----
                          PUBLIC DOMAIN NOTICE
             National Center for Biotechnology Information

This software/database is a "United States Government Work" under the
terms of the United States Copyright Act.  It was written as part of
the author's official duties as a United States Government employee and
thus cannot be copyrighted.  This software/database is freely available
to the public for use. The National Library of Medicine and the U.S.
Government have not placed any restriction on its use or reproduction.

Although all reasonable efforts have been taken to ensure the accuracy
and reliability of the software and data, the NLM and the U.S.
Government do not and cannot warrant the performance or results that
may be obtained by using this software or data. The NLM and the U.S.
Government disclaim all warranties, express or implied, including
warranties of performance, merchantability or fitness for any particular
purpose.

Please cite the author in any work or product based on this material.

----
# NCBI External Developer Release:


## NCBI VDB 3.2.1
**March 18, 2025**

  **fasterq-dump, kns, sratools, vdb, vfs**: fixed failure of fasterq-dump when accessing run via HTTP  
  **kdb**: fixed memory leak  


## NCBI VDB 3.2.0
**January 14, 2025**

  **align-info, prefetch, vdb, vfs**: prints an error message when unable to resolve an external reference  
  **bam-load, vdb**: the load process is terminated when background flush terminates with an error  
  **blast**: added missed include  
  **fastq-dump, kfs**: fixed infinite loop  
  **kapp, kns, sra-tools**: always use 3 part tool version in User-Agent request header  
  **kdb, kdbtext, vdb, vfs**: keep resolved KDirectory in VPath  
  **kdb, vdb-validate**: will find corruption via the MD5 sums  
  **kdb, vdb, vdb-dump**: fixed request of vdb-version on AD (Accession-as-Directory)  
  **kfs**: fixed misuse of allocator  
  **krypto**: removed external visibility of AES functions that were causing link problems  
  **ncbi-vdb, ngs-tools, sra-tools**: fixed error message asking to run configure  
  **sra**: added sequencing platform SINGULAR_GENOMICS  
  **sra-tools, vfs**: fixed resolving of WGS references in AD when not running in the same directory  
  **sra-tools, vfs**: fixed VDB version headers to always include patch version  
  **sra-tools, vfs**: simplified name resolving  
  **vdb**: fixed a use-after-free error  


## NCBI VDB 3.1.1
**May 21, 2024**

  **blast, ncbi-vdb**: fixed build on VS2022  
  **kns**: fixed segfault when SDL is not available  
  **kns, prefetch**: improved reaction to problems with data  
  **ncbi-vdb**: fixed warnings in Windows build process  
  **ncbi-vdb, sra-tools**: added build rules for BSD  
  **vdb**: generates blob CRC checksums by default  


## NCBI VDB 3.1.0
**March 5, 2024**

  **blast**: fixed VdbBlast2naReaderData() for ReferenceSet fills entire output array  
  **cloud, kns, ngs-tools, sra-tools**: don't change global network timeouts when checking cloud location  
  **kdb, kdbmeta, sra-tools**: removed confusing warning in Windows debug build   
  **kns, ngs-tools, sra-tools**: fixed hanging on Mac and BSD when data access is unreliable  


## NCBI VDB 3.0.10
**December 19, 2023**

  **cloud, ngs-tools, sra-tools**: accept AWS credentials in CSV format; warn when credentials file cannot be loaded; don't load credentials if user doesn't agree to pay  
  **cloud, ngs-tools, sra-tools**: fixed support of IMDSv2 to allow instance identity on Amazon Linux 2023  
  **kdb**: libwkdb has been merged into libkdb  
  **kns, ngs-tools, sra-tools, vfs**: print NCBI_PHID after error in names resolving to simplify troubleshooting  
  **ncbi-vdb, ngs-tools, sra-tools**: added support for Arm64  
  **ngs-tools, sra-tools, vdb, vfs**: avoids multiple calls to resolve the same accession  


