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Posted to commits@hbase.apache.org by gi...@apache.org on 2018/09/17 14:53:46 UTC
[20/40] hbase-site git commit: Published site at
6d7bc0e98b25215e79f67f107fd0d3306dfcf352.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/738e976e/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/AssignmentManager.RegionInTransitionChore.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/AssignmentManager.RegionInTransitionChore.html b/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/AssignmentManager.RegionInTransitionChore.html
index eecf20f..df4d2d2 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/AssignmentManager.RegionInTransitionChore.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/AssignmentManager.RegionInTransitionChore.html
@@ -1218,664 +1218,665 @@
<span class="sourceLineNo">1210</span> long startTime = System.nanoTime();<a name="line.1210"></a>
<span class="sourceLineNo">1211</span> LOG.debug("Joining cluster...");<a name="line.1211"></a>
<span class="sourceLineNo">1212</span><a name="line.1212"></a>
-<span class="sourceLineNo">1213</span> // Scan hbase:meta to build list of existing regions, servers, and assignment<a name="line.1213"></a>
-<span class="sourceLineNo">1214</span> // hbase:meta is online when we get to here and TableStateManager has been started.<a name="line.1214"></a>
-<span class="sourceLineNo">1215</span> loadMeta();<a name="line.1215"></a>
-<span class="sourceLineNo">1216</span><a name="line.1216"></a>
-<span class="sourceLineNo">1217</span> while (master.getServerManager().countOfRegionServers() < 1) {<a name="line.1217"></a>
-<span class="sourceLineNo">1218</span> LOG.info("Waiting for RegionServers to join; current count={}",<a name="line.1218"></a>
-<span class="sourceLineNo">1219</span> master.getServerManager().countOfRegionServers());<a name="line.1219"></a>
-<span class="sourceLineNo">1220</span> Threads.sleep(250);<a name="line.1220"></a>
-<span class="sourceLineNo">1221</span> }<a name="line.1221"></a>
-<span class="sourceLineNo">1222</span> LOG.info("Number of RegionServers={}", master.getServerManager().countOfRegionServers());<a name="line.1222"></a>
-<span class="sourceLineNo">1223</span><a name="line.1223"></a>
-<span class="sourceLineNo">1224</span> processOfflineRegions();<a name="line.1224"></a>
-<span class="sourceLineNo">1225</span><a name="line.1225"></a>
-<span class="sourceLineNo">1226</span> // Start the RIT chore<a name="line.1226"></a>
-<span class="sourceLineNo">1227</span> master.getMasterProcedureExecutor().addChore(this.ritChore);<a name="line.1227"></a>
-<span class="sourceLineNo">1228</span><a name="line.1228"></a>
-<span class="sourceLineNo">1229</span> long costMs = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startTime);<a name="line.1229"></a>
-<span class="sourceLineNo">1230</span> LOG.info("Joined the cluster in {}", StringUtils.humanTimeDiff(costMs));<a name="line.1230"></a>
-<span class="sourceLineNo">1231</span> }<a name="line.1231"></a>
-<span class="sourceLineNo">1232</span><a name="line.1232"></a>
-<span class="sourceLineNo">1233</span> // Create assign procedure for offline regions.<a name="line.1233"></a>
-<span class="sourceLineNo">1234</span> // Just follow the old processofflineServersWithOnlineRegions method. Since now we do not need to<a name="line.1234"></a>
-<span class="sourceLineNo">1235</span> // deal with dead server any more, we only deal with the regions in OFFLINE state in this method.<a name="line.1235"></a>
-<span class="sourceLineNo">1236</span> // And this is a bit strange, that for new regions, we will add it in CLOSED state instead of<a name="line.1236"></a>
-<span class="sourceLineNo">1237</span> // OFFLINE state, and usually there will be a procedure to track them. The<a name="line.1237"></a>
-<span class="sourceLineNo">1238</span> // processofflineServersWithOnlineRegions is a legacy from long ago, as things are going really<a name="line.1238"></a>
-<span class="sourceLineNo">1239</span> // different now, maybe we do not need this method any more. Need to revisit later.<a name="line.1239"></a>
-<span class="sourceLineNo">1240</span> private void processOfflineRegions() {<a name="line.1240"></a>
-<span class="sourceLineNo">1241</span> List<RegionInfo> offlineRegions = regionStates.getRegionStates().stream()<a name="line.1241"></a>
-<span class="sourceLineNo">1242</span> .filter(RegionState::isOffline).filter(s -> isTableEnabled(s.getRegion().getTable()))<a name="line.1242"></a>
-<span class="sourceLineNo">1243</span> .map(RegionState::getRegion).collect(Collectors.toList());<a name="line.1243"></a>
-<span class="sourceLineNo">1244</span> if (!offlineRegions.isEmpty()) {<a name="line.1244"></a>
