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From Ted Yu <yuzhih...@gmail.com>
Subject Re: HDFS datanode used space is increasing without any writes
Date Sun, 09 Aug 2015 13:46:37 GMT
From log below, hbase-rs4 was writing to the datanode. 

Can you take a look at region server log and see if there is some clue ?

Thanks 



> On Jul 28, 2015, at 9:41 AM, Akmal Abbasov <akmal.abbasov@icloud.com> wrote:
> 
> Hi, I’m observing strange behaviour in HDFS/HBase cluster.
> The disk space of one of datanodes is increasing very fast even when there are no write
requests. 
> It is 8GB per hour in average. Here is the graph which shows it.
> <screenshot.png>
> I am using hbase-0.98.7-hadoop2 and hadoop-2.5.1.
> 
> And this is logs from the node
> 2015-07-28 15:40:38,795 INFO org.apache.hadoop.hdfs.server.datanode.DataNode.clienttrace:
src: /10.32.1.12:50010, dest: /10.32.0.140:38699, bytes: 1071, op: HDFS_READ, cliID: DFSClient_NONMAPREDUCE_-689748537_1,
offset: 0, srvID: 6c25ffd4-3dc7-4e3a-af56-5cc8aa9220e0, blockid: BP-439084760-10.32.0.180-1387281790961:blk_1074784244_1045663,
duration: 17759797
> 2015-07-28 15:41:15,111 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Receiving
BP-439084760-10.32.0.180-1387281790961:blk_1075311714_1574450 src: /10.0.0.21:60540 dest:
/10.32.1.12:50010
> 2015-07-28 15:41:15,304 INFO org.apache.hadoop.hdfs.server.datanode.DataNode.clienttrace:
src: /10.0.0.21:59054, dest: /10.32.1.12:50010, bytes: 124121, op: HDFS_WRITE, cliID: DFSClient_hb_rs_hbase-rs4,60020,1438094355024_530940245_35,
offset: 0, srvID: 6c25ffd4-3dc7-4e3a-af56-5cc8aa9220e0, blockid: BP-439084760-10.32.0.180-1387281790961:blk_1075311536_1574238,
duration: 3600203675041
> 2015-07-28 15:41:15,304 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: PacketResponder:
BP-439084760-10.32.0.180-1387281790961:blk_1075311536_1574238, type=HAS_DOWNSTREAM_IN_PIPELINE
terminating
> 2015-07-28 15:50:40,745 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Slow BlockReceiver
write data to disk cost:6099ms (threshold=300ms)
> 2015-07-28 15:59:21,130 INFO org.apache.hadoop.hdfs.server.datanode.DirectoryScanner:
BlockPool BP-439084760-10.32.0.180-1387281790961 Total blocks: 65856, missing metadata files:0,
missing block files:0, missing blocks in memory:0, mismatched blocks:0
> 2015-07-28 16:00:16,770 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Receiving
BP-439084760-10.32.0.180-1387281790961:blk_1075311715_1574451 src: /10.32.1.12:36998 dest:
/10.32.1.12:50010
> 2015-07-28 16:00:17,469 INFO org.apache.hadoop.hdfs.server.datanode.DataNode.clienttrace:
src: /10.32.1.12:36150, dest: /10.32.1.12:50010, bytes: 32688, op: HDFS_WRITE, cliID: DFSClient_hb_rs_hbase-rs5,60020,1438088401479_1146354759_35,
offset: 0, srvID: 6c25ffd4-3dc7-4e3a-af56-5cc8aa9220e0, blockid: BP-439084760-10.32.0.180-1387281790961:blk_1075311706_1574442,
duration: 3601152263901
> 2015-07-28 16:00:17,472 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: PacketResponder:
BP-439084760-10.32.0.180-1387281790961:blk_1075311706_1574442, type=HAS_DOWNSTREAM_IN_PIPELINE
terminating
> 2015-07-28 16:03:44,011 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Receiving
BP-439084760-10.32.0.180-1387281790961:blk_1075311716_1574452 src: /10.0.0.19:35851 dest:
/10.32.1.12:50010
> 2015-07-28 16:03:44,169 INFO org.apache.hadoop.hdfs.server.datanode.DataNode.clienttrace:
src: /10.0.0.20:40176, dest: /10.32.1.12:50010, bytes: 316062, op: HDFS_WRITE, cliID: DFSClient_hb_rs_hbase-rs1,60020,1438092204868_-99326843_35,
offset: 0, srvID: 6c25ffd4-3dc7-4e3a-af56-5cc8aa9220e0, blockid: BP-439084760-10.32.0.180-1387281790961:blk_1075311707_1574443,
duration: 3600482062810
> 2015-07-28 16:03:44,169 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: PacketResponder:
BP-439084760-10.32.0.180-1387281790961:blk_1075311707_1574443, type=LAST_IN_PIPELINE, downstreams=0:[]
terminating
> 2015-07-28 16:11:10,961 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Slow BlockReceiver
write data to disk cost:7884ms (threshold=300ms)
> 2015-07-28 16:11:14,122 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Slow BlockReceiver
write data to disk cost:4362ms (threshold=300ms)
> 2015-07-28 16:11:14,123 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Slow flushOrSync
took 3160ms (threshold=300ms), isSync:false, flushTotalNanos=3160364203ns
> 2015-07-28 16:13:29,968 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Slow BlockReceiver
write data to disk cost:659ms (threshold=300ms)
> 2015-07-28 16:18:33,336 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Receiving
BP-439084760-10.32.0.180-1387281790961:blk_1075311717_1574453 src: /10.0.0.20:41527 dest:
/10.32.1.12:50010
> 2015-07-28 16:18:38,926 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Slow BlockReceiver
write data to disk cost:1767ms (threshold=300ms)
> 2015-07-28 16:28:40,580 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Slow BlockReceiver
write data to disk cost:4099ms (threshold=300ms)
> 
> What could be the cause of this?
> Thank you.
> 
> 

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