## NCBI VDB 3.0.8
**September 19, 2023**

  **align, bam-load**: 'circular' can be set from configuration for fasta references  
  **test, vfs**: fixed test crash  


## NCBI VDB 3.0.7
**August 29, 2023**

  **abi-load, fastq-load, helicos-load, illumina-load, pacbio-load, sff-load, sra, srf-load**: fixed loaders to work without predefined schema  
  **align-info, prefetch, vdb, vfs**: stopped printing incorrect 'reference not found' messages; reduced number of calls to resolve WGS references; align-info don't resolve references remotely if found locally  
  **bam-load, kdb, vdb-validate**: index works correctly with only one key  
  **cloud, kns, ngs-tools, sra-tools**: added support of IMDSv2 to allow to use instance identity on new AWS machines  
  **cloud, ngs-tools, sra-tools, vdb-config**: fixed use of AWS credentials  
  **kns, ngs, ngs-tools, sra-tools**: fixed a bug that caused failure during accession resolution while reading HTTP stream  
  **vdb**: added database-contained view aliases to the schema language  


## NCBI VDB 3.0.6
**July 10, 2023**

  **cloud, sra-tools**: fixed a bug in reading chunked HTTP responses in GCP-related code  
  **schema, vdb**: upgraded the schema parser  


## NCBI VDB 3.0.5
**May 9, 2023**

  **blast**: added possibility to return filtered reads  
  **build, ncbi-vdb**: ncbi-vdb upgraded to mbedtls major version 3 to fix crypto errors on some Macs (clang 14), and ncbi-vdb will not use the system mbedtls  
  **build, ncbi-vdb**: downgraded internal mbedtls to 3.2.1 to fix MSVC 2017 build issues  
  **kfg, ngs-tools, sra-tools, vfs**: stopped using old names resolver cgi  


## NCBI VDB 3.0.2
**December 12, 2022**

  **ncbi-vdb**: changed version to match that of _sra-tools_


## NCBI VDB 3.0.1
**November 15, 2022**

  **build**: adapted to support building for Conan
  **build**: added support for generating coverage reports
  **build**: added support for overriding cmake and ctest commands
  **build**: in source builds are no longer supported
  **build**: now supports custom library installation directory
  **build**: will use a system-provided libmbedtls, otherwise the copy included in the source code will be used
  **kff**: now using system-provided libmagic if present
  **kfg**: fixed a bug that caused override of user configuration
  **kfg, ncbi-vdb**: fixed tests that overwrite user configuration
  **kfg, sra-tools**: removed interactive requirement to configure SRA Toolkit
  **kfs**: fixed bug with long paths
  **kns, sra-tools**: allow to use AWS data with compute environment via proxy
  **ncbi-vdb**: fixed crash related to mbedtls
  **ncbi-vdb**: fixed failing tests related to sralite
  **pacbio-load, vdb**: hdf5 support is now a part of sra-tools/pacbio-load; uses system-provided libhdf5
  **sra-pileup, vfs**: fixed crash when working with no-quality run
  **sra-tools, vdb**: retired vdb-get
  **sra-tools, vfs**: fixed infinite loop when processing bad response when resolving accession
  **vdb**: fixed a bug that allowed a null pointer to be used
  **vdb**: kxml and kxfs are combined and moved to sra-tools
  **vdb**: memmove should be used instead of memcpy in this repository. We added an automated check for that. New code containing memcpy will fail this check
  **vdb**: updated zlib version to fix vulnerability
  **vdb**: VTable can copy columns
  **vfs**: now recognizes sralite.vdbcache files


## NCBI VDB 3.0.0
**February 10, 2022**

  **blast**: processes some unusual ILLUMINA runs
  **blast, test**: fixed a missed return
  **build, ncbi-vdb**: see https://github.com/ncbi/ncbi-vdb/wiki/Building-and-Installing-from-Source for updated build instructions
  **build, ncbi-vdb, sra-tools**: added support for building with XCode
  **build, ncbi-vdb, sra-tools**: the build system has been converted to use CMake
  **klib**: removed asserts from RC headers
  **klib**: result codes can be more easily converted to strings
  **kns**: environment variables NCBI_USAGE_PLATFORM_NAME and NCBI_USAGE_PLATFORM_VERSION are sent to NCBI
  **kns, test**: test was improved
  **kfs, sra-tools**: fixed a bug in handling of long URLs on Windows


## NCBI VDB 2.11.2
**October 7, 2021**

  **klib, ngs-tools, sra-tools**: status messages (-v) are printed to stderr rather than stdout
  **kns, ngs-tools, sra-tools**: old verbose messages now happen at verbosity > 1
  **ncbi-vdb, ngs-tools, sra-tools, vdb, vfs**: added  support of SRA Lite files with simplified base quality scores
  **prefetch, vfs**: accept Percent Encoding in source URLs
  **sra-tools, vdb**: environment variable NCBI_TMP_CACHE sets the caching directory, overriding any other setting


