hadoop/src/contrib/hbase/CHANGES.txt

HBase Change Log


Trunk (unreleased changes)
  INCOMPATIBLE CHANGES
   HADOOP-2056 A table with row keys containing colon fails to split regions
   HADOOP-2079 Fix generated HLog, HRegion names

  NEW FEATURES
    HADOOP-2061 Add new Base64 dialects
    HADOOP-2084 Add a LocalHBaseCluster
    HADOOP-2068 RESTful interface (Bryan Duxbury via Stack)
    HADOOP-2316 Run REST servlet outside of master
                (Bryan Duxbury via Stack)

  OPTIMIZATIONS

  BUG FIXES
   HADOOP-2059 In tests, exceptions in min dfs shutdown should not fail test
               (e.g. nightly #272)
   HADOOP-2064 TestSplit assertion and NPE failures (Patch build #952 and #953)
   HADOOP-2124 Use of `hostname` does not work on Cygwin in some cases
   HADOOP-2083 TestTableIndex failed in #970 and #956
   HADOOP-2109 Fixed race condition in processing server lease timeout.
   HADOOP-2137 hql.jsp : The character 0x19 is not valid
   HADOOP-2109 Fix another race condition in processing dead servers,
               Fix error online meta regions: was using region name and not
               startKey as key for map.put. Change TestRegionServerExit to
               always kill the region server for the META region. This makes
               the test more deterministic and getting META reassigned was
               problematic.
   HADOOP-2155 Method expecting HBaseConfiguration throws NPE when given Configuration
   HADOOP-2156 BufferUnderflowException for un-named HTableDescriptors
   HADOOP-2161 getRow() is orders of magnitudes slower than get(), even on rows
               with one column (Clint Morgan and Stack)
   HADOOP-2040 Hudson hangs AFTER test has finished
   HADOOP-2274 Excess synchronization introduced by HADOOP-2139 negatively
               impacts performance
   HADOOP-2196 Fix how hbase sits in hadoop 'package' product
   HADOOP-2276 Address regression caused by HADOOP-2274, fix HADOOP-2173 (When
               the master times out a region servers lease, the region server
               may not restart)
   HADOOP-2253 getRow can return HBASE::DELETEVAL cells
               (Bryan Duxbury via Stack)
   HADOOP-2295 Fix assigning a region to multiple servers
   HADOOP-2234 TableInputFormat erroneously aggregates map values
   HADOOP-2308 null regioninfo breaks meta scanner
   HADOOP-2304 Abbreviated symbol parsing error of dir path in jar command
               (Edward Yoon via Stack)
   HADOOP-2320 Committed TestGet2 is managled (breaks build).
   HADOOP-2322 getRow(row, TS) client interface not properly connected
   HADOOP-2309 ConcurrentModificationException doing get of all region start keys
   HADOOP-2321 TestScanner2 does not release resources which sometimes cause the
               test to time out
   HADOOP-2315 REST servlet doesn't treat / characters in row key correctly
               (Bryan Duxbury via Stack)
   HADOOP-2332 Meta table data selection in Hbase Shell
               (Edward Yoon via Stack)
   HADOOP-2347 REST servlet not thread safe but run in a threaded manner
               (Bryan Duxbury via Stack)
   HADOOP-2365 Result of HashFunction.hash() contains all identical values
   HADOOP-2362 Leaking hdfs file handle on region split

  IMPROVEMENTS
   HADOOP-2401 Add convenience put method that takes writable
               (Johan Oskarsson via Stack)
   HADOOP-2074 Simple switch to enable DEBUG level-logging in hbase
   HADOOP-2088 Make hbase runnable in $HADOOP_HOME/build(/contrib/hbase)
   HADOOP-2126 Use Bob Jenkins' hash for bloom filters
   HADOOP-2157 Make Scanners implement Iterable
   HADOOP-2176 Htable.deleteAll documentation is ambiguous
   HADOOP-2139 (phase 1) Increase parallelism in region servers.
   HADOOP-2267 [Hbase Shell] Change the prompt's title from 'hbase' to 'hql'.
               (Edward Yoon via Stack)
   HADOOP-2139 (phase 2) Make region server more event driven
   HADOOP-2289 Useless efforts of looking for the non-existant table in select
               command.
               (Edward Yoon via Stack)
   HADOOP-2257 Show a total of all requests and regions on the web ui
               (Paul Saab via Stack)
   HADOOP-2261 HTable.abort no longer throws exception if there is no active update.
   HADOOP-2287 Make hbase unit tests take less time to complete.
   HADOOP-2262 Retry n times instead of n**2 times.
   HADOOP-1608 Relational Algrebra Operators
               (Edward Yoon via Stack)
   HADOOP-2198 HTable should have method to return table metadata
   HADOOP-2296 hbase shell: phantom columns show up from select command
   HADOOP-2297 System.exit() Handling in hbase shell jar command
               (Edward Yoon via Stack)
   HADOOP-2224 Add HTable.getRow(ROW, ts)
               (Bryan Duxbury via Stack)
   HADOOP-2339 Delete command with no WHERE clause
               (Edward Yoon via Stack)
   HADOOP-2299 Support inclusive scans (Bryan Duxbury via Stack)
   HADOOP-2333 Client side retries happen at the wrong level
   HADOOP-2357 Compaction cleanup; less deleting + prevent possible file leaks


