881d2c1d74
By default, hbck is run in a read-only checker mode. In this case, it is sensible to let others run. By default, the balancer is left alone, which may cause spurious errors, but cannot leave the balancer in a bad state. It is dangerous to leave the balancer by accident, so it is only ever enabled after fixing, it will never be forced off because of racing. When hbck is run in fixer mode, it must take an exclusive lock and disable the balancer, or all havoc will break loose. If you want to stop hbck from running in parallel, the -exclusive flag will create the lock file. If you want to force -disableBalancer, that option is available too. This makes more semantic sense than -noLock and -noSwitchBalancer, respectively. Signed-off-by: Elliott Clark <eclark@apache.org>
Apache HBase [1] is an open-source, distributed, versioned, column-oriented store modeled after Google' Bigtable: A Distributed Storage System for Structured Data by Chang et al.[2] Just as Bigtable leverages the distributed data storage provided by the Google File System, HBase provides Bigtable-like capabilities on top of Apache Hadoop [3]. To get started using HBase, the full documentation for this release can be found under the doc/ directory that accompanies this README. Using a browser, open the docs/index.html to view the project home page (or browse to [1]). The hbase 'book' at http://hbase.apache.org/book.html has a 'quick start' section and is where you should being your exploration of the hbase project. The latest HBase can be downloaded from an Apache Mirror [4]. The source code can be found at [5] The HBase issue tracker is at [6] Apache HBase is made available under the Apache License, version 2.0 [7] The HBase mailing lists and archives are listed here [8]. The HBase distribution includes cryptographic software. See the export control notice here [9]. 1. http://hbase.apache.org 2. http://research.google.com/archive/bigtable.html 3. http://hadoop.apache.org 4. http://www.apache.org/dyn/closer.cgi/hbase/ 5. https://hbase.apache.org/source-repository.html 6. https://hbase.apache.org/issue-tracking.html 7. http://hbase.apache.org/license.html 8. http://hbase.apache.org/mail-lists.html 9. https://hbase.apache.org/export_control.html