-<span class="sourceLineNo">1245</span> master.getMasterProcedureExecutor().submitProcedures(<a name="line.1245"></a>
-<span class="sourceLineNo">1246</span> master.getAssignmentManager().createRoundRobinAssignProcedures(offlineRegions));<a name="line.1246"></a>
-<span class="sourceLineNo">1247</span> }<a name="line.1247"></a>
-<span class="sourceLineNo">1248</span> }<a name="line.1248"></a>
-<span class="sourceLineNo">1249</span><a name="line.1249"></a>
-<span class="sourceLineNo">1250</span> private void loadMeta() throws IOException {<a name="line.1250"></a>
-<span class="sourceLineNo">1251</span> // TODO: use a thread pool<a name="line.1251"></a>
-<span class="sourceLineNo">1252</span> regionStateStore.visitMeta(new RegionStateStore.RegionStateVisitor() {<a name="line.1252"></a>
-<span class="sourceLineNo">1253</span> @Override<a name="line.1253"></a>
-<span class="sourceLineNo">1254</span> public void visitRegionState(Result result, final RegionInfo regionInfo, final State state,<a name="line.1254"></a>
-<span class="sourceLineNo">1255</span> final ServerName regionLocation, final ServerName lastHost, final long openSeqNum) {<a name="line.1255"></a>
-<span class="sourceLineNo">1256</span> if (state == null && regionLocation == null && lastHost == null &&<a name="line.1256"></a>
-<span class="sourceLineNo">1257</span> openSeqNum == SequenceId.NO_SEQUENCE_ID) {<a name="line.1257"></a>
-<span class="sourceLineNo">1258</span> // This is a row with nothing in it.<a name="line.1258"></a>
-<span class="sourceLineNo">1259</span> LOG.warn("Skipping empty row={}", result);<a name="line.1259"></a>
-<span class="sourceLineNo">1260</span> return;<a name="line.1260"></a>
-<span class="sourceLineNo">1261</span> }<a name="line.1261"></a>
-<span class="sourceLineNo">1262</span> State localState = state;<a name="line.1262"></a>
-<span class="sourceLineNo">1263</span> if (localState == null) {<a name="line.1263"></a>
-<span class="sourceLineNo">1264</span> // No region state column data in hbase:meta table! Are I doing a rolling upgrade from<a name="line.1264"></a>
-<span class="sourceLineNo">1265</span> // hbase1 to hbase2? Am I restoring a SNAPSHOT or otherwise adding a region to hbase:meta?<a name="line.1265"></a>
-<span class="sourceLineNo">1266</span> // In any of these cases, state is empty. For now, presume OFFLINE but there are probably<a name="line.1266"></a>
-<span class="sourceLineNo">1267</span> // cases where we need to probe more to be sure this correct; TODO informed by experience.<a name="line.1267"></a>
-<span class="sourceLineNo">1268</span> LOG.info(regionInfo.getEncodedName() + " regionState=null; presuming " + State.OFFLINE);<a name="line.1268"></a>
-<span class="sourceLineNo">1269</span><a name="line.1269"></a>
-<span class="sourceLineNo">1270</span> localState = State.OFFLINE;<a name="line.1270"></a>
-<span class="sourceLineNo">1271</span> }<a name="line.1271"></a>
-<span class="sourceLineNo">1272</span> RegionStateNode regionNode = regionStates.getOrCreateRegionStateNode(regionInfo);<a name="line.1272"></a>
-<span class="sourceLineNo">1273</span> // Do not need to lock on regionNode, as we can make sure that before we finish loading<a name="line.1273"></a>
-<span class="sourceLineNo">1274</span> // meta, all the related procedures can not be executed. The only exception is formeta<a name="line.1274"></a>
-<span class="sourceLineNo">1275</span> // region related operations, but here we do not load the informations for meta region.<a name="line.1275"></a>
-<span class="sourceLineNo">1276</span> regionNode.setState(localState);<a name="line.1276"></a>
-<span class="sourceLineNo">1277</span> regionNode.setLastHost(lastHost);<a name="line.1277"></a>
-<span class="sourceLineNo">1278</span> regionNode.setRegionLocation(regionLocation);<a name="line.1278"></a>
-<span class="sourceLineNo">1279</span> regionNode.setOpenSeqNum(openSeqNum);<a name="line.1279"></a>
-<span class="sourceLineNo">1280</span><a name="line.1280"></a>
-<span class="sourceLineNo">1281</span> if (localState == State.OPEN) {<a name="line.1281"></a>
-<span class="sourceLineNo">1282</span> assert regionLocation != null : "found null region location for " + regionNode;<a name="line.1282"></a>
-<span class="sourceLineNo">1283</span> regionStates.addRegionToServer(regionNode);<a name="line.1283"></a>
-<span class="sourceLineNo">1284</span> } else if (localState == State.OFFLINE || regionInfo.isOffline()) {<a name="line.1284"></a>
-<span class="sourceLineNo">1285</span> regionStates.addToOfflineRegions(regionNode);<a name="line.1285"></a>
-<span class="sourceLineNo">1286</span> }<a name="line.1286"></a>
-<span class="sourceLineNo">1287</span> }<a name="line.1287"></a>
-<span class="sourceLineNo">1288</span> });<a name="line.1288"></a>
