[ https://issues.apache.org/jira/browse/HBASE-9810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
chunhui shen updated HBASE-9810: -------------------------------- Description: Recently we encountered such a case in 0.94-version: Flush is triggered frequently because: {noformat}DEBUG org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Flush thread woke up because memory above low water=14.4g {noformat} But, the real global memstore size is about 1g. It seems the global memstore size has been calculated wrongly. Through the logs, I find the following root cause log: {noformat} ERROR org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler: Failed open of region=notifysub2_index,\x83\xDC^\xCD\xA3\x8A<\x E2\x8E\xE6\xAD!\xDC\xE8t\xED,1379148697072.46be7c2d71c555379278a7494df3015e., starting to roll back the global memstore size. java.lang.NegativeArraySizeException at org.apache.hadoop.hbase.KeyValue.getFamily(KeyValue.java:1096) at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEdits(HRegion.java:2933) at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEditsIfAny(HRegion.java:2811) at org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionInternals(HRegion.java:583) at org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:499) at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3939) at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3887) at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:332) at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:108) at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:169) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) {noformat} Browse the code of this part, seems a critial bug about global memstore size when replaying recovered edits. (RegionServerAccounting#clearRegionReplayEditsSize is called for each edit file, it means the roll back size is smaller than actual when calling RegionServerAccounting#rollbackRegionReplayEditsSize) Anyway, the solution is easy as the patch. was: Recently we encountered such a case in 0.94-version: Flush is triggered frequently because: {format}DEBUG org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Flush thread woke up because memory above low water=14.4g {format} But, the real global memstore size is about 1g. It seems the global memstore size has been calculated wrongly. Through the logs, I find the following root cause log: {format} ERROR org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler: Failed open of region=notifysub2_index,\x83\xDC^\xCD\xA3\x8A<\x E2\x8E\xE6\xAD!\xDC\xE8t\xED,1379148697072.46be7c2d71c555379278a7494df3015e., starting to roll back the global memstore size. java.lang.NegativeArraySizeException at org.apache.hadoop.hbase.KeyValue.getFamily(KeyValue.java:1096) at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEdits(HRegion.java:2933) at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEditsIfAny(HRegion.java:2811) at org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionInternals(HRegion.java:583) at org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:499) at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3939) at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3887) at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:332) at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:108) at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:169) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) {format} Browse the code of this part, seems a critial bug about global memstore size when replaying recovered edits. (RegionServerAccounting#clearRegionReplayEditsSize is called for each edit file, it means the roll back size is smaller than actual when calling RegionServerAccounting#rollbackRegionReplayEditsSize) Anyway, the solution is easy as the patch. > Global memstore size will be calculated wrongly if replaying recovered edits > throws exception > --------------------------------------------------------------------------------------------- > > Key: HBASE-9810 > URL: https://issues.apache.org/jira/browse/HBASE-9810 > Project: HBase > Issue Type: Bug > Reporter: chunhui shen > Assignee: chunhui shen > Priority: Critical > > Recently we encountered such a case in 0.94-version: > Flush is triggered frequently because: > {noformat}DEBUG org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Flush > thread woke up because memory above low water=14.4g > {noformat} > But, the real global memstore size is about 1g. > It seems the global memstore size has been calculated wrongly. > Through the logs, I find the following root cause log: > {noformat} > ERROR org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler: Failed > open of region=notifysub2_index,\x83\xDC^\xCD\xA3\x8A<\x > E2\x8E\xE6\xAD!\xDC\xE8t\xED,1379148697072.46be7c2d71c555379278a7494df3015e., > starting to roll back the global memstore size. > java.lang.NegativeArraySizeException > at org.apache.hadoop.hbase.KeyValue.getFamily(KeyValue.java:1096) > at > org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEdits(HRegion.java:2933) > at > org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEditsIfAny(HRegion.java:2811) > at > org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionInternals(HRegion.java:583) > at > org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:499) > at > org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3939) > at > org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3887) > at > org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:332) > at > org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:108) > at > org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:169) > at > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) > at java.lang.Thread.run(Thread.java:662) > {noformat} > Browse the code of this part, seems a critial bug about global memstore size > when replaying recovered edits. > (RegionServerAccounting#clearRegionReplayEditsSize is called for each edit > file, it means the roll back size is smaller than actual when calling > RegionServerAccounting#rollbackRegionReplayEditsSize) > Anyway, the solution is easy as the patch. -- This message was sent by Atlassian JIRA (v6.1#6144)