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Posted to issues@hbase.apache.org by "gaojinchao (Commented) (JIRA)" <ji...@apache.org> on 2011/10/20 10:58:10 UTC
[jira] [Commented] (HBASE-4578) NPE when altering a table that has
moving regions
[ https://issues.apache.org/jira/browse/HBASE-4578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131461#comment-13131461 ]
gaojinchao commented on HBASE-4578:
-----------------------------------
J-D, Do you process this issue ? Can you share the logs? If I have a free time, I want to dig it.
> 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: Blocker
> 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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