-<span class="sourceLineNo">1289</span><a name="line.1289"></a>
-<span class="sourceLineNo">1290</span> // every assignment is blocked until meta is loaded.<a name="line.1290"></a>
-<span class="sourceLineNo">1291</span> wakeMetaLoadedEvent();<a name="line.1291"></a>
-<span class="sourceLineNo">1292</span> }<a name="line.1292"></a>
-<span class="sourceLineNo">1293</span><a name="line.1293"></a>
-<span class="sourceLineNo">1294</span> /**<a name="line.1294"></a>
-<span class="sourceLineNo">1295</span> * Used to check if the meta loading is done.<a name="line.1295"></a>
-<span class="sourceLineNo">1296</span> * <p/><a name="line.1296"></a>
-<span class="sourceLineNo">1297</span> * if not we throw PleaseHoldException since we are rebuilding the RegionStates<a name="line.1297"></a>
-<span class="sourceLineNo">1298</span> * @param hri region to check if it is already rebuild<a name="line.1298"></a>
-<span class="sourceLineNo">1299</span> * @throws PleaseHoldException if meta has not been loaded yet<a name="line.1299"></a>
-<span class="sourceLineNo">1300</span> */<a name="line.1300"></a>
-<span class="sourceLineNo">1301</span> private void checkMetaLoaded(RegionInfo hri) throws PleaseHoldException {<a name="line.1301"></a>
-<span class="sourceLineNo">1302</span> if (!isRunning()) {<a name="line.1302"></a>
-<span class="sourceLineNo">1303</span> throw new PleaseHoldException("AssignmentManager not running");<a name="line.1303"></a>
-<span class="sourceLineNo">1304</span> }<a name="line.1304"></a>
-<span class="sourceLineNo">1305</span> boolean meta = isMetaRegion(hri);<a name="line.1305"></a>
-<span class="sourceLineNo">1306</span> boolean metaLoaded = isMetaLoaded();<a name="line.1306"></a>
-<span class="sourceLineNo">1307</span> if (!meta && !metaLoaded) {<a name="line.1307"></a>
-<span class="sourceLineNo">1308</span> throw new PleaseHoldException(<a name="line.1308"></a>
-<span class="sourceLineNo">1309</span> "Master not fully online; hbase:meta=" + meta + ", metaLoaded=" + metaLoaded);<a name="line.1309"></a>
-<span class="sourceLineNo">1310</span> }<a name="line.1310"></a>
-<span class="sourceLineNo">1311</span> }<a name="line.1311"></a>
-<span class="sourceLineNo">1312</span><a name="line.1312"></a>
-<span class="sourceLineNo">1313</span> // ============================================================================================<a name="line.1313"></a>
-<span class="sourceLineNo">1314</span> // TODO: Metrics<a name="line.1314"></a>
-<span class="sourceLineNo">1315</span> // ============================================================================================<a name="line.1315"></a>
-<span class="sourceLineNo">1316</span> public int getNumRegionsOpened() {<a name="line.1316"></a>
-<span class="sourceLineNo">1317</span> // TODO: Used by TestRegionPlacement.java and assume monotonically increasing value<a name="line.1317"></a>
-<span class="sourceLineNo">1318</span> return 0;<a name="line.1318"></a>
-<span class="sourceLineNo">1319</span> }<a name="line.1319"></a>
-<span class="sourceLineNo">1320</span><a name="line.1320"></a>
-<span class="sourceLineNo">1321</span> public void submitServerCrash(final ServerName serverName, final boolean shouldSplitWal) {<a name="line.1321"></a>
-<span class="sourceLineNo">1322</span> boolean carryingMeta = isCarryingMeta(serverName);<a name="line.1322"></a>
-<span class="sourceLineNo">1323</span> ProcedureExecutor<MasterProcedureEnv> procExec = this.master.getMasterProcedureExecutor();<a name="line.1323"></a>
-<span class="sourceLineNo">1324</span> procExec.submitProcedure(new ServerCrashProcedure(procExec.getEnvironment(), serverName,<a name="line.1324"></a>
-<span class="sourceLineNo">1325</span> shouldSplitWal, carryingMeta));<a name="line.1325"></a>
-<span class="sourceLineNo">1326</span> LOG.debug("Added=" + serverName +<a name="line.1326"></a>
-<span class="sourceLineNo">1327</span> " to dead servers, submitted shutdown handler to be executed meta=" + carryingMeta);<a name="line.1327"></a>
-<span class="sourceLineNo">1328</span> }<a name="line.1328"></a>
-<span class="sourceLineNo">1329</span><a name="line.1329"></a>
-<span class="sourceLineNo">1330</span> public void offlineRegion(final RegionInfo regionInfo) {<a name="line.1330"></a>
-<span class="sourceLineNo">1331</span> // TODO used by MasterRpcServices<a name="line.1331"></a>
-<span class="sourceLineNo">1332</span> RegionStateNode node = regionStates.getRegionStateNode(regionInfo);<a name="line.1332"></a>
-<span class="sourceLineNo">1333</span> if (node != null) {<a name="line.1333"></a>
-<span class="sourceLineNo">1334</span> node.offline();<a name="line.1334"></a>
-<span class="sourceLineNo">1335</span> }<a name="line.1335"></a>
