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From John Vines <vi...@apache.org>
Subject Re: why a error about replicated
Date Thu, 22 Jan 2015 16:24:05 GMT
Even if it's not interceptable, we should put in a ticket to hdfs to see
about improving either the message itself or the catchability of it.

On Thu, Jan 22, 2015 at 11:09 AM, Josh Elser <josh.elser@gmail.com> wrote:

> I know I've run into it before (hence why I brought it up) -- I also don't
> remember 100% if there's another "common" reason for having non-zero
> datanodes participating with none excluded.
>
> I'm also not sure how this manifests itself in code, but, assuming it's
> something identifiable, we could try to catch this case and give a better
> error message (and maybe clean up the loads of empty files we create while
> we spin trying to "make" the file).
>
> Mike Drob wrote:
>
>> Has this error come up before? Is there room for us to intercept that
>> stack trace and provide a "check that HDFS has space left" message? This
>> might be especially relevant after we;ve removed the hadoop info box on
>> the monitor.
>>
>> On Thu, Jan 22, 2015 at 8:30 AM, Josh Elser <josh.elser@gmail.com
>> <mailto:josh.elser@gmail.com>> wrote:
>>
>>     How much free space do you still have in HDFS? If hdfs doesn't have
>>     enough free space to make the file, I believe you'll see the car
>>     that you have outlined. The way we create the file will also end up
>>     requiring at least one GB with the default configuration.
>>
>>     Also make sure to take into account any reserved percent of hdfs
>>     when considering the hdfs usage.
>>
>>     On Jan 22, 2015 1:46 AM, "Lu.Qin" <luq.java@gmail.com
>>     <mailto:luq.java@gmail.com>> wrote:
>>
>>
>>         Hi,I have a Accumulo clusters and it run 10 days ,but it show me
>>         many errors now.
>>
>>         2015-01-22 13:04:21,161 [hdfs.DFSClient] WARN : Error while
>> syncing
>>         org.apache.hadoop.ipc.RemoteException(java.io.IOException): File
>>         /accumulo/wal/+9997/226dce4f-4e14-4704-b811-532afe0b0fb3 could
>>         only be replicated to 0 nodes instead
>>           of minReplication (=1).  There are 3 datanode(s) running and
>>         no node(s) are excluded in this operation.
>>                  at
>>         org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.
>> chooseTarget(BlockManager.java:1471)
>>                  at
>>         org.apache.hadoop.hdfs.server.namenode.FSNamesystem.
>> getAdditionalBlock(FSNamesystem.java:2791)
>>                  at
>>         org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.
>> addBlock(NameNodeRpcServer.java:606)
>>                  at
>>         org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSi
>> deTranslatorPB.addBlock(ClientNamenodeProtocolServerSi
>> deTranslatorPB.java:455)
>>                  at
>>         org.apache.hadoop.hdfs.protocol.proto.
>> ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(
>> ClientNamenodeProtocolProtos.java)
>>                  at
>>         org.apache.hadoop.ipc.ProtobufRpcEngine$Server$
>> ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)
>>                  at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928)
>>                  at
>>         org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2013)
>>                  at
>>         org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2009)
>>                  at java.security.AccessController.doPrivileged(Native
>>         Method)
>>                  at javax.security.auth.Subject.doAs(Subject.java:415)
>>                  at
>>         org.apache.hadoop.security.UserGroupInformation.doAs(
>> UserGroupInformation.java:1614)
>>                  at
>>         org.apache.hadoop.ipc.Server$Handler.run(Server.java:2007)
>>
>>                  at org.apache.hadoop.ipc.Client.call(Client.java:1411)
>>                  at org.apache.hadoop.ipc.Client.call(Client.java:1364)
>>                  at
>>         org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.
>> invoke(ProtobufRpcEngine.java:206)
>>                  at com.sun.proxy.$Proxy20.addBlock(Unknown Source)
>>                  at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown
>>         Source)
>>                  at
>>         sun.reflect.DelegatingMethodAccessorImpl.invoke(
>> DelegatingMethodAccessorImpl.java:43)
>>                  at java.lang.reflect.Method.invoke(Method.java:606)
>>                  at
>>         org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(
>> RetryInvocationHandler.java:187)
>>                  at
>>         org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(
>> RetryInvocationHandler.java:102)
>>                  at com.sun.proxy.$Proxy20.addBlock(Unknown Source)
>>                  at
>>         org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslat
>> orPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:368)
>>                  at
>>         org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.
>> locateFollowingBlock(DFSOutputStream.java:1449)
>>                  at
>>         org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.
>> nextBlockOutputStream(DFSOutputStream.java:1270)
>>                  at
>>         org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.
>> run(DFSOutputStream.java:526)
>>
>>         I use hadoop fs to put a file into hadoop ,and it works good,and
>>         the file has 2 replicates.Why accumulo can not work ?
>>
>>         And I see there are so many file only 0B in
>> /accumulo/wal/***/,why?
>>
>>         Thanks.
>>
>>
>>

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