## NCBI VDB 2.11.1
**August 17, 2021**

  **align, axf, sra-pileup, vdb, vfs**: resolve reference sequences within output directory
  **cloud, kns, sra-tools**: do not acquire CE more often than necessary
  **kapp, kns**: fixed a crash that occurred when multiple threads update HTTP's User-Agent header
  **kfg**: improved thread safety
  **kns**: fixed test failure on GCP
  **kns**: improved reporting of peer certificate information
  **kns**: improved thread safety when proxy is used
  **kns**: improved timeout management in CacheTeeFile
  **kns**: integrated mutual TLS authentication
  **ncbi-vdb**: added dependency on cmake
  **ncbi-vdb, ngs, ngs-tools, sra-tools**: configure prints the version of compiler
  **prefetch, vdb, vfs**: prefetch with "-O" will now correctly place references in output directory
  **prefetch, vfs**: fixed error message 'multiple response SRR URLs for the same service...' when downloading
  **vdb**: support for Zstd added to the schema
  **vfs**: updated interaction with SRA Data Locator


## NCBI VDB 2.11.0
**March 15, 2021**

  **build, ncbi-vdb, ngs, ngs-tools**: introduced an additional external library, libncbi-ngs
  **kfg, prefetch, vfs**: resolve WGS reference sequences into "Accession Directory"
  **kfg, sra-tools, vfs**: dropped support of protected repositories
  **kns, sra-tools**: fixed formatting of HTTP requests for proxy
  **ktst**: improved thread safety
  **ncbi-vdb, ngs, ngs-tools, sra-tools, vdb**: added support for 64-bit ARM (AArch64, Apple Silicon)
  **prefetch, vfs**: fixed download of protected non-run files
  **prefetch, vfs**: fixed segfault during download of JWT cart
  **prefetch, vfs**: respect requested version when downloading WGS files
  **sra-tools, vfs**: recognize sra file names with version


## NCBI VDB 2.10.9
**December 16, 2020**

  **align**: alignment enumerator structure is now fully initialized
  **align, vdb**: fixed situation where network access could drastically slow down reading references
  **build**: added configure option to produce build in output directory relative to sources
  **cloud**: implemented using OAuth 2.0 to access GCP buckets
  **kfs**: added support of hard links
  **kfs, kns**: improved timeout management in CacheTeeFile
  **kns**: env_token and pay_required flags are now treated independently
  **kns**: memory leak was fixed
  **kns**: removed memory leaks in KNS, VDB, VFS
  **kns, sra-tools, vdb**: added a loop to retry failed connections when fetching SRA files
  **test**: updated test not to fail when the source is not available
  **vdb**: writing a big (>3MB) cell now triggers a page commit
  **vfs**: allow to find local files when remote repository is disabled
  **vfs**: not to call names.cgi but SDL when resolving runs and reference sequences
  **vfs**: support of ETL - BQS runs


## NCBI VDB 2.10.8
**June 29, 2020**

  **kproc, fasterq-dump**: fixed problem with seg-faults caused by too small stack used by threads
  **kdb, vdb, vfs, sra-tools**: fixed bug preventing use of path to directory created by prefetch if it ends with '/'
  **vfs, sra-tools, ngs-tools**: report an error when file was encrypted for a different ngc file
  **vfs, prefetch**: download encrypted phenotype files with encrypted extension
  **vdb, sra-docker**: config can auto-generate LIBS/GUID when in a docker container


## NCBI VDB 2.10.7
**May 21, 2020**

  **kns, ngs-tools, sra-tools**: added new header to HTTP requests to communicate VDB version


## NCBI VDB 2.10.6
**May 15, 2020**

  **align, sra-tools**: fixed fetching of reference sequences from cloud
  **align, sra-tools, vfs**: fixed resolving of hs37d5 reference sequence
  **axf**: fixed invalid soft clips with hard clipped secondary alignments
  **kfg, sra-tools**: ignore configuration with invalid protected user repository having a single 'root' node
  **kns, sra-tools**: added new header to HTTP requests to communicate SRA version
  **kns, sra-tools**: close socket when accessing GCP files
  **kns, sra-tools**: introduced a additional configurable network retry loop
  **kns**: Windows connect() is now asynchronous and supporting timeouts
  **krypto, sra-tools, vfs**: fixed decryption when password contains # symbol
  **sratools, vdb-dump, vfs**: fixed vdb-dump <accession of prefetched run>
  **sra-tools, vdb**: restored possibility to cache WGS references to user repository
  **sra-tools, vfs**: fixed working with runs having WGS reference sequences
  **sraxf**: synthetic qualities are now generated per read
  **sraxf**: synthetic qualities are now generated per read
  **vdb**: fixed segfault in VSchemaDumpToKMDataNode
  **vfs**: added possibility to control the verbosity of negative response of names service


