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From steven zhuang <steven.zhuang.1...@gmail.com>
Subject Re: DFS too busy/down? while writing back to HDFS.
Date Tue, 06 Apr 2010 05:57:45 GMT
than, J.D.
          my cluster has the first problem. BTW, dfs.datanode.max.xcievers
means the number of concurrent connections for a datanode right?

On Tue, Apr 6, 2010 at 12:35 PM, Jean-Daniel Cryans <jdcryans@apache.org>wrote:

> Look at your datanode logs around the same time. You probably either have
> this
>
> http://wiki.apache.org/hadoop/Hbase/Troubleshooting#A5
>
> or that
>
> http://wiki.apache.org/hadoop/Hbase/FAQ#A6
>
> Also you see to be putting a fair number of regions on those region
> servers judging by the metrics, do consider setting HBASE_HEAP higher
> than 1GB in conf/hbase-env.sh
>
> J-D
>
> On Mon, Apr 5, 2010 at 8:38 PM, steven zhuang
> <steven.zhuang.1984@gmail.com> wrote:
> > greetings,
> >
> >        while I was importing data into my HBase Cluster, I found one
> > regionserver is down, and by check the log, I found following exceptoin:
> > *EOFException*(during HBase flush memstore to HDFS file? not sure)
> >
> >        seems that it's caused by DFSClient not working, I don't know the
> > exact reason, maybe it's caused by the heavy load on the machine where
> the
> > datanode is residing on, or the disk is full. but I am not sure which DFS
> > node should I check.
> >        has anybody met the same problem? any pointer or hint is
> > appreciated.
> >
> >       The log is as follows:
> >
> >
> > 2010-04-06 03:04:34,065 INFO
> org.apache.hadoop.hbase.regionserver.HRegion:
> > Blocking updates for 'IPC Server handler 20 on 60020' on region
> > hbt2table16,,1270522012397: memstore size 128.0m is >= than blocking
> 128.0m
> > size
> > 2010-04-06 03:04:34,712 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Completed compaction of 34; new storefile is
> > hdfs://rra-03:8887hbase/hbt2table16/2144402082/34/854678344516838047;
> store
> > size is 2.9m
> > 2010-04-06 03:04:34,715 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Compaction size of 35: 2.9m; Skipped 0 file(s), size: 0
> > 2010-04-06 03:04:34,715 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Started compaction of 5 file(s)  into
> > hbase/hbt2table16/compaction.dir/2144402082, seqid=2914432737
> > 2010-04-06 03:04:35,055 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Added
> > hdfs://rra-03:8887hbase/hbt2table16/2144402082/184/1530971405029654438,
> > entries=1489, sequenceid=2914917785, memsize=203.8k, filesize=88.6k to
> > hbt2table16,,1270522012397
> > 2010-04-06 03:04:35,442 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Completed compaction of 35; new storefile is
> > hdfs://rra-03:8887hbase/hbt2table16/2144402082/35/2952180521700205032;
> store
> > size is 2.9m
> > 2010-04-06 03:04:35,445 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Compaction size of 36: 2.9m; Skipped 0 file(s), size: 0
> > 2010-04-06 03:04:35,445 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Started compaction of 4 file(s)  into
> > hbase/hbt2table16/compaction.dir/2144402082, seqid=2914432737
> > 2010-04-06 03:04:35,469 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Added
> > hdfs://rra-03:8887hbase/hbt2table16/2144402082/185/1984548574711437130,
> > entries=2105, sequenceid=2914917785, memsize=286.7k, filesize=123.9k to
> > hbt2table16,,1270522012397
> > 2010-04-06 03:04:35,711 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Added
> > hdfs://rra-03:8887hbase/hbt2table16/2144402082/186/2470661482474884005,
> > entries=3031, sequenceid=2914917785, memsize=414.0k, filesize=179.1k to
> > hbt2table16,,1270522012397
> > 2010-04-06 03:04:35,866 DEBUG
> > org.apache.hadoop.hbase.io.hfile.LruBlockCache: Block cache LRU eviction
> > started.  Attempting to free 20853136 bytes
> > 2010-04-06 03:04:37,010 DEBUG
> > org.apache.hadoop.hbase.io.hfile.LruBlockCache: Block cache LRU eviction
> > completed. Freed 20866928 bytes.  Priority Sizes: Single=17.422821MB
> > (18269152), Multi=150.70126MB (158021728),Memory=0.0MB (0)
> > 2010-04-06 03:04:37,542 INFO org.apache.hadoop.hdfs.DFSClient: Exception
> in
> > createBlockOutputStream java.io.EOFException