Release 0.15.1
Branch 0.15

  INCOMPATIBLE CHANGES
    HADOOP-1931 Hbase scripts take --ARG=ARG_VALUE when should be like hadoop
                and do ---ARG ARG_VALUE

  NEW FEATURES
    HADOOP-1768 FS command using Hadoop FsShell operations
                (Edward Yoon via Stack)
    HADOOP-1784 Delete: Fix scanners and gets so they work properly in presence
                of deletes. Added a deleteAll to remove all cells equal to or
                older than passed timestamp.  Fixed compaction so deleted cells
                do not make it out into compacted output.  Ensure also that
                versions > column max are dropped compacting.
    HADOOP-1720 Addition of HQL (Hbase Query Language) support in Hbase Shell.
                The old shell syntax has been replaced by HQL, a small SQL-like
                set of operators, for creating, altering, dropping, inserting,
                deleting, and selecting, etc., data in hbase.
                (Inchul Song and Edward Yoon via Stack)
    HADOOP-1913 Build a Lucene index on an HBase table
                (Ning Li via Stack)
    HADOOP-1957 Web UI with report on cluster state and basic browsing of tables

  OPTIMIZATIONS

  BUG FIXES
    HADOOP-1527 Region server won't start because logdir exists
    HADOOP-1723 If master asks region server to shut down, by-pass return of
                shutdown message
    HADOOP-1729 Recent renaming or META tables breaks hbase shell
    HADOOP-1730 unexpected null value causes META scanner to exit (silently)
    HADOOP-1747 On a cluster, on restart, regions multiply assigned
    HADOOP-1776 Fix for sporadic compaction failures closing and moving
                compaction result
    HADOOP-1780 Regions are still being doubly assigned
    HADOOP-1797 Fix NPEs in MetaScanner constructor
    HADOOP-1799 Incorrect classpath in binary version of Hadoop
    HADOOP-1805 Region server hang on exit
    HADOOP-1785 TableInputFormat.TableRecordReader.next has a bug
                (Ning Li via Stack)
    HADOOP-1800 output should default utf8 encoding
    HADOOP-1801 When hdfs is yanked out from under hbase, hbase should go down gracefully
    HADOOP-1813 OOME makes zombie of region server
    HADOOP-1814	TestCleanRegionServerExit fails too often on Hudson
    HADOOP-1820 Regionserver creates hlogs without bound
                (reverted 2007/09/25) (Fixed 2007/09/30)
    HADOOP-1821 Replace all String.getBytes() with String.getBytes("UTF-8")
    HADOOP-1832 listTables() returns duplicate tables
    HADOOP-1834 Scanners ignore timestamp passed on creation
    HADOOP-1847 Many HBase tests do not fail well.
    HADOOP-1847 Many HBase tests do not fail well. (phase 2)
    HADOOP-1870 Once file system failure has been detected, don't check it again
                and get on with shutting down the hbase cluster.
    HADOOP-1888 NullPointerException in HMemcacheScanner (reprise)
    HADOOP-1903 Possible data loss if Exception happens between snapshot and
                flush to disk.
    HADOOP-1920 Wrapper scripts broken when hadoop in one location and hbase in
                another
    HADOOP-1923, HADOOP-1924 a) tests fail sporadically because set up and tear
                 down is inconsistent b) TestDFSAbort failed in nightly #242
    HADOOP-1929 Add hbase-default.xml to hbase jar
    HADOOP-1941 StopRowFilter throws NPE when passed null row
    HADOOP-1966 Make HBase unit tests more reliable in the Hudson environment.
    HADOOP-1975 HBase tests failing with java.lang.NumberFormatException
    HADOOP-1990 Regression test instability affects nightly and patch builds
    HADOOP-1996 TestHStoreFile fails on windows if run multiple times
    HADOOP-1937 When the master times out a region server's lease, it is too 
                aggressive in reclaiming the server's log.
    HADOOP-2004 webapp hql formatting bugs 
    HADOOP_2011 Make hbase daemon scripts take args in same order as hadoop
                daemon scripts
    HADOOP-2017 TestRegionServerAbort failure in patch build #903 and
                nightly #266
    HADOOP-2029 TestLogRolling fails too often in patch and nightlies
    HADOOP-2038 TestCleanRegionExit failed in patch build #927