## NCBI VDB 2.10.5
**April 1, 2020**

  **build**: the Windows build now uses MS Visual Studio 2017
  **cloud**: cloud-specific test projects have been ported to Windows
  **cloud**: SRA Tools now filter out cases when internet providers successfully resolve not found DNS entries
  **kfg**: AWS credential files are not opened without user permission
  **kns**: Internet socket connections are now blocking on Windows
  **kns**: KTimeMakeTime() on Windows now returns UTC, not local time
  **kns**: SRA Tools were updated to not hang on HTTP calls when the server doesn't return Content-Length in GET requests without a range
  **kns**: use of root CA certificates is now supported on Windows
  **ncbi-vdb, ngs, ngs-tools, sra-tools**: all Linux builds now use g++ 7.3 (C++11 ABI)
  **vdb**: fixed some POSIX header include issues


## NCBI VDB 2.10.4
**February 26, 2020**

  **kns**: fixed errors when using ngc file


## NCBI VDB 2.10.3
**February 18, 2020**

  **sraxf**: fixed a problem resulting in a segmentation fault


## NCBI VDB 2.10.2
**January 15, 2020**

  **build**: install used to fail on OSX when checking md5
  **kfg**: Users now provide the ngc access token on the command line
  **kfg**: potential memory leak removed
  **kfg, vdb-config, vfs**: new names for caching dbGaP files
  **kfg, vfs**: added new configuration node for resolving protected data
  **klib**: fixed incorrect access to memory in output writers
  **kns**: KNS now provides limited support for attaching files to HTTP POST requests
  **kns, vfs**: added support of ngc files and JWT-carts in SDL requests
  **krypto**: fixed decryption of dbGaP data on the fly
  **vfs**: allow to set dbGaP context by ngc file
  **vfs**: fixed detection of cache location of public runs on cloud
  **vfs**: fixed double-free when processing names service response
  **vfs**: fixed names conflict
  **vfs**: new naming scheme for caching dbGaP files


## NCBI VDB 2.10.1
**December 16, 2019**

  **vfs**: fixed generation of unique file name when caching


## NCBI VDB 2.10.0
**August 19, 2019**

  **cloud**: added support for user-pays access to GCP
  **cloud**: cloud-related code was moved to new module
  **cloud, vfs**: send cloud instance identity just when user allows it
  **kfg, sra-tools**: use trace.ncbi.nlm.nih.gov to call names service
  **kfg, vdb-config**: alternative remote repository URL was added to default configuration
  **kfs**: introduced readahead strategy for cloud storage
  **klib, vdb**: error report is saved to ncbi_error_report.txt
  **kns**: Don't log mdebtls error messages. Added possibility to enable them.
  **kns**: We now use system root CA certs on Unix
  **kns**: increased default value of HTTP read to 5 minutes; made it configurable
  **kns**: introduced configurable controls over network timeouts
  **kns**: special support for handling SDL interaction
  **prefetch, vdb**: adjustments for latest name resolution service
  **prefetch, vfs**: added support of "run accession as directory"
  **prefetch, vfs**: added support of download of reference sequences in "run accession as directory"
  **prefetch, vfs**: fixed regression when prefetch does not download vdbcache
  **sratools**: VDB can get URLs- for local/remote/cache locations of accession from environment
  **tui, vdb-config**: new look and cloud specific options in 'vdb-config -i'
  **vdb**: VDBManagerMakeSRASchema() was deprecated
  **vdb**: make greater use of data returned by latest name resolver
  **vfs**: added possibility to have multiple remote repositories for backward compatibility
  **vfs**: added possibility to set resolver version from configuration
  **vfs**: allow to use SDL as remote service