-<span class="sourceLineNo">1336</span> }<a name="line.1336"></a>
-<span class="sourceLineNo">1337</span><a name="line.1337"></a>
-<span class="sourceLineNo">1338</span> public void onlineRegion(final RegionInfo regionInfo, final ServerName serverName) {<a name="line.1338"></a>
-<span class="sourceLineNo">1339</span> // TODO used by TestSplitTransactionOnCluster.java<a name="line.1339"></a>
-<span class="sourceLineNo">1340</span> }<a name="line.1340"></a>
-<span class="sourceLineNo">1341</span><a name="line.1341"></a>
-<span class="sourceLineNo">1342</span> public Map<ServerName, List<RegionInfo>> getSnapShotOfAssignment(<a name="line.1342"></a>
-<span class="sourceLineNo">1343</span> final Collection<RegionInfo> regions) {<a name="line.1343"></a>
-<span class="sourceLineNo">1344</span> return regionStates.getSnapShotOfAssignment(regions);<a name="line.1344"></a>
-<span class="sourceLineNo">1345</span> }<a name="line.1345"></a>
-<span class="sourceLineNo">1346</span><a name="line.1346"></a>
-<span class="sourceLineNo">1347</span> // ============================================================================================<a name="line.1347"></a>
-<span class="sourceLineNo">1348</span> // TODO: UTILS/HELPERS?<a name="line.1348"></a>
-<span class="sourceLineNo">1349</span> // ============================================================================================<a name="line.1349"></a>
-<span class="sourceLineNo">1350</span> /**<a name="line.1350"></a>
-<span class="sourceLineNo">1351</span> * Used by the client (via master) to identify if all regions have the schema updates<a name="line.1351"></a>
-<span class="sourceLineNo">1352</span> *<a name="line.1352"></a>
-<span class="sourceLineNo">1353</span> * @param tableName<a name="line.1353"></a>
-<span class="sourceLineNo">1354</span> * @return Pair indicating the status of the alter command (pending/total)<a name="line.1354"></a>
-<span class="sourceLineNo">1355</span> * @throws IOException<a name="line.1355"></a>
-<span class="sourceLineNo">1356</span> */<a name="line.1356"></a>
-<span class="sourceLineNo">1357</span> public Pair<Integer, Integer> getReopenStatus(TableName tableName) {<a name="line.1357"></a>
-<span class="sourceLineNo">1358</span> if (isTableDisabled(tableName)) return new Pair<Integer, Integer>(0, 0);<a name="line.1358"></a>
-<span class="sourceLineNo">1359</span><a name="line.1359"></a>
-<span class="sourceLineNo">1360</span> final List<RegionState> states = regionStates.getTableRegionStates(tableName);<a name="line.1360"></a>
-<span class="sourceLineNo">1361</span> int ritCount = 0;<a name="line.1361"></a>
-<span class="sourceLineNo">1362</span> for (RegionState regionState: states) {<a name="line.1362"></a>
-<span class="sourceLineNo">1363</span> if (!regionState.isOpened()) ritCount++;<a name="line.1363"></a>
-<span class="sourceLineNo">1364</span> }<a name="line.1364"></a>
-<span class="sourceLineNo">1365</span> return new Pair<Integer, Integer>(ritCount, states.size());<a name="line.1365"></a>
-<span class="sourceLineNo">1366</span> }<a name="line.1366"></a>
-<span class="sourceLineNo">1367</span><a name="line.1367"></a>
-<span class="sourceLineNo">1368</span> // ============================================================================================<a name="line.1368"></a>
-<span class="sourceLineNo">1369</span> // TODO: Region State In Transition<a name="line.1369"></a>
-<span class="sourceLineNo">1370</span> // ============================================================================================<a name="line.1370"></a>
-<span class="sourceLineNo">1371</span> public boolean hasRegionsInTransition() {<a name="line.1371"></a>
-<span class="sourceLineNo">1372</span> return regionStates.hasRegionsInTransition();<a name="line.1372"></a>
-<span class="sourceLineNo">1373</span> }<a name="line.1373"></a>
-<span class="sourceLineNo">1374</span><a name="line.1374"></a>
-<span class="sourceLineNo">1375</span> public List<RegionStateNode> getRegionsInTransition() {<a name="line.1375"></a>
-<span class="sourceLineNo">1376</span> return regionStates.getRegionsInTransition();<a name="line.1376"></a>
-<span class="sourceLineNo">1377</span> }<a name="line.1377"></a>
-<span class="sourceLineNo">1378</span><a name="line.1378"></a>
-<span class="sourceLineNo">1379</span> public List<RegionInfo> getAssignedRegions() {<a name="line.1379"></a>
-<span class="sourceLineNo">1380</span> return regionStates.getAssignedRegions();<a name="line.1380"></a>
-<span class="sourceLineNo">1381</span> }<a name="line.1381"></a>
-<span class="sourceLineNo">1382</span><a name="line.1382"></a>
-<span class="sourceLineNo">1383</span> public RegionInfo getRegionInfo(final byte[] regionName) {<a name="line.1383"></a>