  IMPROVEMENTS
    HADOOP-1737 Make HColumnDescriptor data publically members settable
    HADOOP-1746 Clean up findbugs warnings
    HADOOP-1757 Bloomfilters: single argument constructor, use enum for bloom
                filter types
    HADOOP-1760 Use new MapWritable and SortedMapWritable classes from
                org.apache.hadoop.io
    HADOOP-1793 (Phase 1) Remove TestHClient (Phase2) remove HClient.
    HADOOP-1794 Remove deprecated APIs
    HADOOP-1802 Startup scripts should wait until hdfs as cleared 'safe mode'
    HADOOP-1833 bin/stop_hbase.sh returns before it completes
                (Izaak Rubin via Stack) 
    HADOOP-1835 Updated Documentation for HBase setup/installation
                (Izaak Rubin via Stack)
    HADOOP-1868 Make default configuration more responsive
    HADOOP-1884 Remove useless debugging log messages from hbase.mapred
    HADOOP-1856 Add Jar command to hbase shell using Hadoop RunJar util
                (Edward Yoon via Stack)
    HADOOP-1928 Have master pass the regionserver the filesystem to use
    HADOOP-1789 Output formatting
    HADOOP-1960 If a region server cannot talk to the master before its lease
                times out, it should shut itself down
    HADOOP-2035 Add logo to webapps