## NCBI VDB 2.9.6
**March 18, 2019**

  **prefetch, **vfs**: fixed regression that prevented re-download of incomplete files


## NCBI VDB 2.9.4-1
**March 4, 2019**

  **sra-tools, **vfs**: fixed regression introduced in 2.9.4 release causing delay when starting sra tools


## NCBI VDB 2.9.4
**January 31, 2019**

  **kns**: added detection of zone where cloud instance runs
  **kns**: added support of AWS authentication
  **kns**: allow to access googleapis.com via proxy
  **kns**: don't add "Accept: */*" request header when it already contains an Accept header
  **kns**: updated mbedtls to version 2.16
  **sra-tools, vfs**: added support of realign objects
  **vdb**: A Json parser is now available in klib


## NCBI VDB 2.9.3
**October 11, 2018**

  **kns**: added possibility to skip server's certificate validation
  **kns**: expect to receive HTTP status 200 when sending range-request that includes the whole file
  **vdb**: fixed a bug in accessing pagemap process request for cursors which do not have pagemap thread running


## NCBI VDB 2.9.2-1
**July 31, 2018**

  **vdb**: restored lost exported attribute on several entries in the private API


## NCBI VDB 2.9.2
**July 23, 2018**

  **kfg, vfs**: Introduced enhanced handling of download-only NGC files that lack read/decrypt permissions


## NCBI VDB 2.9.1-1
**June 25, 2018**

  **ncbi-vdb**: fixed break of binary compatibility introduced in release 2.9.1


## NCBI VDB 2.9.1
**June 15, 2018**

  **build**: 'make install' ignore ROOT environment variable
  **kfg, kns**: Added API to instruct VDB to silently accept any server certificate as valid.
  **kfg, vdb-config**: name resolver service now makes use of fcgi
  **kfg, vfs**: Fixed a bug that prevented decryption of objects encrypted with non-UTF8 text password keys
  **klib**: added check for NULL format argument to string_printf()
  **kns**: Randomly select from multiple proxies in configuration
  **test**: added Windows test projects for the new schema and the latest vdb


## NCBI VDB 2.9.0
**February 23, 2018**

  **align**: AlignAccessRefSeqEnumeratorNext no longer filters by the index
  **align**: fixed an order-dependent bug affecting cross-table lookups
  **build**: Created a script that allows to add a new volume to existing repository
  **build**: Fixed configure allowing to run it on Perl with version >= v5.26 that has "." removed from @INC
  **build**: added "smoke tests"
  **build**: recognize version of libhdf5 that does not allow static linking and do not try to use it
  **build, doc**: added wiki page: Building-from-source-:--configure-options-explained
  **build, ncbi-vdb, sra-tools**: the installation script now saves configuration files if they were modified by the user
  **build, vdb-sql**: modified build to avoid vdb-sql in absence of libxml2
  **kfg**: added searching of configuration files in ../etc/ncbi/ relative to the binaries
  **kfg, prefetch**: set limit of Aspera usage to 450m
  **kfg, prefetch, remote-fuser, vfs**: Updated resolving of cache location of non-accession objects
  **kfs**: fix to improve on windows
  **klib**: Reverted KTimeMakeTime to use UTC
  **kns**: Accept the same http_proxy specifications as wget
  **kns**: Added possibility to report server's IP address after network error
  **kns**: Ignore HTTP headers sent multiple times
  **kns**: Improved reporting of network errors
  **kns**: fixed generation of invalid error code in response to dropped connection
  **ncbi-vdb**: add ability to make a cache-tee-file without promtion
  **ncbi-vdb**: fixed bug of directory not found on mac
  **ncbi-vdb, ngs-engine**: improved handling of blobs inside the NGS engine
  **ngs-engine**: improved performance when iterating through partially aligned and unaligned reads
  **ngs-engine**: optimized filtered access to unaligned runs
  **sra-tools, vdb**: access to vdb/ngs via SQLite
  **vdb**: An assert triggered by a rare condition was fixed
  **vdb**: new api to estimate pileup-workload based on slice
  **vdb**: new function to open HTTP-file with an arbitrary page-size
  **vdb**: progressbar can now be created to output on stderr
  **vfs**: Name resolving service was updated and switched to protocol version 3.0


