Tao: Can you jstack one such process next time you see them hanging ? Thanks
On Tue, Dec 17, 2013 at 6:31 PM, Tao Xiao <[email protected]> wrote: > BTW, I noticed another problem. I bulk load data into HBase every five > minutes, but I found that whenever the following command was executed > hbase org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles > HFiles-Dir MyTable > > there is a new process called "LoadIncrementalHFiles" > > I can see many processes called "LoadIncrementalHFiles" using the command > "jps" in the terminal， why are these processes still there even after the > command that bulk load HFiles into HBase has finished executing ? I have to > kill them myself. > > > 2013/12/17 Bijieshan <[email protected]> > > > Yes, it should be cleaned up. But not included in current code in my > > understanding. > > > > Jieshan. > > -----Original Message----- > > From: Ted Yu [mailto:[email protected]] > > Sent: Tuesday, December 17, 2013 10:55 AM > > To: [email protected] > > Subject: Re: Why so many unexpected files like partitions_xxxx are > created? > > > > Should bulk load task clean up partitions_xxxx upon completion ? > > > > Cheers > > > > > > On Mon, Dec 16, 2013 at 6:53 PM, Bijieshan <[email protected]> wrote: > > > > > > I think I should delete these files immediately after I have > > > > finished > > > bulk loading data into HBase since they are useless at that time, > right ? > > > > > > Ya. I think so. They are useless once bulk load task finished. > > > > > > Jieshan. > > > -----Original Message----- > > > From: Tao Xiao [mailto:[email protected]] > > > Sent: Tuesday, December 17, 2013 9:34 AM > > > To: [email protected] > > > Subject: Re: Why so many unexpected files like partitions_xxxx are > > created? > > > > > > Indeed these files are produced by org.apache.hadoop.hbase.mapreduce. > > > LoadIncrementalHFiles in the directory specified by what > > > job.getWorkingDirectory() > > > returns, and I think I should delete these files immediately after I > > > have finished bulk loading data into HBase since they are useless at > > > that time, right ? > > > > > > > > > > > > > > > 2013/12/16 Bijieshan <[email protected]> > > > > > > > The reduce partition information is stored in this partition_XXXX > file. > > > > See the below code: > > > > > > > > HFileOutputFormat#configureIncrementalLoad: > > > > ..................... > > > > Path partitionsPath = new Path(job.getWorkingDirectory(), > > > > "partitions_" + > UUID.randomUUID()); > > > > LOG.info("Writing partition information to " + partitionsPath); > > > > > > > > FileSystem fs = partitionsPath.getFileSystem(conf); > > > > writePartitions(conf, partitionsPath, startKeys); > > > > ..................... > > > > > > > > Hoping it helps. > > > > > > > > Jieshan > > > > -----Original Message----- > > > > From: Tao Xiao [mailto:[email protected]] > > > > Sent: Monday, December 16, 2013 6:48 PM > > > > To: [email protected] > > > > Subject: Why so many unexpected files like partitions_xxxx are > created? > > > > > > > > I imported data into HBase in the fashion of bulk load, but after > > > > that I found many unexpected file were created in the HDFS directory > > > > of /user/root/, and they like these: > > > > > > > > /user/root/partitions_fd74866b-6588-468d-8463-474e202db070 > > > > /user/root/partitions_fd867cd2-d9c9-48f5-9eec-185b2e57788d > > > > /user/root/partitions_fda37b8a-a882-4787-babc-8310a969f85c > > > > /user/root/partitions_fdaca2f4-2792-41f6-b7e8-61a8a5677dea > > > > /user/root/partitions_fdd55baa-3a12-493e-8844-a23ae83209c5 > > > > /user/root/partitions_fdd85a3c-9abe-45d4-a0c6-76d2bed88ea5 > > > > /user/root/partitions_fe133460-5f3f-4c6a-9fff-ff6c62410cc1 > > > > /user/root/partitions_fe29a2b0-b281-465f-8d4a-6044822d960a > > > > /user/root/partitions_fe2fa6fa-9066-484c-bc91-ec412e48d008 > > > > /user/root/partitions_fe31667b-2d5a-452e-baf7-a81982fe954a > > > > /user/root/partitions_fe3a5542-bc4d-4137-9d5e-1a0c59f72ac3 > > > > /user/root/partitions_fe6a9407-c27b-4a67-bb50-e6b9fd172bc9 > > > > /user/root/partitions_fe6f9294-f970-473c-8659-c08292c27ddd > > > > ... ... > > > > ... ... > > > > > > > > > > > > It seems that they are HFiles, but I don't know why the were created > > > here? > > > > > > > > I bulk load data into HBase in the following way: > > > > > > > > Firstly, I wrote a MapReduce program which only has map tasks. The > > map > > > > tasks read some text data and emit them in the form of RowKey and > > > > KeyValue.The following is my program: > > > > > > > > @Override > > > > protected void map(NullWritable NULL, GtpcV1SignalWritable > > > > signal, Context ctx) throws InterruptedException, IOException { > > > > String strRowkey = xxx; > > > > byte[] rowkeyBytes = Bytes.toBytes(strRowkey); > > > > > > > > rowkey.set(rowkeyBytes); > > > > > > > > part1.init(signal); > > > > part2.init(signal); > > > > > > > > KeyValue kv = new KeyValue(rowkeyBytes, Family_A, > > > > Qualifier_Q, part1.serialize()); > > > > ctx.write(rowkey, kv); > > > > > > > > kv = new KeyValue(rowkeyBytes, Family_B, Qualifier_Q, > > > > part2.serialize()); > > > > ctx.write(rowkey, kv); > > > > } > > > > > > > > > > > > after the MR programs finished, there were several HFiles generated > > > > in the output directory I specified. > > > > > > > > Then I bean to load these HFiles into HBase using the following > > command: > > > > hbase org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles > > > > HFiles-Dir MyTable > > > > > > > > Finally , I could see that the data were indeed loaded into the > > > > table in HBase. > > > > > > > > > > > > But, I could also see that there were many unexpected files > > > > generated in the HDFS directory of /user/root/, just as I have > > > > mentioned at the begining of this mail, and I did not specify any > > > > files to be produced in this directory. > > > > > > > > What happened ? Who can tell me what there files are and who > > > > produced > > > them? > > > > > > > > Thanks > > > > > > > > > >
