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https://issues.apache.org/jira/browse/HBASE-9140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13730939#comment-13730939
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Elliott Clark commented on HBASE-9140:
--------------------------------------
HBase Git rev:
{code} f760bf88b67f609d3fcf18c317139361ff5ad1df{code}
Table setup:
{code}create 'usertable',{NAME => 'd', VERSIONS => 1,COMPRESSION => 'snappy',
BLOCKCACHE => true}{code}
Ycsb command:
{code}bin/ycsb load hbase -P workloads/workloada -p columnfamily=d -s -threads
32 -p recordcount=40000000{code}
It was an automated YCSB run. I didn't notice it until this morning that the
run was less than half of the normal time. Then looking though the logs I
found the error. It hasn't happened since and I can't get it to reproduce, but
it's weird.
> NPE in AsyncProcess
> -------------------
>
> Key: HBASE-9140
> URL: https://issues.apache.org/jira/browse/HBASE-9140
> Project: HBase
> Issue Type: Bug
> Components: Client
> Affects Versions: 0.95.2
> Environment: 0.95.2 + Hadoop 2.0.4
> Reporter: Elliott Clark
>
> Running YCSB progress got stuck for quite a while and then a Null Pointer
> Exception was thrown:
> {noformat}
> 230 sec: 1266253 operations; 0 current ops/sec;
> 240 sec: 1266253 operations; 0 current ops/sec;
> 250 sec: 1266253 operations; 0 current ops/sec;
> 260 sec: 1266253 operations; 0 current ops/sec;
> 270 sec: 1266253 operations; 0 current ops/sec;
> 280 sec: 1266253 operations; 0 current ops/sec;
> 290 sec: 1266253 operations; 0 current ops/sec;
> 300 sec: 1266253 operations; 0 current ops/sec;
> 310 sec: 1266253 operations; 0 current ops/sec;
> 320 sec: 1266253 operations; 0 current ops/sec;
> 330 sec: 1266253 operations; 0 current ops/sec;
> 340 sec: 1266253 operations; 0 current ops/sec;
> 350 sec: 1266253 operations; 0 current ops/sec;
> 360 sec: 1266253 operations; 0 current ops/sec;
> 370 sec: 1266253 operations; 0 current ops/sec;
> 380 sec: 1266253 operations; 0 current ops/sec;
> 390 sec: 1266253 operations; 0 current ops/sec;
> Exception in thread "Thread-26" java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.client.AsyncProcess.findDestLocation(AsyncProcess.java:288)
> at
> org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:233)
> at
> org.apache.hadoop.hbase.client.HTable.backgroundFlushCommits(HTable.java:811)
> at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:1192)
> at com.yahoo.ycsb.db.HBaseClient.cleanup(HBaseClient.java:106)
> at com.yahoo.ycsb.DBWrapper.cleanup(DBWrapper.java:73)
> at com.yahoo.ycsb.ClientThread.run(Client.java:307)
> 400 sec: 1266253 operations; 0 current ops/sec; [UPDATE
> AverageLatency(us)=1341720] [INSERT AverageLatency(us)=197941421.07] [CLEANUP
> AverageLatency(us)=1342113]
> Exception in thread "Thread-16" java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.client.AsyncProcess.findDestLocation(AsyncProcess.java:288)
> at
> org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:233)
> at
> org.apache.hadoop.hbase.client.HTable.backgroundFlushCommits(HTable.java:811)
> at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:1192)
> at com.yahoo.ycsb.db.HBaseClient.cleanup(HBaseClient.java:106)
> at com.yahoo.ycsb.DBWrapper.cleanup(DBWrapper.java:73)
> at com.yahoo.ycsb.ClientThread.run(Client.java:307)
> 410 sec: 1266253 operations; 0 current ops/sec; [INSERT
> AverageLatency(us)=208462580.75]
> {noformat}
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