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https://issues.apache.org/jira/browse/HADOOP-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HADOOP-1730:
--------------------------
Attachment: nullsplit.patch
Here's a fix.
{code}
HADOOP-1730 unexpected null value causes META scanner to exit (silently)
Added handling for legal null value scanning META table and added
logging of unexpected exceptions that arise scanning.
M src/contrib/hbase/src/test/org/apache/hadoop/hbase/TestSplit.java
Refactored to do a staged removal of daughter references.
(compact, recalibrate): Added.
(getSplitParent): Refactored as getSplitParentInfo.
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/HConnectionManager.java
Added formatting of the find table result string so shorter
(when 30-odd regions fills page with its output).
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/HTable.java
Formatting to clean eclipse warnings.
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/HMaster.java
The split column in a parent meta table entry can be null (Happens
if a daughter split no longer has references -- it removes its
entry from parent). Add handling and clean up around split
management code. Added logging of unexpected exceptions
scanning a region.
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegion.java
Added fix for NPE when client asks for scanner but passes
non-existent columns.
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/util/Writables.java
(getHRegionInfo, getHRegionInfoOrNull): Added.
{code}
> [hbase] unexpected null value causes META scanner to exit (silently)
> --------------------------------------------------------------------
>
> Key: HADOOP-1730
> URL: https://issues.apache.org/jira/browse/HADOOP-1730
> Project: Hadoop
> Issue Type: Bug
> Components: contrib/hbase
> Reporter: stack
> Assignee: stack
> Attachments: nullsplit.patch
>
>
> META scanner exits silently if a cell value is unexpectedly empty.
> At least the out log had this:
> {code}
> Exception in thread "HMaster.metaScanner" java.lang.IllegalArgumentException:
> Can't build a writable with empty bytes array
> at org.apache.hadoop.hbase.util.Writables.getWritable(Writables.java:77)
> at
> org.apache.hadoop.hbase.HMaster$BaseScanner.scanRegion(HMaster.java:267)
> at
> org.apache.hadoop.hbase.HMaster$MetaScanner.scanOneMetaRegion(HMaster.java:597)
> at
> org.apache.hadoop.hbase.HMaster$MetaScanner.maintenanceScan(HMaster.java:654)
> at org.apache.hadoop.hbase.HMaster$BaseScanner.run(HMaster.java:172)
> at java.lang.Thread.run(Thread.java:619)
> {code}
> Need to add at a minimum logging of meta scanner exits with the why.
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