## NCBI VDB 2.8.2
**March 6, 2017**

  **blast**: Updated blast library to be able to process runs having empty rows
  **build**: Added ability to specify ncbi-vdb/configure --with-magic-prefix. Look for libraries in (lib lib64) when running "configure --with-...-prefix"
  **build**: configure detects location of ngs libraries
  **build**: configure was fixed to skip options unrecognized by gcc 4.4.7
  **build**: created sra-toolkit Debian package
  **build**: fixed a bug in 'configure' when in could not find source files in repository saved with non-standard name
  **build, kfg**: install updates certs.kfg along with other configuration files
  **build, ncbi-vdb, sra-tools**: installation will back up old configuration files if they differ from the ones being installed
  **kfs, vdb**: Fixes errors occuring when configuration is missing
  **klib**: Fixed logging error reported as "log failure: RC(rcText,rcString,rcConverting,rcBuffer,rcInsufficient)"
  **kns**: SRA tools respect standard set of environment variables for proxy specification
  **kns**: rewrote socket code to use proper local error code switches, especially Windows
  **kns**: updated mbedtls library to version 2.4.1
  **ncbi-vdb**: configure in detects existence of ngs jar file
  **ncbi-vdb, ngs, ngs-tools, sra-tools**: eliminated memcpy from sources due to potential for overlap
  **test**: Improved testing framework
  **vdb**: increased tenacity in flushing data to disk to accommodate behaviors of file systems such as Lustre.
  **vdb-blast**: Implemented vdb-blast API for retrieving reference sequence


## NCBI VDB 2.8.1
**December 22, 2016**

  **kfg**: added possibility to create an empty KConfig object that does not try to load any file


## NCBI VDB 2.8.0
**October 7, 2016**

### HTTPS-ENABLED RELEASE

  **kfg, kns**: Use environment variables to determine the proxy for a http protocol
  **kfg, vdb-config**: vdb-config-GUI has now option to pick up proxy-setting from environment
  **kns**: All tools and libraries now support https
  **kns**: replaced all direct uses of sleep() within code to enforce standardization upon mS.
  **kproc, ncbi-vdb**: Fixed KCondition to generate timeout error on Windows when timeout exhausted
  **ngs-engine**: improved diagnostic messages
  **test**: updated tests to not fail outside of NCBI
  **test-sra**: test-sra prints network information
  **test-sra**: test-sra prints version of ncbi-vdb or ngs-sdk dynamic library
  **vdb**: improved parameter checking on VDatabaseOpenTableRead()
  **vdb**: new function: "VDBManagerDeleteCacheOlderThan()"
  **vdb**: problem with buffer-overrun when compressing random data fixed
  **vdb**: remote/aux nodes have been removed from configuration


## NCBI VDB 2.7.0
**July 12, 2016**

  **blast, kfg, ncbi-vdb, sra-tools, vfs**: restored possibility to disable local caching
  **doc, ncbi-vdb**: created a Wiki page illustrating how to use the API to set up logging
  **kdb, kfs, kns**: Added blob validation for data being fetched remotely
  **kfg**: When loading configuration files on Windows USERPROFILE environment variable is used before HOME
  **kfg**: modified auxiliary remote access configuration to use load-balanced servers
  **kns**: Fixed a bug when KHttpRequestPOST generated an incorrect Content-Length after retry
  **ngs, search, sra-search**: sra-search was modified to support multiple threads.
  **ngs-engine, ngs-tools, sra-tools, vfs**: The "auxiliary" nodes in configuration are now ignored
  **ngs-engine**: Added support for blob-by-blob access to SEQUENCE table
  **ngs-engine**: removed a potential memory leak in NGS_CursorMake()
  **search**: now supports multi-threaded search
  **vdb**: fixed a bug in VCursorFindNextRowIdDirect where it returned a wrong rowId
  **vdb**: fixed a bug in the code used to iterate over blobs where rowmap expansion cache would reset iteration to initial row instead of respecting sequence
  **vfs**: environment variable VDB_PWFILE is no longer used


## NCBI VDB 2.6.3
**May 25, 2016**

  **vdb**: Fixed a bound on memory cache that would never flush under certain access modes

## NCBI VDB 2.6.2
**April 20, 2016**

  **kdb**: Fixed VTableDropColumn, so that it can drop static columns
  **kfs, kns**: Fixed thread safety issues for both cache and http files
  **kproc**: Fixed KQueue to wake waiters when sealed, fixed KSemaphore to wake waiters when canceled
