option (#1276)
     * subnet option (#1323)
     * SSH tunnel opened as soon as cluster is ready (#1115)
     * SSH tunnel leaves stdin alone (#1161)
 * combine_lists() treats dicts as values, not sequences

v0.5.2, 2016-05-23 -- initial Cloud Dataproc support
 * basic support for Google Cloud Dataproc (#1243)
   * lacks log interpretation, JarStep support
 * on EMR, wait for steps to complete in correct order (#1316)
 * correctly handle ~ in include path in mrjob.conf (#1308)
 * new emr_applications option (#1293)
 * fix running deprecated tools with python -m (#1312)
 * fix ssh tunneling to 2.x AMIs on EMR in VPCs (#1311)

v0.5.1, 2016-04-29 -- post-release bugfixes
 * strict_protocols in mrjob.conf is no longer ignored (#1302)
 * check_input_paths in mrjob.conf is no longer ignored
 * partitioner() is no longer ignored, fixing SORT_VALUES (#1294)
   * --partitioner switch is deprecated
 * improved probable cause of error from pre-YARN logs (#1288)
 * ssh_bind_ports now defaults to (x)range, not list (#1284)
 * mrjob terminate-idle-clusters handles debugging jar from boto 2.40.0 (#1306)

v0.5.0, 2016-03-28 -- the future is in the past
 * supports Python 3 (#989)
 * requires boto 2.35.0 or newer (#980)
   * removed many workarounds for S3 and EMR (#980), IAM (#1062)
 * jobs:
   * is_mapper_or_reducer() is now is_task() (#1072)
   * mr() no longer takes positional arguments (#814)
   * removed jar() (use mrjob.step.JarStep)
   * removed testing methods parse_counters() and parse_output()
   * protocols:
     * protocols are strict by default (#724)
     * JSON protocols use ujson when available, then simplejson (#1002, #1266)
       * can explicitly choose Standard, Simple or Ultra JSON protocol
     * raw protocols handle bytes or unicode depending on Python version
       * can explicitly choose Text or Bytes protocol
   * mrjob.step:
      * JarStep only takes "args" and "main_class" keyword args
      * removed MRJobStep (use MRStep)
 * runners:
   * All runners:
     * totally revamped log handling (#1123)
     * runner status/log messages are less noisy (#1044)
     * don't bootstrap mrjob if interpreter is set (#1041)
     * fs methods path_exists() and path_join() are now exists() and join()
     * deprecation warning: use runner.fs explicitly (#1146)
     * changes to cleanup options:
       * removed IS_SUCCESSFUL (use ALL)
       * LOCAL_SCRATCH is now LOCAL_TMP (#318)
       * new HADOOP_TMP option handles HDFS cleanup (#1261)
       * REMOTE_SCRATCH is now CLOUD_TMP (#1261)
     * base_tmp_dir option is now local_tmp_dir (#318)
     * non-inline runners raise StepFailedException on step failure (#1219)
     * steps_python_bin defaults to current python interpreter (#1038)
     * _job_name is now _job_key (#982)
   * EMR:
     * default AWS region is us-west-2 (#1025)
     * default instance type is m1.medium (#992)
     * visible_to_all_users defaults to true (#1016)
     * matches your minor version of Python 2 on 3.x and 4.x AMIs (#1265)
     * 4.x AMIs are supported (#1105)
       * added --release-label switch (--ami-version 4.x.y also works)
     * can fetch counters and probable cause of failure on 3.x and 4.x AMIs
     * SSH tunnel now works on 3.x and 4.x AMIs (#1013)
       * ssh_tunnel_to_job_tracker option is now ssh_tunnel
     * correctly fetch step logs by step ID (#1117)
     * bootstrap_python option
     * s3_scratch_uri option is now s3_tmp_dir (#318)
     * aws_region is no longer inferred from s3_tmp_dir
     * create/select temp bucket in same region as EMR jobs (#687)
     * added iam_endpoint option (#1067)
     * removed s3_conn args from methods in EMRJobRunner and S3Filesystem
     * S3 Filesystem:
       * connect to each S3 bucket on appropriate endpoint (#1028)
         * fall back to default if we can't get bucket location (#1170)
       * removed special treatment of _$folder$ keys
         * removed deprecated S3Filesystem method get_s3_folder_keys()
       * recurse "subdirectories" even if uri lacks trailing / (#1183)
     * removed iam_job_flow_role option (use iam_instance_profile)
     * custom hadoop_streaming_jar gets properly uploaded
     * job cleanup temporarily disabled (#1241)
     * pooling respects key pair (#1230)
     * idle cluster self-termination respects non-streaming jobs (#1145)
     * deprecated "latest" AMI version not passed through to EMR (#1269)
     * emr_job_flow_id option is now cluster_id (#1082)
     * emr_job_flow_pool_name is now pool_name (#1082)
     * pool_emr_job_flows is now pool_clusters (#1082)
   * Hadoop
     * works out-of the-box on most Hadoop setups (#1160)
     * works out-of the box inside EMR (2.x, 3.x, and 4.x AMIs)
     * counters are parsed from Hadoop binary stderr in YARN (#1153)
     * can find logs and probable cause of failure in YARN (#1195)
       * will search in <output dir>/_logs, to support Cloudera (#565)
     * HDFS Filesystem:
       * use fs -ls -R and fs -rm -R in YARN (#1152)
       * mkdir() now uses -p on YARN (#991)
       * fs.du() now works on YARN (#1155)
       * fs.du() now returns 0 for nonexistent files instead of erroring
       * fs.rm() now uses -skipTrash
     * dropped support for Hadoop prior to 0.20.203 (#1208)
     * added hadoop_log_dirs option
     * hdfs_scratch_dir option is now hadoop_tmp_dir (#318)
     * hadoop_home is deprecated
     * uses -D and correct property name when step has no reduces (#1213)
   * Inline/Local
     * runner.fs raises IOError if passed URIs (#1185)
     * version-agnostic by default (#735)
     * removed ignored hadoop_extra_args and hadoop_streaming_jar opts (#1275)
     * inline runner uses multiple splits by default (#1276)
 * removed mrjob.compat.get_jobconf_value() (use jobconf_from_env())
 * removed mrjob.compat methods to support Hadoop prior to 0.20.203:
   * supports_combiners_in_hadoop_streaming()
   * supports_new_distributed_cache_options()
   * uses_generic_jobconf()
 * removed mrjob.conf.combine_cmd_lists()
 * removed fetch-logs tool (#1127)
 * mrjob subcommands use "cluster" rather than "job-flow" (#1082)
   * create-job-flow is now create-cluster
   * terminate-idle-job-flows is now terminate-idle-clusters
   * terminate-job-flow is now terminate-cluster
 * Python-version-specific mrjob-x and mrjob-x.y commands (#1104)
 * use followlinks=True with os.walk()
 * all internal constants/functions/methods explicitly start with _ (#681)
 * mrjob.util:
   * file_ext() takes filename, not path
   * random_identifier() moved here from mrjob.aws
   * buffer_iterator_to_line_iterator() is now to_lines()
     * to_lines() no longer appends a newline to data (#819)
   * removed extract_dir_for_tar()
   * gunzip_stream() now yields chunks, not lines
   * removed hash_object()

