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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-1557) ColumnFamilyStore masking IOException from FileUtils as IOError
Date Fri, 01 Oct 2010 16:40:33 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-1557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-1557:
--------------------------------------

    Attachment: 1557.txt

patch allows snapshot IOException to propagate up to TruncateVerbHandler

> ColumnFamilyStore masking IOException from FileUtils as IOError
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-1557
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1557
>             Project: Cassandra
>          Issue Type: Bug
>          Components: API
>    Affects Versions: 0.7 beta 2
>            Reporter: Aaron Morton
>            Priority: Minor
>             Fix For: 0.7.0
>
>         Attachments: 1557.txt
>
>
> The code in ColumnFamilyStore.snapshot() line 1368 is catching an IOException from the
call to FileUtils.createHardLink() and wrapping it in an IOError. However the code in TruncateVerbHandler:56
is looking for the IOException. This can result  in the client not getting a response to a
truncate() API call. 
> When running on a machine with very low memory I attempted to truncate a CF with few
rows, the following error occurred in the logs.
> ERROR [MUTATION_STAGE:25] 2010-09-29 16:44:39,341 AbstractCassandraDaemon.java (line
88) Fatal exception in thread Thread[MUTATION_STAGE:25,5,main]
> java.io.IOError: java.io.IOException: Cannot run program "ln": java.io.IOException: error=12,
Cannot allocate memory
>         at org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1368)
>         at org.apache.cassandra.db.ColumnFamilyStore.truncate(ColumnFamilyStore.java:1511)
>         at org.apache.cassandra.db.Table.truncate(Table.java:633)
>         at org.apache.cassandra.db.TruncateVerbHandler.doVerb(TruncateVerbHandler.java:54)
>         at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:50)
>         at javautil.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> Caused by: java.io.IOException: Cannot run program "ln": java.io.IOException: error=12,
Cannot allocate memory
>         at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
>         at org.apache.cassandra.io.util.FileUtils.createHardLinkWithExec(FileUtils.java:263)
>         at org.apache.cassandra.io.util.FileUtils.createHardLink(FileUtils.java:229)
>         at org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1360)
>         ... 7 more
> Caused by: java.io.IOException: java.io.IOException: error=12, Cannot allocate memory
>         at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
>         at java.lang.ProcessImpl.start(ProcessImpl.java:65)
>         at java.lang.ProcessBuilder.start(ProcessBuilder.java:453)
>         ... 10 more
> On the client I got this:
>   File "/tech/home//git_home/trojan/trojan/cassandra/Cassandrapy", line 846, in truncate
>     self.recv_truncate()
>   File "/tech/home//git_home/trojan/trojan/cassandra/Cassandra.py", line 857, in recv_truncate
>     (fname, mtype, rseqid) = self._iprot.readMessageBegin()
>   File "/tech/home//git_home/trojan/trojan/thrift/protocol/TBinaryProtocol.py", line
126, in readMessageBegin
>     sz = self.readI32()
> <snip>
>     chunk = self.read(sz-have)
>   File "/tech/home//git_home/trojan/trojan/thrift/transport/TSocket.py", line 92, in
read
>     buff = self.handle.recv(sz)
> timeout: timed out

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