-<span class="sourceLineNo">1384</span> final RegionStateNode regionState = regionStates.getRegionStateNodeFromName(regionName);<a name="line.1384"></a>
-<span class="sourceLineNo">1385</span> return regionState != null ? regionState.getRegionInfo() : null;<a name="line.1385"></a>
-<span class="sourceLineNo">1386</span> }<a name="line.1386"></a>
-<span class="sourceLineNo">1387</span><a name="line.1387"></a>
-<span class="sourceLineNo">1388</span> // ============================================================================================<a name="line.1388"></a>
-<span class="sourceLineNo">1389</span> // Expected states on region state transition.<a name="line.1389"></a>
-<span class="sourceLineNo">1390</span> // Notice that there is expected states for transiting to OPENING state, this is because SCP.<a name="line.1390"></a>
-<span class="sourceLineNo">1391</span> // See the comments in regionOpening method for more details.<a name="line.1391"></a>
-<span class="sourceLineNo">1392</span> // ============================================================================================<a name="line.1392"></a>
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-<span class="sourceLineNo">1394</span> State.OPENING, // Normal case<a name="line.1394"></a>
-<span class="sourceLineNo">1395</span> State.OPEN // Retrying<a name="line.1395"></a>
-<span class="sourceLineNo">1396</span> };<a name="line.1396"></a>
-<span class="sourceLineNo">1397</span><a name="line.1397"></a>
-<span class="sourceLineNo">1398</span> private static final State[] STATES_EXPECTED_ON_CLOSING = {<a name="line.1398"></a>
-<span class="sourceLineNo">1399</span> State.OPEN, // Normal case<a name="line.1399"></a>
-<span class="sourceLineNo">1400</span> State.CLOSING, // Retrying<a name="line.1400"></a>
-<span class="sourceLineNo">1401</span> State.SPLITTING, // Offline the split parent<a name="line.1401"></a>
-<span class="sourceLineNo">1402</span> State.MERGING // Offline the merge parents<a name="line.1402"></a>
-<span class="sourceLineNo">1403</span> };<a name="line.1403"></a>
-<span class="sourceLineNo">1404</span><a name="line.1404"></a>
-<span class="sourceLineNo">1405</span> private static final State[] STATES_EXPECTED_ON_CLOSED = {<a name="line.1405"></a>
-<span class="sourceLineNo">1406</span> State.CLOSING, // Normal case<a name="line.1406"></a>
-<span class="sourceLineNo">1407</span> State.CLOSED // Retrying<a name="line.1407"></a>
-<span class="sourceLineNo">1408</span> };<a name="line.1408"></a>
-<span class="sourceLineNo">1409</span><a name="line.1409"></a>
-<span class="sourceLineNo">1410</span> // This is for manually scheduled region assign, can add other states later if we find out other<a name="line.1410"></a>
-<span class="sourceLineNo">1411</span> // usages<a name="line.1411"></a>
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-<span class="sourceLineNo">1413</span><a name="line.1413"></a>
-<span class="sourceLineNo">1414</span> // We only allow unassign or move a region which is in OPEN state.<a name="line.1414"></a>
-<span class="sourceLineNo">1415</span> private static final State[] STATES_EXPECTED_ON_UNASSIGN_OR_MOVE = { State.OPEN };<a name="line.1415"></a>
-<span class="sourceLineNo">1416</span><a name="line.1416"></a>
-<span class="sourceLineNo">1417</span> // ============================================================================================<a name="line.1417"></a>
-<span class="sourceLineNo">1418</span> // Region Status update<a name="line.1418"></a>
-<span class="sourceLineNo">1419</span> // Should only be called in TransitRegionStateProcedure<a name="line.1419"></a>
-<span class="sourceLineNo">1420</span> // ============================================================================================<a name="line.1420"></a>
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-<span class="sourceLineNo">1422</span> RegionState.State... expectedStates) throws IOException {<a name="line.1422"></a>
-<span class="sourceLineNo">1423</span> RegionState.State state = regionNode.getState();<a name="line.1423"></a>
-<span class="sourceLineNo">1424</span> regionNode.transitionState(newState, expectedStates);<a name="line.1424"></a>
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+<span class="sourceLineNo">1226</span><a name="line.1226"></a>
+<span class="sourceLineNo">1227</span> // Start the RIT chore<a name="line.1227"></a>
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+<span class="sourceLineNo">1229</span><a name="line.1229"></a>
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+<span class="sourceLineNo">1232</span> }<a name="line.1232"></a>
+<span class="sourceLineNo">1233</span><a name="line.1233"></a>