> > 2010-04-06 03:04:37,542 INFO org.apache.hadoop.hdfs.DFSClient: Abandoning
> > block blk_-6935524980745310745_1391901
> > 2010-04-06 03:04:37,607 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Completed compaction of 36; new storefile is
> > hdfs://rra-03:8887hbase/hbt2table16/2144402082/36/1570089400510240916;
> store
> > size is 2.9m
> > 2010-04-06 03:04:37,612 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Compaction size of 37: 2.9m; Skipped 0 file(s), size: 0
> > 2010-04-06 03:04:37,612 DEBUG org.apache.hadoop.hbase.regionserver.Store:
> > Started compaction of 4 file(s)  into
> > hbase/hbt2table16/compaction.dir/2144402082, seqid=2914432737
> > 2010-04-06 03:04:37,964 INFO org.apache.hadoop.hdfs.DFSClient: Exception
> in
> > createBlockOutputStream java.io.*EOFException*
> > 2010-04-06 03:04:37,964 INFO org.apache.hadoop.hdfs.DFSClient: Abandoning
> > block blk_2467598422201289982_1391902
> > 2010-04-06 03:04:43,568 INFO org.apache.hadoop.hdfs.DFSClient: Exception
> in
> > createBlockOutputStream java.io.EOFException
> > 2010-04-06 03:04:43,568 INFO org.apache.hadoop.hdfs.DFSClient: Abandoning
> > block blk_-2065206049437531800_1391902
> > 2010-04-06 03:04:44,044 INFO org.apache.hadoop.hdfs.DFSClient: Exception
> in
> > createBlockOutputStream java.io.EOFException
> > 2010-04-06 03:04:44,044 INFO org.apache.hadoop.hdfs.DFSClient: Abandoning
> > block blk_-3059563223628992257_1391902
> > 2010-04-06 03:05:01,588 WARN org.apache.hadoop.hdfs.DFSClient:
> DataStreamer
> > Exception: java.io.IOException: Unable to create new block.
> >    at
> >
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2814)
> >    at
> >
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2078)
> >    at
> >
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2264)
> >
> > 2010-04-06 03:05:01,588 WARN org.apache.hadoop.hdfs.DFSClient: Error
> > Recovery for block blk_-3320281088550177280_1391903 bad datanode[0] nodes
> ==
> > null
> > 2010-04-06 03:05:01,589 WARN org.apache.hadoop.hdfs.DFSClient: Could not
> get
> > block locations. Source file
> > "hbase/hbt2table16/2144402082/187/6358539637638901699" - Aborting...
> > 2010-04-06 03:05:01,589 FATAL
> > org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Replay of hlog
> > required. Forcing server shutdown
> > org.apache.hadoop.hbase.DroppedSnapshotException: region:
> > hbt2table16,,1270522012397
> >    at
> >
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:977)
> >    at
> > org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:846)
> >    at
> >
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:241)
> >    at
> >
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.run(MemStoreFlusher.java:149)
> > Caused by: java.io.EOFException
> >    at java.io.DataInputStream.readByte(DataInputStream.java:250)
> >    at
> org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:298)
> >    at org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:319)
> >    at org.apache.hadoop.io.Text.readString(Text.java:400)
> >    at
> >
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.createBlockOutputStream(DFSClient.java:2870)
> >    at
> >
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2795)
> >    at
> >
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2078)
> >    at
> >
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2264)
> > 2010-04-06 03:05:01,603 INFO
> > org.apache.hadoop.hbase.regionserver.HRegionServer: Dump of metrics:
> > request=0.0, regions=335, stores=590, storefiles=1231,
> > storefileIndexSize=83, memstoreSize=128, compactionQueueSize=1,
> > usedHeap=710, maxHeap=993, blockCacheSize=162178088,
> > blockCacheFree=46200184, blockCacheCount=2483, blockCacheHitRatio=2,
> > fsReadLatency=0, fsWriteLatency=0, fsSyncLatency=0
> > 2010-04-06 03:05:01,604 INFO
> > org.apache.hadoop.hbase.regionserver.MemStoreFlusher:
> > regionserver/10.76.112.214:60020.cacheFlusher exiting
> > 2010-04-06 03:05:01,673 INFO org.apache.hadoop.hbase.regionserver.HLog:
> Roll
> > hbase/.logs/rrb-08.off.tn.ask.com
> ,60020,1268973923999/hlog.dat.1270523052543,
> > entries=483321, calcsize=88970157, filesize=61838598. New hlog
> hbase/.logs/
> > rrb-08.off.tn.ask.com,60020,126897392
> >
>

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