Major Description
When I restarted my hbase cluster a certain time, I noticed some regions are in FAILED_OPEN state and the RegionServers have some error logs as following:
2017-06-20 12:31:30,493 ERROR [RS_OPEN_REGION-rsync:60020-3] handler.OpenRegionHandler: Failed open of region=BIZARCH_NS_PRODUCT.BIZTRACER_SPAN,0100134e-7ddf-4d13-ab77-6f0d683e5fad_0,1487594358223.57a7be72f9beaeb4285529ac6236f4e5., starting to roll back the global memstore size.
org.apache.phoenix.hbase.index.exception.MultiIndexWriteFailureException: Failed to write to multiple index tables
at org.apache.phoenix.hbase.index.write.recovery.TrackingParallelWriterIndexCommitter.write(TrackingParallelWriterIndexCommitter.java:221)
at org.apache.phoenix.hbase.index.write.IndexWriter.write(IndexWriter.java:185)
at org.apache.phoenix.hbase.index.write.RecoveryIndexWriter.write(RecoveryIndexWriter.java:75)
at org.apache.phoenix.hbase.index.Indexer.preWALRestore(Indexer.java:554)
at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$58.call(RegionCoprocessorHost.java:1312)
at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$RegionOperation.call(RegionCoprocessorHost.java:1517)
at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.execOperation(RegionCoprocessorHost.java:1592)
at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.execOperation(RegionCoprocessorHost.java:1549)
at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.preWALRestore(RegionCoprocessorHost.java:1308)
at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEdits(HRegion.java:3338)
at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEditsIfAny(HRegion.java:3220)
at org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionStores(HRegion.java:823)
at org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionInternals(HRegion.java:716)
at org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:687)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4596)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4566)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4538)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4494)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4445)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:465)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:139)
at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:128)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
When I look the code of Index.preWALRestore method, I find RecoveryIndexWriter.write method is used to write the indexUpdates in following line 543:
526 public void preWALRestore(ObserverContext<RegionCoprocessorEnvironment> env, HRegionInfo info, 527 HLogKey logKey, WALEdit logEdit) throws IOException { 528 if (this.disabled) { 529 super.preWALRestore(env, info, logKey, logEdit); 530 return; 531 } 532 // TODO check the regions in transition. If the server on which the region lives is this one, 533 // then we should rety that write later in postOpen. 534 // we might be able to get even smarter here and pre-split the edits that are server-local 535 // into their own recovered.edits file. This then lets us do a straightforward recovery of each 536 // region (and more efficiently as we aren't writing quite as hectically from this one place). 537 538 /* 539 * Basically, we let the index regions recover for a little while long before retrying in the 540 * hopes they come up before the primary table finishes. 541 */ 542 Collection<Pair<Mutation, byte[]>> indexUpdates = extractIndexUpdate(logEdit); 543 recoveryWriter.write(indexUpdates, true); 544 }
but the RecoveryIndexWriter.write method is as following, it directly throws Exception except non-existing tables, so RecoveryIndexWriter's failurePolicy(which is StoreFailuresInCachePolicy by default) even has no opportunity to be used, and it leads to Index.failedIndexEdits which is filled by the StoreFailuresInCachePolicy is always empty.
public void write(Collection<Pair<Mutation, byte[]>> toWrite, boolean allowLocalUpdates) throws IOException { try { write(resolveTableReferences(toWrite), allowLocalUpdates); } catch (MultiIndexWriteFailureException e) { for (HTableInterfaceReference table : e.getFailedTables()) { if (!admin.tableExists(table.getTableName())) { LOG.warn("Failure due to non existing table: " + table.getTableName()); nonExistingTablesList.add(table); } else { throw e; } } } }
So the Index.postOpen method seems useless, because the updates Multimap in following 500 line which is got from Index.failedIndexEdits is always empty.
499 public void postOpen(final ObserverContext<RegionCoprocessorEnvironment> c) { 500 Multimap<HTableInterfaceReference, Mutation> updates = failedIndexEdits.getEdits(c.getEnvironment().getRegion()); 501 502 if (this.disabled) { 503 super.postOpen(c); 504 return; 505 } 506 507 //if we have no pending edits to complete, then we are done 508 if (updates == null || updates.size() == 0) { 509 return; 510 } 511 512 LOG.info("Found some outstanding index updates that didn't succeed during" 513 + " WAL replay - attempting to replay now."); 514 515 // do the usual writer stuff, killing the server again, if we can't manage to make the index 516 // writes succeed again 517 try { 518 writer.writeAndKillYourselfOnFailure(updates, true); 519 } catch (IOException e) { 520 LOG.error("During WAL replay of outstanding index updates, " 521 + "Exception is thrown instead of killing server during index writing", e); 522 } 523 }
So I think in Index.preWALRestore method, we should use RecoveryWriter.writeAndKillYourselfOnFailure method to write the indexUpdates and handle index write failure, not just use the RecoveryIndexWriter.write method.