+<span class="sourceLineNo">1234</span> // Create assign procedure for offline regions.<a name="line.1234"></a>
+<span class="sourceLineNo">1235</span> // Just follow the old processofflineServersWithOnlineRegions method. Since now we do not need to<a name="line.1235"></a>
+<span class="sourceLineNo">1236</span> // deal with dead server any more, we only deal with the regions in OFFLINE state in this method.<a name="line.1236"></a>
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+<span class="sourceLineNo">1238</span> // OFFLINE state, and usually there will be a procedure to track them. The<a name="line.1238"></a>
+<span class="sourceLineNo">1239</span> // processofflineServersWithOnlineRegions is a legacy from long ago, as things are going really<a name="line.1239"></a>
+<span class="sourceLineNo">1240</span> // different now, maybe we do not need this method any more. Need to revisit later.<a name="line.1240"></a>
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+<span class="sourceLineNo">1244</span> .map(RegionState::getRegion).collect(Collectors.toList());<a name="line.1244"></a>
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+<span class="sourceLineNo">1249</span> }<a name="line.1249"></a>
+<span class="sourceLineNo">1250</span><a name="line.1250"></a>
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+<span class="sourceLineNo">1254</span> @Override<a name="line.1254"></a>
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+<span class="sourceLineNo">1256</span> final ServerName regionLocation, final ServerName lastHost, final long openSeqNum) {<a name="line.1256"></a>
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+<span class="sourceLineNo">1259</span> // This is a row with nothing in it.<a name="line.1259"></a>
+<span class="sourceLineNo">1260</span> LOG.warn("Skipping empty row={}", result);<a name="line.1260"></a>
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+<span class="sourceLineNo">1266</span> // hbase1 to hbase2? Am I restoring a SNAPSHOT or otherwise adding a region to hbase:meta?<a name="line.1266"></a>
+<span class="sourceLineNo">1267</span> // In any of these cases, state is empty. For now, presume OFFLINE but there are probably<a name="line.1267"></a>
+<span class="sourceLineNo">1268</span> // cases where we need to probe more to be sure this correct; TODO informed by experience.<a name="line.1268"></a>
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+<span class="sourceLineNo">1271</span> localState = State.OFFLINE;<a name="line.1271"></a>
+<span class="sourceLineNo">1272</span> }<a name="line.1272"></a>
+<span class="sourceLineNo">1273</span> RegionStateNode regionNode = regionStates.getOrCreateRegionStateNode(regionInfo);<a name="line.1273"></a>
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+<span class="sourceLineNo">1275</span> // meta, all the related procedures can not be executed. The only exception is formeta<a name="line.1275"></a>
+<span class="sourceLineNo">1276</span> // region related operations, but here we do not load the informations for meta region.<a name="line.1276"></a>
+<span class="sourceLineNo">1277</span> regionNode.setState(localState);<a name="line.1277"></a>
+<span class="sourceLineNo">1278</span> regionNode.setLastHost(lastHost);<a name="line.1278"></a>
+<span class="sourceLineNo">1279</span> regionNode.setRegionLocation(regionLocation);<a name="line.1279"></a>
+<span class="sourceLineNo">1280</span> regionNode.setOpenSeqNum(openSeqNum);<a name="line.1280"></a>
+<span class="sourceLineNo">1281</span><a name="line.1281"></a>
+<span class="sourceLineNo">1282</span> if (localState == State.OPEN) {<a name="line.1282"></a>
+<span class="sourceLineNo">1283</span> assert regionLocation != null : "found null region location for " + regionNode;<a name="line.1283"></a>
+<span class="sourceLineNo">1284</span> regionStates.addRegionToServer(regionNode);<a name="line.1284"></a>
+<span class="sourceLineNo">1285</span> } else if (localState == State.OFFLINE || regionInfo.isOffline()) {<a name="line.1285"></a>
+<span class="sourceLineNo">1286</span> regionStates.addToOfflineRegions(regionNode);<a name="line.1286"></a>
+<span class="sourceLineNo">1287</span> }<a name="line.1287"></a>
+<span class="sourceLineNo">1288</span> }<a name="line.1288"></a>
+<span class="sourceLineNo">1289</span> });<a name="line.1289"></a>
+<span class="sourceLineNo">1290</span><a name="line.1290"></a>
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+<span class="sourceLineNo">1292</span> wakeMetaLoadedEvent();<a name="line.1292"></a>
+<span class="sourceLineNo">1293</span> }<a name="line.1293"></a>
+<span class="sourceLineNo">1294</span><a name="line.1294"></a>
+<span class="sourceLineNo">1295</span> /**<a name="line.1295"></a>
