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https://issues.apache.org/jira/browse/HBASE-827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622179#action_12622179
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itspeter edited comment on HBASE-827 at 8/13/08 4:37 AM:
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Code to reproduce problem : MyClient.java
was (Author: itspeter):
Code to reproduce problem
> Failed to open scanner in shell after series of action executed
> ---------------------------------------------------------------
>
> Key: HBASE-827
> URL: https://issues.apache.org/jira/browse/HBASE-827
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.3.0
> Environment: Java runtime version : 1.6.0_06
> Hbase version : occured in both 0.2.0 RC2 & 0.3.0 trunk (svn 685494)
> Hbase configuration: run in localhost without hadoop
> Reporter: PeterL in
> Attachments: MyClient.java
>
>
> Background introduction :
> I was intent to implement a large queue-liked structure based on HBase.
> Different from normal queue structure, in my structure, a pop action means
> 'randomly' pick one elements(which is key/value pair from a row) in queue,
> and decrease the queueSize of that queue.
> For performance consideration, I implemented pop action by following steps :
> 1.get the queue size
> 2.random a number between 0~queueSize
> 3.take step2 as a qualifier, get the value of that element, and put the last
> element's value to the original qualifier.
> 4.decrease the queue size. (I didn't delete the last elements since storage
> space is not my primary consideration)
> When the queueSize and number of pop action become large, hbase failed to
> open a scanner. (Even the data of database is correct)
> My program can be split into few steps:
> 1.create a large queue.
> 2.pop until the queue empty
> 3.keep popping the queue
> 4.delete the queue ( delete a row with deleteAll )
> 5.create a small queue with same name (i.e: same row)
> After create a small queue, I checked every key/value in the hbase and found
> it is correct. But when I tried to open a scanner, it got Unknown Exception
> as follows:
> In shell :
> NativeException: org.apache.hadoop.hbase.client.RetriesExhaustedException:
> Trying to contact region server 127.0.0.1:54141 for region
> pleaseCrash,,1218621377152, row '', but failed after 3 attempts.
> Exceptions:
> java.net.SocketTimeoutException: timed out waiting for rpc response
> java.net.SocketTimeoutException: timed out waiting for rpc response
> java.net.SocketTimeoutException: timed out waiting for rpc response
> from org/apache/hadoop/hbase/client/HConnectionManager.java:873:in
> `getRegionServerWithRetries'
> from org/apache/hadoop/hbase/client/HTable.java:1415:in `nextScanner'
> from org/apache/hadoop/hbase/client/HTable.java:1360:in `<init>'
> from org/apache/hadoop/hbase/client/HTable.java:985:in `getScanner'
> from org/apache/hadoop/hbase/client/HTable.java:779:in `getScanner'
> from org/apache/hadoop/hbase/client/HTable.java:706:in `getScanner'
> from sun/reflect/NativeMethodAccessorImpl.java:-2:in `invoke0'
> from sun/reflect/NativeMethodAccessorImpl.java:39:in `invoke'
> from sun/reflect/DelegatingMethodAccessorImpl.java:25:in `invoke'
> from java/lang/reflect/Method.java:597:in `invoke'
> from org/jruby/javasupport/JavaMethod.java:250:in
> `invokeWithExceptionHandling'
> from org/jruby/javasupport/JavaMethod.java:219:in `invoke'
> from org/jruby/javasupport/JavaClass.java:416:in `execute'
> from
> org/jruby/internal/runtime/methods/SimpleCallbackMethod.java:67:in `call'
> from org/jruby/internal/runtime/methods/DynamicMethod.java:78:in
> `call'
> from org/jruby/runtime/CallSite.java:155:in `cacheAndCall'
> ... 128 levels...
> from
> ruby.home.itspeter.hbase_minus_0_dot_3_dot_0_minus_dev.bin.hirbInvokermethod__23$RUBY$startOpt:-1:in
> `call'
> from org/jruby/internal/runtime/methods/DynamicMethod.java:74:in
> `call'
> from org/jruby/internal/runtime/methods/CompiledMethod.java:48:in
> `call'
> from org/jruby/runtime/CallSite.java:123:in `cacheAndCall'
> from org/jruby/runtime/CallSite.java:298:in `call'
> from
> ruby/home/itspeter/hbase_minus_0_dot_3_dot_0_minus_dev/bin//home/itspeter/hbase-0.3.0-dev/bin/../bin/hirb.rb:350:in
> `__file__'
> from
> ruby/home/itspeter/hbase_minus_0_dot_3_dot_0_minus_dev/bin//home/itspeter/hbase-0.3.0-dev/bin/../bin/hirb.rb:-1:in
> `__file__'
> from
> ruby/home/itspeter/hbase_minus_0_dot_3_dot_0_minus_dev/bin//home/itspeter/hbase-0.3.0-dev/bin/../bin/hirb.rb:-1:in
> `load'
> from org/jruby/Ruby.java:512:in `runScript'
> from org/jruby/Ruby.java:432:in `runNormally'
> from org/jruby/Ruby.java:312:in `runFromMain'
> from org/jruby/Main.java:144:in `run'
> from org/jruby/Main.java:89:in `run'
> from org/jruby/Main.java:80:in `main'
> from /home/itspeter/hbase-0.3.0-dev/bin/../bin/hirb.rb:271:in `scan'
> from (hbase):3:in `binding'
> Side effects :
> After scan got time out, I discovered that I also failed to disable the
> table (But not every time), somehow more strange is that table will be
> dropped successfully even disable failed (but not every time).
> System Resources:
> Hbase will rob the cpu...
> In my platform(4-core), cpu usage will raise from 10% -> 50% ..100% ->
> 200% -> 300% ..
> Procedure to reproduce :
> Run the attached java file.
> Try to type "scan 'pleaseCrash'" in hbase shell after program finished.
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