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HBase >> mail # user >> Scanner problem after bulk load hfile


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Rohit Kelkar 2013-07-12, 15:50
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Amit Sela 2013-07-14, 08:45
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Rohit Kelkar 2013-07-15, 04:27
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Amit Sela 2013-07-15, 14:14
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Rohit Kelkar 2013-07-16, 20:15
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Re: Scanner problem after bulk load hfile
Do you see any exception/logging in the region server side?
On Tue, Jul 16, 2013 at 1:15 PM, Rohit Kelkar <[EMAIL PROTECTED]> wrote:

> Yes. I tried everything from myTable.flushCommits() to
> myTable.clearRegionCache() before and after the
> LoadIncrementalHFiles.doBulkLoad(). But it doesn't seem to work. This is
> what I am doing right now to get things moving although I think this may
> not be the recommended approach -
>
> HBaseAdmin hbaseAdmin = new HBaseAdmin(hbaseConf);
> hbaseAdmin.majorCompact(myTableName.getBytes());
> myTable.close();
> hbaseAdmin.close();
>
> - R
>
>
> On Mon, Jul 15, 2013 at 9:14 AM, Amit Sela <[EMAIL PROTECTED]> wrote:
>
> > Well, I know it's kind of voodoo but try it once before pre-split and
> once
> > after. Worked for me.
> >
> >
> > On Mon, Jul 15, 2013 at 7:27 AM, Rohit Kelkar <[EMAIL PROTECTED]>
> > wrote:
> >
> > > Thanks Amit, I am also using 0.94.2 . I am also pre-splitting and I
> tried
> > > the table.clearRegionCache() but still doesn't work.
> > >
> > > - R
> > >
> > >
> > > On Sun, Jul 14, 2013 at 3:45 AM, Amit Sela <[EMAIL PROTECTED]>
> wrote:
> > >
> > > > If new regions are created during the bulk load (are you
> pre-splitting
> > > ?),
> > > > maybe try myTable.clearRegionCache() after the bulk load (or even
> after
> > > the
> > > > pre-splitting if you do pre-split).
> > > > This should clear the region cache. I needed to use this because I am
> > > > pre-splitting my tables for bulk load.
> > > > BTW I'm using HBase 0.94.2
> > > > Good luck!
> > > >
> > > >
> > > > On Fri, Jul 12, 2013 at 6:50 PM, Rohit Kelkar <[EMAIL PROTECTED]
> >
> > > > wrote:
> > > >
> > > > > I am having problems while scanning a table created using HFile.
> > > > > This is what I am doing -
> > > > > Once Hfile is created I use following code to bulk load
> > > > >
> > > > > LoadIncrementalHFiles loadTool = new LoadIncrementalHFiles(conf);
> > > > > HTable myTable = new HTable(conf, mytablename.getBytes());
> > > > > loadTool.doBulkLoad(new Path(outputHFileBaseDir + "/" +
> mytablename),
> > > > > mytableTable);
> > > > >
> > > > > Then scan the table using-
> > > > >
> > > > > HTable table = new HTable(conf, mytable);
> > > > > Scan scan = new Scan();
> > > > > scan.addColumn("cf".getBytes(), "q".getBytes());
> > > > > ResultScanner scanner = table.getScanner(scan);
> > > > > for (Result rr = scanner.next(); rr != null; rr = scanner.next()) {
> > > > > numRowsScanned += 1;
> > > > > }
> > > > >
> > > > > This code crashes with following error -
> > http://pastebin.com/SeKAeAST
> > > > > If I remove the scan.addColumn from the code then the code works.
> > > > >
> > > > > Similarly on the hbase shell -
> > > > > - A simple count 'mytable' in hbase shell gives the correct count.
> > > > > - A scan 'mytable' gives correct results.
> > > > > - get 'mytable', 'myrow', 'cf:q' crashes
> > > > >
> > > > > The hadoop dfs -ls /hbase/mytable shows the .tableinfo, .tmp, the
> > > > directory
> > > > > for region etc.
> > > > >
> > > > > Now if I do a major_compact 'mytable' and then execute my code with
> > the
> > > > > scan.addColumn statement then it works. Also the get 'mytable',
> > > 'myrow',
> > > > > 'cf:q' works.
> > > > >
> > > > > My question is
> > > > > What is major_compact doing to enable the scanner that the
> > > > > LoadIncrementalFiles tool is not? I am sure I am missing a step
> after
> > > the
> > > > > LoadIncrementalFiles.
> > > > >
> > > > > - R
> > > > >
> > > >
> > >
> >
>
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Rohit Kelkar 2013-07-16, 21:33
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Ted Yu 2013-07-16, 21:41
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Jimmy Xiang 2013-07-16, 21:41
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lars hofhansl 2013-07-16, 22:40
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Ted Yu 2013-07-16, 23:15
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Rohit Kelkar 2013-07-16, 23:20
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Rohit Kelkar 2013-07-16, 23:39
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lars hofhansl 2013-07-17, 00:21
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Rohit Kelkar 2013-07-16, 23:11
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Rohit Kelkar 2013-07-16, 21:53