v0.4.6, 2015-11-09 -- config files
 * PyYAML>=3.08 is required
 * !clear tag in conf files (#1162)
 * combine_lists() and combine_path_lists() can handle scalars (#1172)
 * include: paths in conf files are relative to real path of conf file (#1166)
 * mrjob.conf.combine_cmd_lists() is deprecated (#1168)
 * EMR runner: pool_wait_minutes can now be loaded from mrjob.conf (#1070)
 * support for wheel packaging format (#1140)

v0.4.5, 2015-07-28 -- DescribeJobFlows begone
 * boto>=2.6.0 is required (used to be 2.2.0)
 * runners:
   * EMR:
     * moved off deprecated DescribeJobFlows API (#876)
       * time-to-end-of-hour now uses creation time, not "start" time
     * aws_security_token for temporary credentials (#1003)
     * Use AWS managed policies when creating IAM objects (#1026)
     * Fall back to default role/instance profile when no IAM access (#1008)
     * added emr_tags option (#1058)
     * added get_ami_version() method
     * hadoop_version option no longer has any effect (#1017)
   * Hadoop:
     * --hadoop-home switch now works (#1037)
 * EMR tools:
   * added switches for AWS connection options etc. (#1087)
   * mrboss is available from command line tool: mrjob boss [args]
   * terminate_idle_job_flows:
     * less prone to race condition (#910)
     * prints results to stdout in dry_run mode (#1102)
     * job flows stuck in STARTING state no longer considered idle
   * report_long_jobs reports job flows stuck in STARTING state
   * collect_emr_stats and job_flow_pool are deprecated
 * more efficient decoding of bz2 files
 * mrjob.retry.RetryWrapper raises exception when out of tries (#1093)

