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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3661) Handle empty qualifier better in shell for increments
Date Thu, 17 Mar 2011 12:37:29 GMT
Handle empty qualifier better in shell for increments
-----------------------------------------------------

                 Key: HBASE-3661
                 URL: https://issues.apache.org/jira/browse/HBASE-3661
             Project: HBase
          Issue Type: Improvement
          Components: shell
    Affects Versions: 0.92.0
            Reporter: Lars George
            Priority: Minor
             Fix For: 0.92.0


When trying to increment a counter using the examples, which specify no *explicit* qualifier
you get an error:

{code}
hbase(main):014:0> incr 'testtable', 'cnt1', 'colfam1', 1

ERROR: org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to contact region
server 10.0.0.57:51640 for region testtable,,1300267113942.cd2e7925140eb414d519621e384fb654.,
row 'cnt1', but failed after 7 attempts.
Exceptions:
java.io.IOException: java.io.IOException: java.lang.NullPointerException
        at org.apache.hadoop.hbase.regionserver.ColumnCount.<init>(ColumnCount.java:47)
        at org.apache.hadoop.hbase.regionserver.ExplicitColumnTracker.<init>(ExplicitColumnTracker.java:69)
        at org.apache.hadoop.hbase.regionserver.ScanQueryMatcher.<init>(ScanQueryMatcher.java:93)
        at org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:65)
        at org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:1436)
        at org.apache.hadoop.hbase.regionserver.HRegion$RegionScanner.<init>(HRegion.java:2412)
        at org.apache.hadoop.hbase.regionserver.HRegion.instantiateInternalScanner(HRegion.java:1185)
        at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1171)
        at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1155)
        at org.apache.hadoop.hbase.regionserver.HRegion.getLastIncrement(HRegion.java:3087)
        at org.apache.hadoop.hbase.regionserver.HRegion.incrementColumnValue(HRegion.java:3312)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.incrementColumnValue(HRegionServer.java:2570)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:309)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1060)

Here is some help for this command:
Increments a cell 'value' at specified table/row/column coordinates.
To increment a cell value in table 't1' at row 'r1' under column
'c1' by 1 (can be omitted) or 10 do:

  hbase> incr 't1', 'r1', 'c1'
  hbase> incr 't1', 'r1', 'c1', 1
  hbase> incr 't1', 'r1', 'c1', 10
{code}

Handle this more gracefully (printing 5 stacktraces is ugly), improve the help to specify
what is needed more clearly. Or fix the server side to support this, if this makes sense,
and therefore never triggering this issue.

Adding a qualifier makes it work:

{code}
hbase(main):015:0> incr 'testtable', 'cnt1', 'colfam1:test', 1
COUNTER VALUE = 1

hbase(main):016:0> incr 'testtable', 'cnt1', 'colfam1:test', 1
COUNTER VALUE = 2
{code} 

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