kyotoYaho commented on a change in pull request #408: KYLIN-3655 reinitialize
CubeInstance when clear segments
URL: https://github.com/apache/kylin/pull/408#discussion_r243781832
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File path: core-cube/src/main/java/org/apache/kylin/cube/CubeManager.java
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@@ -256,6 +256,23 @@ public CubeInstance createCube(CubeInstance cube, String
projectName, String own
}
}
+ /**
+ * when clear all segments, it's supposed to reinitialize the CubeInstance
+ */
+ public CubeInstance clearSegments(CubeInstance cube) throws IOException {
+ try (AutoLock lock = cubeMapLock.lockForWrite()) {
+ cube = cube.latestCopyForWrite(); // get a latest copy
+ CubeUpdate update = new CubeUpdate(cube);
+ update.setToRemoveSegs(cube.getSegments().toArray(new
CubeSegment[cube.getSegments().size()]));
+ update.setCuboids(Maps.<Long, Long> newHashMap());
+ update.setCuboidsRecommend(Sets.<Long> newHashSet());
+ update.setUpdateTableSnapshotPath(Maps.<String, String>
newHashMap());
+ update.setCreateTimeUTC(System.currentTimeMillis());
Review comment:
Now the mapping of CubeDesc & CubeInstance is one to one. It may not be
necessary to have create time UTC for CubeInstance. Here, the create time UTC
is regarded as the reinitialization time.
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