v0.4.4, 2015-04-21 -- EMRgency!
 * runners:
   * EMR:
     * Create IAM objects as needed (unbreaks mrjob for new accounts) (#999)
     * --iam-job-flow-role renamed to --iam-instance-profile (#1001)
     * new --iam-service-role option (#1005)

v0.4.3, 2015-04-08 -- SO many bugfixes
 * jobs:
   * MRStep's constructor treats kwarg=None same as not setting it (#970)
   * parse_counters() and parse_output() are deprecated (#829)
   * self.mr is deprecated in favor of MRStep (#815)
 * runners:
   * All runners:
     * You can now set strict_protocols from mrjob.conf (#726)
       * new --no-strict-protocols command-line option
     * streaming output from closed runner shows a warning (#853)
   * EMR:
     * --check-input-paths and --no-check-input-paths options (#864)
     * skip (very slow) validation of s3 buckets if boto < 2.25.0 (#865)
     * Fix for max_hours_idle bug that was terminating job flows early (#932)
     * --emr-api-param allows users to pass additional parameters to boto's
       EMR API (#879)
       * unset paramaters with --no-emr-api-param
     * bootstrap_python_packages (deprecated) now works on 3.x EMR AMIs (#863)
     * Use TERMINATE_CLUSTER instead of deprecated TERMINATE_JOB_FLOW (#974)
     * updated EC2 instance type data for pooling (#995)
   * Hadoop:
     * exclude hadoop source jars when looking for streaming jar (#861)
     * Fixed mkdir_on_hdfs for Hadoop version 2.x (#923)
     * Fixed hadoop_bin on Windows (#843)
   * Local
     * bootstrap mrjob by default (#984)
   * Inline
     * fix for add_file_option() (#851)
     * cd to job's working directory before instantiating mrjob class (#988)
 * Use pytest to run tests (#898)
 * collect-emr-active-stats subcommand (#947)
 * Using xtrace flag to get more output during bootstrap (#943)
 * Fixed log printouts for command line tools (#901)
 * Fix to avoid interpreting windows paths as URIs (#880)
 * Better error message when ssh keyfile is missing (#858)
 * Update EMR tool ISO8601 parsing to be consistent with EMR runner (#869)
 * Dropped support for Python 2.5 (#713)
   * Dropped support for the 1.x EMR AMI series, which uses Python 2.5

v0.4.2, 2013-11-27 -- that's one small step for a JAR
 * jobs:
   * can interpolate input and output path(s) into arguments of JarSteps,
     so they can be part of multi-step jobs (#773)
     * see mrjob/examples/mr_jar_step_example.py
   * JarStep now takes keyword arguments only (#769)
     * removed useless "name" field; "step_args" is now just "args"
   * MRJobStep (usually accessed via MRJob.mr()) is now MRStep
 * runners:
   * All runners:
     * --setup is now fully functional (#206)
       * --python-archive, --setup-cmd, and --setup-script are deprecated
     * --bootstrap option works and uses sh (#206)
       * --bootstrap-cmd, --bootstrap-file, --bootstrap-python-package,
         --bootstrap-script are deprecated
     * setup commands can no longer corrupt a task's input and output (#803)
     * sh_bin is now "sh -e" by default so setup fails fast (#810)
       * default is "/bin/sh -e" on EMR
   * EMR:
     * JarSteps work again (#763)
     * auto-uploads jars for JarSteps (#772)
       * JARs on the EMR instances can be accessed with file:/// URIs
     * ssh_cat() no longer raises an error when catting a file
       containing an error (#807)
     * Fixed SignatureDoesNotMatchError that happens with boto 2.10.0+
       with Python prior to 2.7.5 (#778)
   * Hadoop:
     * now handles JarSteps too (#770)
 * Fix to mrjob.parse.urlparse() that was breaking Python 2.5
 * mrjob.util.buffer_iterator_to_line_iterator() is now more efficient
   and uses a bounded amount of memory
 * bz2 decompression no longer discards data (#817)

