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Users may want the WAL data to be written to non-HDFS data storage systems. To allow that, we have to make the WAL pluggable. The following design doc outlines the plan. https://docs.google.com/a/databricks.com/document/d/1A2XaOLRFzvIZSi18i_luNw5Rmm9j2j4AigktXxIYxmY/edit?usp=sharing Things to add. * Unit tests for WriteAheadLogUtils Author: Tathagata Das <tathagata.das1565@gmail.com> Closes #5645 from tdas/wal-pluggable and squashes the following commits: 2c431fd [Tathagata Das] Minor fixes. c2bc7384 [Tathagata Das] More changes based on PR comments. 569a416 [Tathagata Das] fixed long line bde26b1 [Tathagata Das] Renamed segment to record handle everywhere b65e155 [Tathagata Das] More changes based on PR comments. d7cd15b [Tathagata Das] Fixed test 1a32a4b [Tathagata Das] Fixed test e0d19fb [Tathagata Das] Fixed defaults 9310cbf [Tathagata Das] style fix. 86abcb1 [Tathagata Das] Refactored WriteAheadLogUtils, and consolidated all WAL related configuration into it. 84ce469 [Tathagata Das] Added unit test and fixed compilation error. bce5e75 [Tathagata Das] Fixed long lines. 837c4f5 [Tathagata Das] Merge remote-tracking branch 'apache-github/master' into wal-pluggable 754fbf8 [Tathagata Das] Added license and docs. 09bc6fe [Tathagata Das] Merge remote-tracking branch 'apache-github/master' into wal-pluggable 7dd2d4b [Tathagata Das] Added pluggable WriteAheadLog interface, and refactored all code along with it |
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