Below are the list of changes before 2007-08-18

  1. HADOOP-1384. HBase omnibus patch. (jimk, Vuk Ercegovac, and Michael Stack)
  2. HADOOP-1402. Fix javadoc warnings in hbase contrib. (Michael Stack)
  3. HADOOP-1404. HBase command-line shutdown failing (Michael Stack)
  4. HADOOP-1397. Replace custom hbase locking with 
     java.util.concurrent.locks.ReentrantLock (Michael Stack)
  5. HADOOP-1403. HBase reliability - make master and region server more fault
     tolerant.
  6. HADOOP-1418. HBase miscellaneous: unit test for HClient, client to do
     'Performance Evaluation', etc.
  7. HADOOP-1420, HADOOP-1423. Findbugs changes, remove reference to removed 
     class HLocking.
  8. HADOOP-1424. TestHBaseCluster fails with IllegalMonitorStateException. Fix
     regression introduced by HADOOP-1397.
  9. HADOOP-1426. Make hbase scripts executable + add test classes to CLASSPATH.
 10. HADOOP-1430. HBase shutdown leaves regionservers up.
 11. HADOOP-1392. Part1: includes create/delete table; enable/disable table;
     add/remove column.
 12. HADOOP-1392. Part2: includes table compaction by merging adjacent regions
     that have shrunk in size.
 13. HADOOP-1445 Support updates across region splits and compactions
 14. HADOOP-1460 On shutdown IOException with complaint 'Cannot cancel lease
     that is not held'
 15. HADOOP-1421 Failover detection, split log files.
     For the files modified, also clean up javadoc, class, field and method 
     visibility (HADOOP-1466)
 16. HADOOP-1479 Fix NPE in HStore#get if store file only has keys < passed key.
 17. HADOOP-1476 Distributed version of 'Performance Evaluation' script
 18. HADOOP-1469 Asychronous table creation
 19. HADOOP-1415 Integrate BSD licensed bloom filter implementation.
 20. HADOOP-1465 Add cluster stop/start scripts for hbase
 21. HADOOP-1415 Provide configurable per-column bloom filters - part 2.
 22. HADOOP-1498. Replace boxed types with primitives in many places.
 23. HADOOP-1509.  Made methods/inner classes in HRegionServer and HClient protected
     instead of private for easier extension. Also made HRegion and HRegionInfo public too.
     Added an hbase-default.xml property for specifying what HRegionInterface extension to use
     for proxy server connection. (James Kennedy via Jim Kellerman)
 24. HADOOP-1534. [hbase] Memcache scanner fails if start key not present
 25. HADOOP-1537. Catch exceptions in testCleanRegionServerExit so we can see
     what is failing.
 26. HADOOP-1543 [hbase] Add HClient.tableExists
 27. HADOOP-1519 [hbase] map/reduce interface for HBase.  (Vuk Ercegovac and
     Jim Kellerman)
 28. HADOOP-1523 Hung region server waiting on write locks 
 29. HADOOP-1560 NPE in MiniHBaseCluster on Windows
 30. HADOOP-1531 Add RowFilter to HRegion.HScanner
     Adds a row filtering interface and two implemenentations: A page scanner,
     and a regex row/column-data matcher. (James Kennedy via Stack)
 31. HADOOP-1566 Key-making utility
 32. HADOOP-1415 Provide configurable per-column bloom filters. 
     HADOOP-1466 Clean up visibility and javadoc issues in HBase.
 33. HADOOP-1538 Provide capability for client specified time stamps in HBase
     HADOOP-1466 Clean up visibility and javadoc issues in HBase.
 34. HADOOP-1589 Exception handling in HBase is broken over client server connections
 35. HADOOP-1375 a simple parser for hbase (Edward Yoon via Stack)
 36. HADOOP-1600 Update license in HBase code
 37. HADOOP-1589 Exception handling in HBase is broken over client server
 38. HADOOP-1574 Concurrent creates of a table named 'X' all succeed
 39. HADOOP-1581 Un-openable tablename bug
 40. HADOOP-1607 [shell] Clear screen command (Edward Yoon via Stack)
 41. HADOOP-1614 [hbase] HClient does not protect itself from simultaneous updates
 42. HADOOP-1468 Add HBase batch update to reduce RPC overhead
 43. HADOOP-1616 Sporadic TestTable failures
 44. HADOOP-1615 Replacing thread notification-based queue with 
     java.util.concurrent.BlockingQueue in HMaster, HRegionServer
 45. HADOOP-1606 Updated implementation of RowFilterSet, RowFilterInterface
     (Izaak Rubin via Stack)
 46. HADOOP-1579 Add new WhileMatchRowFilter and StopRowFilter filters
    (Izaak Rubin via Stack)
 47. HADOOP-1637 Fix to HScanner to Support Filters, Add Filter Tests to
     TestScanner2 (Izaak Rubin via Stack)
 48. HADOOP-1516 HClient fails to readjust when ROOT or META redeployed on new
     region server
 49. HADOOP-1646 RegionServer OOME's under sustained, substantial loading by
     10 concurrent clients
 50. HADOOP-1468 Add HBase batch update to reduce RPC overhead (restrict batches
     to a single row at a time)
 51. HADOOP-1528 HClient for multiple tables (phase 1) (James Kennedy & JimK)
 52. HADOOP-1528 HClient for multiple tables (phase 2) all HBase client side code
     (except TestHClient and HBaseShell) have been converted to use the new client
     side objects (HTable/HBaseAdmin/HConnection) instead of HClient.
 53. HADOOP-1528 HClient for multiple tables - expose close table function
 54. HADOOP-1466 Clean up warnings, visibility and javadoc issues in HBase.
 55. HADOOP-1662 Make region splits faster
 56. HADOOP-1678 On region split, master should designate which host should 
     serve daughter splits. Phase 1: Master balances load for new regions and
     when a region server fails.
 57. HADOOP-1678 On region split, master should designate which host should 
     serve daughter splits. Phase 2: Master assigns children of split region
     instead of HRegionServer serving both children.
 58. HADOOP-1710 All updates should be batch updates
 59. HADOOP-1711 HTable API should use interfaces instead of concrete classes as
     method parameters and return values
 60. HADOOP-1644 Compactions should not block updates
 60. HADOOP-1672 HBase Shell should use new client classes
     (Edward Yoon via Stack).
 61. HADOOP-1709 Make HRegionInterface more like that of HTable
     HADOOP-1725 Client find of table regions should not include offlined, split parents