v0.4.1, 2013-09-16 -- secondary sort and self-terminating job flows
 * jobs:
   * SORT_VALUES: Secondary sort by value (#240)
     * see mrjob/examples/
   * can now override jobconf() again (#656)
   * renamed mrjob.compat.get_jobconf_value() to jobconf_from_env()
   * examples:
     * bash_wrap/ (mapper/reducer_cmd() example)
     * mr_most_used_word.py (two step job)
     * mr_next_word_stats.py (SORT_VALUES example)
 * runners:
   * All runners:
     * single setup option works but is not yet documented (#206)
     * setup now uses sh rather than python internally
   * EMR runner:
     * max_hours_idle: self-terminating idle job flows (#628)
       * mins_to_end_of_hour option gives finer control over self-termination.
     * Can reuse pooled job flows where previous job failed (#633)
     * Throws IOError if output path already exists (#634)
     * Gracefully handles SSL cert issues (#621, #706)
     * Automatically infers EMR/S3 endpoints from region (#658)
     * ls() supports s3n:// schema (#672)
     * Fixed log parsing crash on JarSteps (#645)
     * visible_to_all_users works with boto <2.8.0 (#701)
     * must use --interpreter with non-Python scripts (#683)
     * cat() can decompress gzipped data (#601)
   * Hadoop runner:
     * check_input_paths: can disable input path checking (#583)
     * cat() can decompress gzipped data (#601)
   * Inline/Local runners:
     * Fixed counter parsing for multi-step jobs in inline mode
     * Supports per-step jobconf (#616)
 * Documentation revamp
 * mrjob.parse.urlparse() works consistently across Python versions (#686)
 * deprecated:
   * many constants in mrjob.emr replaced with functions in mrjob.aws
 * removed deprecated features:
   * old conf locations (~/.mrjob and in PYTHONPATH) (#747)
   * built-in protocols must be instances (#488)

v0.4.0, 2013-04-30 -- Slouching toward nirvana
 * Changes:
   * 'mrjob' command (#225)
   * Changed default runner from 'local' to 'inline' (#423)
   * Local runner no longer adds working directory to PYTHONPATH of
     subprocesses; use inline runner instead (#424)
   * Requires boto 2.2.0 or later
   * Filesystem functionality moved out of MRJobRunner into into 'fs' objects
     but forwarded from runners for backward compatibility
   * Changed exception hierarchy of mrjob.ssh (which is private but
     important)
   * Inline and local runners now inherit from the SimMRJobRunner class and thus share most
     of their implementation
   * Internal data structure for representing a step is much richer, allowing
     many cool future features (#479)
   * mrjob detects Hadoop version from EMR based on API responses instead of
     what's in the config (#611)
 * New features:
   * Support for non-Hadoop Streaming jar steps (#499)
   * Support for arbitrary commands as Hadoop Streaming
     mappers/combiners/reducers
   * mapper_pre_filter, combiner_pre_filter, and reducer_pre_filter allow
     running of a UNIX command in front of tasks to filter input outside of
     the interpreter
   * Hadoop runner uses PTY to print output from the Hadoop sub process to the
     console (#580)
   * mrjob knows how to terminate the job on cleanup (Ctrl+C closes the job).
     (#353)
   * Allow use of multiple -c flags on the command line (#420)
 * Bug fixes:
   * Silenced some incorrect warnings about ignored options in 'inline' runner
   * terminate_idle_job_flows uses the default configuration to terminate idle jobs (#559)
 * Removed deprecated functionality:
   * --hadoop-*-format
   * --*-protocol switches
   * MRJob.DEFAULT_*_PROTOCOL
   * MRJob.get_default_opts()
   * MRJob.protocols()
   * PROTOCOL_DICT
   * IF_SUCCESSFUL
   * DEFAULT_CLEANUP
   * S3Filesystem.get_s3_folder_keys()

