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https://issues.apache.org/jira/browse/HBASE-6334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408357#comment-13408357
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Gregory Chanan commented on HBASE-6334:
---------------------------------------
It's hopefully coming. Changes work great against 0.90, but in 0.92+ I'm
getting the following errors:
{code}
Exception in thread "Thread-4" java.lang.NoClassDefFoundError:
org/apache/hadoop/hbase/MultithreadedTestUtil
at
org.apache.hadoop.hbase.MultithreadedTestUtil$TestContext.threadFailed(MultithreadedTestUtil.java:82)
at
org.apache.hadoop.hbase.MultithreadedTestUtil$TestThread.run(MultithreadedTestUtil.java:123)
Caused by: java.lang.ClassNotFoundException:
org.apache.hadoop.hbase.MultithreadedTestUtil
at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 2 more
Caused by: java.io.FileNotFoundException:
/home/gchanan/workspace/hbasecdh4/target/test-classes/org/apache/hadoop/hbase/MultithreadedTestUtil.class
(Too many open files)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:120)
at
sun.misc.URLClassPath$FileLoader$1.getInputStream(URLClassPath.java:1005)
at sun.misc.Resource.cachedInputStream(Resource.java:61)
at sun.misc.Resource.getByteBuffer(Resource.java:144)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:256)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
... 7 more
{code}
It looks like I'm perhaps creating too many files with my constant flushes. I
can fix those errors by compacting more frequently, but that reduces the
frequency of failures when it should fail (i.e. without HBASE-4195).
> TestImprovement for TestHRegion.testWritesWhileGetting
> ------------------------------------------------------
>
> Key: HBASE-6334
> URL: https://issues.apache.org/jira/browse/HBASE-6334
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.90.6, 0.92.1, 0.94.0, 0.96.0
> Reporter: Gregory Chanan
> Assignee: Gregory Chanan
> Priority: Minor
>
> Two improvements:
> 1. I was running testWritesWhileGetting on 0.90.6 (which lacks HBASE-4195)
> and I couldn't get the 20% failures mentioned in the JIRA. It was more like
> 1%. So I increased the flush frequency and it failed most of the time.
> 2. The check on failure is wrong:
> {code}
> assertEquals(previousKV.getValue(), thisValue);
> {code}
> Since this is a byte array, we should use Bytes.compareTo.
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