+<span class="sourceLineNo">1296</span> * Used to check if the meta loading is done.<a name="line.1296"></a>
+<span class="sourceLineNo">1297</span> * <p/><a name="line.1297"></a>
+<span class="sourceLineNo">1298</span> * if not we throw PleaseHoldException since we are rebuilding the RegionStates<a name="line.1298"></a>
+<span class="sourceLineNo">1299</span> * @param hri region to check if it is already rebuild<a name="line.1299"></a>
+<span class="sourceLineNo">1300</span> * @throws PleaseHoldException if meta has not been loaded yet<a name="line.1300"></a>
+<span class="sourceLineNo">1301</span> */<a name="line.1301"></a>
+<span class="sourceLineNo">1302</span> private void checkMetaLoaded(RegionInfo hri) throws PleaseHoldException {<a name="line.1302"></a>
+<span class="sourceLineNo">1303</span> if (!isRunning()) {<a name="line.1303"></a>
+<span class="sourceLineNo">1304</span> throw new PleaseHoldException("AssignmentManager not running");<a name="line.1304"></a>
+<span class="sourceLineNo">1305</span> }<a name="line.1305"></a>
+<span class="sourceLineNo">1306</span> boolean meta = isMetaRegion(hri);<a name="line.1306"></a>
+<span class="sourceLineNo">1307</span> boolean metaLoaded = isMetaLoaded();<a name="line.1307"></a>
+<span class="sourceLineNo">1308</span> if (!meta && !metaLoaded) {<a name="line.1308"></a>
+<span class="sourceLineNo">1309</span> throw new PleaseHoldException(<a name="line.1309"></a>
+<span class="sourceLineNo">1310</span> "Master not fully online; hbase:meta=" + meta + ", metaLoaded=" + metaLoaded);<a name="line.1310"></a>
+<span class="sourceLineNo">1311</span> }<a name="line.1311"></a>
+<span class="sourceLineNo">1312</span> }<a name="line.1312"></a>
+<span class="sourceLineNo">1313</span><a name="line.1313"></a>
+<span class="sourceLineNo">1314</span> // ============================================================================================<a name="line.1314"></a>
+<span class="sourceLineNo">1315</span> // TODO: Metrics<a name="line.1315"></a>
+<span class="sourceLineNo">1316</span> // ============================================================================================<a name="line.1316"></a>
+<span class="sourceLineNo">1317</span> public int getNumRegionsOpened() {<a name="line.1317"></a>
+<span class="sourceLineNo">1318</span> // TODO: Used by TestRegionPlacement.java and assume monotonically increasing value<a name="line.1318"></a>
+<span class="sourceLineNo">1319</span> return 0;<a name="line.1319"></a>
+<span class="sourceLineNo">1320</span> }<a name="line.1320"></a>
+<span class="sourceLineNo">1321</span><a name="line.1321"></a>
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+<span class="sourceLineNo">1323</span> boolean carryingMeta = isCarryingMeta(serverName);<a name="line.1323"></a>
+<span class="sourceLineNo">1324</span> ProcedureExecutor<MasterProcedureEnv> procExec = this.master.getMasterProcedureExecutor();<a name="line.1324"></a>
+<span class="sourceLineNo">1325</span> procExec.submitProcedure(new ServerCrashProcedure(procExec.getEnvironment(), serverName,<a name="line.1325"></a>
+<span class="sourceLineNo">1326</span> shouldSplitWal, carryingMeta));<a name="line.1326"></a>
+<span class="sourceLineNo">1327</span> LOG.debug("Added=" + serverName +<a name="line.1327"></a>
+<span class="sourceLineNo">1328</span> " to dead servers, submitted shutdown handler to be executed meta=" + carryingMeta);<a name="line.1328"></a>
+<span class="sourceLineNo">1329</span> }<a name="line.1329"></a>
+<span class="sourceLineNo">1330</span><a name="line.1330"></a>
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+<span class="sourceLineNo">1332</span> // TODO used by MasterRpcServices<a name="line.1332"></a>
+<span class="sourceLineNo">1333</span> RegionStateNode node = regionStates.getRegionStateNode(regionInfo);<a name="line.1333"></a>
+<span class="sourceLineNo">1334</span> if (node != null) {<a name="line.1334"></a>
+<span class="sourceLineNo">1335</span> node.offline();<a name="line.1335"></a>
+<span class="sourceLineNo">1336</span> }<a name="line.1336"></a>
+<span class="sourceLineNo">1337</span> }<a name="line.1337"></a>
+<span class="sourceLineNo">1338</span><a name="line.1338"></a>
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+<span class="sourceLineNo">1340</span> // TODO used by TestSplitTransactionOnCluster.java<a name="line.1340"></a>
+<span class="sourceLineNo">1341</span> }<a name="line.1341"></a>
+<span class="sourceLineNo">1342</span><a name="line.1342"></a>
+<span class="sourceLineNo">1343</span> public Map<ServerName, List<RegionInfo>> getSnapShotOfAssignment(<a name="line.1343"></a>
+<span class="sourceLineNo">1344</span> final Collection<RegionInfo> regions) {<a name="line.1344"></a>