v0.3.5, 2012-08-21 -- The Last Ride of v0.3.x[?]
 * EMR:
   * --pool-wait-minutes option lets you wait up to X minutes before creating a
     job flow (#455)
   * Job flow ID included in error messages on failure (#452)
   * JOB and JOB_FLOW cleanup options (#485, #455)
 * EMR and Hadoop:
   * Compatibility fixes related to deprecated options and Hadoop's bizarre
     non-sequential version numbers (#489, #534)
 * Other:
   * Warn when *_PROTOCOL is not a class (#490)
 * Bug fixes:
   * Unicode strings can be used when specifying interpreters (#431)
   * --enable-emr-logging no longer causes the wrong counters/logs to be parsed
     (#446)
   * TMP_DIR inserted into 'sort' environment variables (#477)
   * Setting hadoop_home in mrjob.conf works again
   * Gzipped input files work when specified with relative paths (#494)
   * Passthrough options are not re-ordered when sent to Hadoop Streaming
     (#509)

v0.3.4.1, 2012-06-12 -- The test suite doesn't catch everything...
 * Local mode doesn't try to send multiple mappers to the same output file
   when using multiple compressed files as input

v0.3.4, 2012-06-11 -- We are friendly people.
 * Experimental support for IronPython in the local and inline runners
 * set_status() and increment_counter() will encode messages/names of type
   'unicode' as UTF-8 when writing to Hadoop Streaming
 * EMR and Hadoop counter parsing is more correct
 * mrjob.tools.emr.fetch_logs fetches logs from S3 when asked instead of
   incorrectly refusing to do so
 * jobconf values can be booleans in mrjob.conf as well as 'true' and 'false'
   strings
 * hadoop_version can be a float in mrjob.conf, but a warning is printed to the
   console
 * Command line help is split across several --help-* commands
 * Local runner sorts output consistently

v0.3.3.2, 2012-04-10 -- It's a race [condition]!
 * Option parsing no longer dies when -- is used as an argument (#435)
 * Fixed race condition where two jobs can join same job flow thinking it is
   idle, delaying one of the jobs (#438)
 * Better error message when a config file contains no data for the current
   runner (#433)

v0.3.3.1, 2012-04-02 -- Hothothothothothothotfix
 * Fixed S3 locking mechanism parsing of last modified time to work around an
   inconsistency in the EMR API

v0.3.3, 2012-03-29 -- Bug...bug...bug...bug...bug...FEATURE!
 * EMR:
   * Error detection code follows symlinks in Hadoop logs (#396)
   * terminate_idle_job_flows locks job flows before terminating them (#391)
   * terminate_idle_job_flows -qq silences all output (#380)
 * Other fixes:
   * mr_tower_of_powers test no longer requires Testify (#395)
   * Various runner du() implementations no longer broken (#393, #394)
   * Hadoop counter parser regex handles long lines better (#388)
   * Hadoop counter parser regex is more correct (#305)
   * Better error when trying to parse YAML without PyYAML (#348)

v0.3.2, 2012-02-22 -- AMI versions, spot instances, and more
 * Docs:
   * 'Testing with mrjob' section in docs (includes #321)
   * MRJobRunner.counters() included in docs (#321)
   * terminate_idle_job_flows is spelled correctly in docs (#339)
 * Running jobs:
   * local mode:
     * Allow non-string jobconf values again (this changed in v0.3.0)
     * Don't split *.gz files (#333)
   * emr mode:
     * Spot instance support via ec2_*_instance_bid_price and renamed instance
       type/number options (#219)
     * ami_version option to allow switching between EMR AMIs (#306)
     * 'Error while reading from input file' displays correct file (#358)
     * python_bin used for bootstrap_python_packages instead of just 'python'
       (#355)
     * Pooling works with bootstrap_mrjob=False (#347)
     * Pooling makes sure a job flow has space for the new job before joining
       it (#324)
 * EMR tools:
   * create_job_flow no longer tries to use an option that does not exist
     (#349)
   * report_long_jobs tool alerts on jobs that have run for more than X hours
     (#345)
   * mrboss no longer spells stderr 'stsderr'
   * terminate_idle_job_flows counts jobs with pending (but not running)
     steps as idle (#365)
   * terminate_idle_job_flows can terminate job flows near the end of a
     billable hour (#319)
   * audit_usage breaks down job flows by pool (#239)
   * Various tools (e.g. audit_usage) get list of job flows correctly (#346)

v0.3.1, 2011-12-20 -- Nooooo there were bugs!
 * Instance-type command-line arguments always override mrjob.conf (Issue #311)
 * Fixed crash in mrjob.tools.emr.audit_usage (Issue #315)
 * Tests now use unittest; python setup.py test now works (Issue #292)

