NPE when altering a table that has moving regions
-------------------------------------------------
Key: HBASE-4578
URL: https://issues.apache.org/jira/browse/HBASE-4578
Project: HBase
Issue Type: Bug
Affects Versions: 0.92.0
Reporter: Jean-Daniel Cryans
Priority: Critical
Fix For: 0.92.0
I'm still not a 100% sure on the source of this error, but here's what I was
able to get twice while altering a table that was doing a bunch of splits:
{quote}
2011-10-11 23:48:59,344 INFO
org.apache.hadoop.hbase.master.handler.SplitRegionHandler: Handled SPLIT
report);
parent=TestTable,0002608338,1318376880454.a75d6815fdfc513fb1c8aabe086c6763.
daughter
a=TestTable,0002608338,1318376938764.ef170ff6cd8695dc8aec92e542dc9ac1.daughter
b=TestTable,0003301408,1318376938764.36eb2530341bd46888ede312c5559b5d.
2011-10-11 23:49:09,579 DEBUG
org.apache.hadoop.hbase.master.handler.TableEventHandler: Ignoring table not
disabled exception for supporting online schema changes.
2011-10-11 23:49:09,580 INFO
org.apache.hadoop.hbase.master.handler.TableEventHandler: Handling table
operation C_M_MODIFY_TABLE on table TestTable
2011-10-11 23:49:09,612 INFO org.apache.hadoop.hbase.util.FSUtils:
TableInfoPath = hdfs://sv4r11s38:9100/hbase/TestTable/.tableinfo tmpPath =
hdfs://sv4r11s38:9100/hbase/TestTable/.tmp/.tableinfo.1318376949612
2011-10-11 23:49:09,692 INFO org.apache.hadoop.hbase.util.FSUtils:
TableDescriptor stored. TableInfoPath =
hdfs://sv4r11s38:9100/hbase/TestTable/.tableinfo
2011-10-11 23:49:09,693 INFO org.apache.hadoop.hbase.util.FSUtils: Updated
tableinfo=hdfs://sv4r11s38:9100/hbase/TestTable/.tableinfo to blah
2011-10-11 23:49:09,695 INFO
org.apache.hadoop.hbase.master.handler.TableEventHandler: Bucketing regions by
region server...
2011-10-11 23:49:09,695 DEBUG org.apache.hadoop.hbase.client.MetaScanner:
Scanning .META. starting at row=TestTable,,00000000000000 for max=2147483647
rows
2011-10-11 23:49:09,709 DEBUG
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
The connection to hconnection-0x132f043bbde02e9 has been closed.
2011-10-11 23:49:09,709 ERROR org.apache.hadoop.hbase.executor.EventHandler:
Caught throwable while processing event C_M_MODIFY_TABLE
java.lang.NullPointerException
at java.util.TreeMap.getEntry(TreeMap.java:324)
at java.util.TreeMap.containsKey(TreeMap.java:209)
at
org.apache.hadoop.hbase.master.handler.TableEventHandler.reOpenAllRegions(TableEventHandler.java:114)
at
org.apache.hadoop.hbase.master.handler.TableEventHandler.process(TableEventHandler.java:90)
at
org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:168)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
{quote}
The first time the shell reported that all the regions were updated correctly,
the second time it got stuck for a while:
{quote}
6/14 regions updated.
0/14 regions updated.
...
0/14 regions updated.
2/16 regions updated.
...
2/16 regions updated.
8/9 regions updated.
...
8/9 regions updated.
{quote}
After which I killed it, redid the alter and it worked.
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