+<span class="sourceLineNo">1345</span> return regionStates.getSnapShotOfAssignment(regions);<a name="line.1345"></a>
+<span class="sourceLineNo">1346</span> }<a name="line.1346"></a>
+<span class="sourceLineNo">1347</span><a name="line.1347"></a>
+<span class="sourceLineNo">1348</span> // ============================================================================================<a name="line.1348"></a>
+<span class="sourceLineNo">1349</span> // TODO: UTILS/HELPERS?<a name="line.1349"></a>
+<span class="sourceLineNo">1350</span> // ============================================================================================<a name="line.1350"></a>
+<span class="sourceLineNo">1351</span> /**<a name="line.1351"></a>
+<span class="sourceLineNo">1352</span> * Used by the client (via master) to identify if all regions have the schema updates<a name="line.1352"></a>
+<span class="sourceLineNo">1353</span> *<a name="line.1353"></a>
+<span class="sourceLineNo">1354</span> * @param tableName<a name="line.1354"></a>
+<span class="sourceLineNo">1355</span> * @return Pair indicating the status of the alter command (pending/total)<a name="line.1355"></a>
+<span class="sourceLineNo">1356</span> * @throws IOException<a name="line.1356"></a>
+<span class="sourceLineNo">1357</span> */<a name="line.1357"></a>
+<span class="sourceLineNo">1358</span> public Pair<Integer, Integer> getReopenStatus(TableName tableName) {<a name="line.1358"></a>
+<span class="sourceLineNo">1359</span> if (isTableDisabled(tableName)) return new Pair<Integer, Integer>(0, 0);<a name="line.1359"></a>
+<span class="sourceLineNo">1360</span><a name="line.1360"></a>
+<span class="sourceLineNo">1361</span> final List<RegionState> states = regionStates.getTableRegionStates(tableName);<a name="line.1361"></a>
+<span class="sourceLineNo">1362</span> int ritCount = 0;<a name="line.1362"></a>
+<span class="sourceLineNo">1363</span> for (RegionState regionState: states) {<a name="line.1363"></a>
+<span class="sourceLineNo">1364</span> if (!regionState.isOpened()) ritCount++;<a name="line.1364"></a>
+<span class="sourceLineNo">1365</span> }<a name="line.1365"></a>
+<span class="sourceLineNo">1366</span> return new Pair<Integer, Integer>(ritCount, states.size());<a name="line.1366"></a>
+<span class="sourceLineNo">1367</span> }<a name="line.1367"></a>
+<span class="sourceLineNo">1368</span><a name="line.1368"></a>
+<span class="sourceLineNo">1369</span> // ============================================================================================<a name="line.1369"></a>
+<span class="sourceLineNo">1370</span> // TODO: Region State In Transition<a name="line.1370"></a>
+<span class="sourceLineNo">1371</span> // ============================================================================================<a name="line.1371"></a>
+<span class="sourceLineNo">1372</span> public boolean hasRegionsInTransition() {<a name="line.1372"></a>
+<span class="sourceLineNo">1373</span> return regionStates.hasRegionsInTransition();<a name="line.1373"></a>
+<span class="sourceLineNo">1374</span> }<a name="line.1374"></a>
+<span class="sourceLineNo">1375</span><a name="line.1375"></a>
+<span class="sourceLineNo">1376</span> public List<RegionStateNode> getRegionsInTransition() {<a name="line.1376"></a>
+<span class="sourceLineNo">1377</span> return regionStates.getRegionsInTransition();<a name="line.1377"></a>
+<span class="sourceLineNo">1378</span> }<a name="line.1378"></a>
+<span class="sourceLineNo">1379</span><a name="line.1379"></a>
+<span class="sourceLineNo">1380</span> public List<RegionInfo> getAssignedRegions() {<a name="line.1380"></a>
+<span class="sourceLineNo">1381</span> return regionStates.getAssignedRegions();<a name="line.1381"></a>
+<span class="sourceLineNo">1382</span> }<a name="line.1382"></a>
+<span class="sourceLineNo">1383</span><a name="line.1383"></a>
+<span class="sourceLineNo">1384</span> public RegionInfo getRegionInfo(final byte[] regionName) {<a name="line.1384"></a>
+<span class="sourceLineNo">1385</span> final RegionStateNode regionState = regionStates.getRegionStateNodeFromName(regionName);<a name="line.1385"></a>
+<span class="sourceLineNo">1386</span> return regionState != null ? regionState.getRegionInfo() : null;<a name="line.1386"></a>
+<span class="sourceLineNo">1387</span> }<a name="line.1387"></a>
+<span class="sourceLineNo">1388</span><a name="line.1388"></a>
+<span class="sourceLineNo">1389</span> // ============================================================================================<a name="line.1389"></a>
+<span class="sourceLineNo">1390</span> // Expected states on region state transition.<a name="line.1390"></a>
+<span class="sourceLineNo">1391</span> // Notice that there is expected
<TRUNCATED>