v0.3.0, 2011-12-07 -- Worth the wait
 * Configuration:
   * Saner mrjob.conf locations (Issue #97):
     * ~/.mrjob is deprecated in favor of ~/.mrjob.conf
     * searching in PYTHONPATH is deprecated
     * MRJOB_CONF environment variable for custom paths
 * Defining Jobs (MRJob):
   * Combiner support (Issue #74)
   * *_init() and *_final() methods for mappers, combiners, and reducers
     (Issue #124)
   * mapper/combiner/reducer methods no longer need to contain a yield
     statement if they emit no data
   * Protocols:
     * Protocols can be anything with read() and write() methods, and are
       instances by default (Issue #229)
     * Set protocols with the *_PROTOCOL attributes or by re-defining the
       *_protocol() methods
     * Built-in protocol classes cache the encoded and decoded value of the
       last key for faster decoding during reducing (Issue #230)
     * --*protocol switches and aliases are deprecated (Issue #106)
   * Set Hadoop formats with HADOOP_*_FORMAT attributes or the hadoop_*_format()
     methods (Issue #241)
     * --hadoop-*-format switches are deprecated
     * Hadoop formats can no longer be set from mrjob.conf
   * Set jobconf with JOBCONF attribute or the jobconf() method (in addition
     to --jobconf)
   * Set Hadoop partitioner class with --partitioner, PARTITIONER, or
     partitioner() (Issue #6)
   * Custom option parsing (Issue #172)
   * Use mrjob.compat.get_jobconf_value() to get jobconf values from environment
 * Running jobs:
   * All modes:
     * All runners are Hadoop-version aware and use the correct jobconf and
       combiner invocation styles (Issue #111)
     * All types of URIs can be passed through to Hadoop (Issue #53)
     * Speed up steps with no mapper by using cat (Issue #5)
     * Stream compressed files with cat() method (Issue #17)
     * hadoop_bin, python_bin, and ssh_bin can now all take switches (Issue #96)
     * job_name_prefix option is gone (was deprecated)
     * Better cleanup (Issue #10):
       * Separate cleanup_on_failure option
       * More granular cleanup options
     * Cleaner handling of passthrough options (Issue #32)
   * emr mode:
     * job flow pooling (Issue #26)
     * vastly improved log fetching via SSH (Issue #2)
       * New tool: mrjob.tools.emr.fetch_logs
     * default Hadoop version on EMR is 0.20 (was 0.18)
     * ec2_instance_type option now only sets instance type for slave nodes
       when there are multiple EC2 instances (Issue #66)
     * New tool: mrjob.tools.emr.mrboss for running commands on all nodes and
       saving output locally
   * inline mode:
     * Supports cmdenv (Issue #136)
     * Passthrough options can now affect steps list (Issue #301)
   * local mode:
     * Runs 2 mappers and 2 reducers in parallel by default (Issue #228)
     * Preliminary Hadoop simulation for some jobconf variables (Issue #86)
 * Misc:
   * boto 2.0+ is now required (Issue #92)
   * Removed debian packaging (should be handled separately)

v0.2.8, 2011-09-07 -- Bugfixes and betas
 * Fix log parsing crash dealing with timeout errors
 * Make mr_travelling_salesman.py work with simplejson
 * Add emr_additional_info option, to support EMR beta features
 * Remove debian packaging (should be handled separately)
 * Fix crash when creating tmp bucket for job in us-east-1

v0.2.7, 2011-07-12 -- Hooray for interns!
 * All runner options can be set from the command line (Issue #121)
   * Including for mrjob.tools.emr.create_job_flow (Issue #142)
 * New EMR options:
   * availability_zone (Issue #72)
   * bootstrap_actions (Issue #69)
   * enable_emr_debugging (Issue #133)
 * Read counters from EMR log files (Issue #134)
 * Clean old files out of S3 with mrjob.tools.emr.s3_tmpwatch (Issue #9)
 * EMR parses and reports job failure due to steps timing out (Issue #15)
 * EMR bootstrap files are no longer made public on S3 (Issue #70)
 * mrjob.tools.emr.terminate_idle_job_flows handles custom hadoop streaming
   jars correctly (Issue #116)
 * LocalMRJobRunner separates out counters by step (Issue #28)
 * bootstrap_python_packages works regardless of tarball name (Issue #49)
 * mrjob always creates temp buckets in the correct AWS region (Issue #64)
 * Catch abuse of __main__ in jobs (Issue #78)
 * Added mr_travelling_salesman example

