In the future, provide full dump using pastebin.com
Write snippet of log in email.
Can you tell us what the following lines are about ?
HBaseURLsDaysAggregator.java:124
HBaseURLsDaysAggregator.java:131
How many mappers were launched ?
What value is used for hbase.zookeeper.property.maxClientCnxns ?
You may need to increase the value for above setting.
On Mon, Jul 4, 2011 at 9:26 AM, Lior Schachter <li...@infolinks.com> wrote:
> I used kill -3, following the thread dump:
>
> ...
>
>
> On Mon, Jul 4, 2011 at 6:22 PM, Ted Yu <yuzhih...@gmail.com> wrote:
>
> > I wasn't clear in my previous email.
> > It was not answer to why map tasks got stuck.
> > TableInputFormatBase.getSplits() is being called already.
> >
> > Can you try getting jstack of one of the map tasks before task tracker
> > kills
> > it ?
> >
> > Thanks
> >
> > On Mon, Jul 4, 2011 at 8:15 AM, Lior Schachter <li...@infolinks.com>
> > wrote:
> >
> > > 1. Currently every map gets one region. So I don't understand what
> > > difference will it make using the splits.
> > > 2. How should I use the TableInputFormatBase.getSplits() ? Could not
> find
> > > examples for that.
> > >
> > > Thanks,
> > > Lior
> > >
> > >
> > > On Mon, Jul 4, 2011 at 5:55 PM, Ted Yu <yuzhih...@gmail.com> wrote:
> > >
> > > > For #2, see TableInputFormatBase.getSplits():
> > > > * Calculates the splits that will serve as input for the map tasks.
> > The
> > > > * number of splits matches the number of regions in a table.
> > > >
> > > >
> > > > On Mon, Jul 4, 2011 at 7:37 AM, Lior Schachter <li...@infolinks.com>
> > > > wrote:
> > > >
> > > > > 1. yes - I configure my job using this line:
> > > > > TableMapReduceUtil.initTableMapperJob(HBaseConsts.URLS_TABLE_NAME,
> > > scan,
> > > > > ScanMapper.class, Text.class, MapWritable.class, job)
> > > > >
> > > > > which internally uses TableInputFormat.class
> > > > >
> > > > > 2. One split per region ? What do you mean ? How do I do that ?
> > > > >
> > > > > 3. hbase version 0.90.2
> > > > >
> > > > > 4. no exceptions. the logs are very clean.
> > > > >
> > > > >
> > > > >
> > > > > On Mon, Jul 4, 2011 at 5:22 PM, Ted Yu <yuzhih...@gmail.com>
> wrote:
> > > > >
> > > > > > Do you use TableInputFormat ?
> > > > > > To scan large number of rows, it would be better to produce one
> > Split
> > > > per
> > > > > > region.
> > > > > >
> > > > > > What HBase version do you use ?
> > > > > > Do you find any exception in master / region server logs around
> the
> > > > > moment
> > > > > > of timeout ?
> > > > > >
> > > > > > Cheers
> > > > > >
> > > > > > On Mon, Jul 4, 2011 at 4:48 AM, Lior Schachter <
> > li...@infolinks.com>
> > > > > > wrote:
> > > > > >
> > > > > > > Hi all,
> > > > > > > I'm running a scan using the M/R framework.
> > > > > > > My table contains hundreds of millions of rows and I'm scanning
> > > using
> > > > > > > start/stop key about 50 million rows.
> > > > > > >
> > > > > > > The problem is that some map tasks get stuck and the task
> manager
> > > > kills
> > > > > > > these maps after 600 seconds. When retrying the task everything
> > > works
> > > > > > fine
> > > > > > > (sometimes).
> > > > > > >
> > > > > > > To verify that the problem is in hbase (and not in the map
> code)
> > I
> > > > > > removed
> > > > > > > all the code from my map function, so it looks like this:
> > > > > > > public void map(ImmutableBytesWritable key, Result value,
> Context
> > > > > > context)
> > > > > > > throws IOException, InterruptedException {
> > > > > > > }
> > > > > > >
> > > > > > > Also, when the map got stuck on a region, I tried to scan this
> > > region
> > > > > > > (using
> > > > > > > simple scan from a Java main) and it worked fine.
> > > > > > >
> > > > > > > Any ideas ?
> > > > > > >
> > > > > > > Thanks,
> > > > > > > Lior
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
