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From steven zhuang <steven.zhuang.1...@gmail.com>
Subject DFS too busy/down? while writing back to HDFS.
Date Tue, 06 Apr 2010 03:38:12 GMT
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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