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https://issues.apache.org/jira/browse/ZOOKEEPER-486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784717#action_12784717
 ] 

Flavio Paiva Junqueira commented on ZOOKEEPER-486:
--------------------------------------------------

Here is the log output for the failing test:

{noformat}
2009-12-02 09:46:22,952 - INFO  - [main:bookieclientt...@198] - Starting no 
ledger test
2009-12-02 09:46:22,956 - INFO  - [Thread-4:bookieclienttes...@75] - Capacity 
16, 0
2009-12-02 09:46:22,957 - INFO  - [Thread-4:bookieclienttes...@83] - Received 0
2009-12-02 09:46:23,001 - ERROR - [SyncThread:bookie$lastlogm...@295] - 
Problems writing to 
/var/folders/iq/iqmyL+XiGjqE2AjRkKTe-E+++TI/-Tmp-/bookie2550661167481866393test/lastMark
java.io.FileNotFoundException: 
/var/folders/iq/iqmyL+XiGjqE2AjRkKTe-E+++TI/-Tmp-/bookie2550661167481866393test/lastMark
 (No such file or directory)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
        at 
org.apache.bookkeeper.bookie.Bookie$LastLogMark.rollLog(Bookie.java:290)
        at org.apache.bookkeeper.bookie.Bookie$SyncThread.run(Bookie.java:116)
2009-12-02 09:46:23,002 - FATAL - [Thread-3:boo...@375] - Bookie thread exiting
java.lang.InterruptedException
        at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:1899)
        at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1934)
        at 
java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
        at org.apache.bookkeeper.bookie.Bookie.run(Bookie.java:341)
{noformat}

and the assert statement that fails:

{noformat}
Testcase: testNoLedger took 0.132 sec
        FAILED
expected:<1> but was:<2>
junit.framework.AssertionFailedError: expected:<1> but was:<2>
        at 
org.apache.bookkeeper.test.BookieClientTest.testNoLedger(BookieClientTest.java:204)
{noformat}

It seems to me that the problem is that the bookie is not processing the 
FileNotFoundException properly. It should send a ENOLEDGER value back. 

> Improve bookie performance for large number of ledgers
> ------------------------------------------------------
>
>                 Key: ZOOKEEPER-486
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-486
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: contrib-bookkeeper
>            Reporter: Flavio Paiva Junqueira
>            Assignee: Benjamin Reed
>         Attachments: ZOOKEEPER-486.patch
>
>
> If we write simultaneously to a large number of ledgers on a bookie, then 
> performance drops significantly due to more seeks on the ledger device. In 
> such cases, we should be clustering ledgers into files to reduce the number 
> of seeks, and performing sequential writes on each file. Clustering ledgers 
> will impact read performance, so we would to have a knob to control such a 
> feature.

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