Creating online snapshots branch of hbase/trunk from 12/18 HBASE-7376 commit

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-7290@1445738 13f79535-47bb-0310-9956-ffa450edef68
HBASE-6765 'Take a snapshot' interface (Jesse Yates)

Add interfaces taking a snapshot. This is in hopes of cutting down on the overhead involved in reviewing snapshots.



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-7290@1445769 13f79535-47bb-0310-9956-ffa450edef68
HBASE-6571 Generic multi-thread/cross-process error handling framework (Jesse Yates)

The idea for a generic inter-process error-handling framework came
from working on HBASE-6055 (snapshots). Distributed snapshots require tight
time constraints in taking a snapshot to minimize offline time in face of
errors. However, we often need to coordinate errors between processes and
the current Abortable framework is not sufficiently flexible to handle the
multitude of situations that can occur when coordinating between all region
servers, the master and zookeeper. Using this framework error handling for
snapshots was a simple matter, amounting to maybe 200 LOC.
    
This seems to be a generally useful framework and can be used to easily add
inter-process error handling in HBase. The most obvious immediate usage is
as part of HBASE-5487 when coordinating multiple sub-tasks.



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HBASE-6353: Snapshots shell (Matteo Bertozzi)



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-7290@1445771 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7107 Snapshot References Utils (FileSystem Visitor) (Matteo Bertozzi)



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HBASE-6765 'Take a snapshot' interface - ADDENDUM: Fix snasphot -> snapshot (Matteo Bertozzi)



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HBASE-6836 Offline snapshots (Jesse Yates) 



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HBASE-6865 Snapshot File Cleaners (Jesse Yates)



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HBASE-6777 Snapshot Restore Interface (Matteo Bertozzi)


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HBASE-6230 Restore Snapshots for HBase 0.96 (Matteo Bertozzi)



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-7290@1445786 13f79535-47bb-0310-9956-ffa450edef68
HBASE-6802 Export Snapshot (Matteo Bertozzi)



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HBASE-7240 Cleanup old snapshots on start (Jesse Yates)



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HBASE-7353 [shell] have list and list_snapshot return jruby string arrays.



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-7290@1445789 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7367 Snapshot coprocessor and ACL security (Matteo Bertozzi)



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-7290@1445790 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7174 [snapshots] Refactor snapshot file cleaner cache to use Snapshot FileVisitor (Matteo Bertozzi)



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-7290@1445792 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7311 Add snapshot information to hbase master webui (Matteo Bertozzi)



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HBASE-7420 TestSnapshotExceptionSnare and TestWALReferenceTask missing test category annotation and failing TestCheckTestClasses



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HBASE-7388 Snapshot branch 12/18 rebase broke TestSnapshotFromMaster#testSnapshoHFileArchiving



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HBASE-7206 ForeignException framework v2 (simplifies and replaces HBASE-6571)



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HBASE-7430 TestSnapshotDescriptionUtils break compaction/scanner tests (EnvironmentEdge issue) (Matteo Bertozzi)



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