v0.2.6, 2011-05-24 -- Hadoop 0.20 in EMR, inline runner, and more
* Set Hadoop to run on EMR with --hadoop-version (Issue #71).
   * Default is still 0.18, but will change to 0.20 in mrjob v0.3.0.
 * New inline runner, for testing locally with a debugger
 * New --strict-protocols option, to catch unencodable data (Issue #76)
 * Added steps_python_bin option (for use with virtualenv)
 * mrjob no longer chokes when asked to run on an EMR job flow running
   Hadoop 0.20 (Issue #110)
 * mrjob no longer chokes on job flows with no LogUri (Issue #112)

v0.2.5, 2011-04-29 -- Hadoop input and output formats
 * Added hadoop_input/output_format options
 * You can now specify a custom Hadoop streaming jar (hadoop_streaming_jar)
 * extra args to hadoop now come before -mapper/-reducer on EMR, so
   that e.g. -libjar will work (worked in hadoop mode since v0.2.2)
 * hadoop mode now supports s3n:// URIs (Issue #53)

v0.2.4, 2011-03-09 -- fix bootstrapping mrjob
 * Fix bootstrapping of mrjob in hadoop and local mode (Issue #89)
 * SSH tunnels try to use the same port for the same job flow (Issue #67)
 * Added mr_postfix_bounce and mr_pegasos_svm to examples.
 * Retry on spurious 505s from EMR API

v0.2.3, 2011-02-24 -- boto compatibility
 * Fix incompatibility with boto 2.0b4 (Issue #91)

v0.2.2, 2011-02-15 -- GET/POST EMR issue
 * Use POST requests for most EMR queries (EMR was choking on large GETs)
 * find_probable_cause_of_failure() ignores transient errors (Issue #31)
 * --hadoop-arg now actually works (Issue #79)
   * on Hadoop, extra args are added first, so you can set e.g. -libjar
 * S3 buckets may now have . in their names
 * MRJob scripts now respect --quiet (Issue #84)
 * added --no-output option for MRJob scripts (Issue #81)
 * added --python-bin option (Issue #54)

v0.2.1, 2010-11-17 -- laststatechangereason bugfix
 * Don't assume EMR sets laststatechangereason

v0.2.0, 2010-11-15 -- Many bugfixes, Windows support
 * New Features/Changes:
   * EMRJobRunner now prints % of mappers and reducers completed when you
     enable the SSH tunnel.
   * Added mr_page_rank example
   * Added mrjob.tools.emr.audit_usage script (Issue #21)
   * You can specify alternate job owners with the "owner" option. Useful for
     auditing usage. (Issue #59)
   * The job_name_prefix option has been renamed to label (the old name still
     works but is deprecated)
   * bootstrap_cmds and bootstrap_scripts no longer automatically invoke sudo
 * Bugs Fixed/Cleanup:
   * bootstrap files no longer get uploaded to S3 twice (Issue #8)
   * When using add_file_option(), show_steps() can now see the local version
     of the file (Issue #45)
   * Now works on Windows (Issue #46)
   * No longer requires external jar, tar, or zip binaries (Issue #47)
   * mrjob-* scratch bucket is only created as needed (Issue #50)
   * Can now specify us-east-1 region explicitly (Issue #58)
   * mrjob.tools.emr.terminate_idle_job_flows leaves Hive jobs alone (Issue #60)

v0.1.0, 2010-10-28 -- Same code, better version. It's official!

v0.1.0-pre3, 2010-10-27 -- Pre-release to run Yelp code against
 * Added debian packaging
 * mrjob bootstrapping can now deal with symlinks in site-packages/mrjob
 * MRJobRunner.stream_output() can now be called multiple times

v0.1.0-pre2, 2010-10-25 -- Second pre-release after testing
 * Fixed small bugs that broke Python 2.5.1 and Python 2.7
 * Fixed reading mrjob.conf without yaml installed
 * Fix tests to work with modern simplejson and pipes.quote()
 * Auto-create temp bucket on S3 if we don't have one (Issue #16)
 * Auto-infer AWS region from bucket (Issue #7)
 * --steps now passes in all extra args (e.g. --protocol) (Issue #4)
 * Better docs

v0.1.0-pre1, 2010-10-21 -- Initial pre-release. YMMV!
