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From Vladimir Rodionov <vrodio...@carrieriq.com>
Subject RE: HBase 0.90.4 missing data in production
Date Wed, 02 Nov 2011 22:15:20 GMT
1. The Tool opens cursor to the database (RDBMS) and reads 'rowid's . We keep ROWIDs in RDBMS
2. Then using first N (configurable) rowids it fetches these rows from HBase using HBase bulk
get API.

HBase restart :


on Master node

I do not kill RS - its dangerous :)

Best regards,
Vladimir Rodionov
Principal Platform Engineer
Carrier IQ, www.carrieriq.com
e-mail: vrodionov@carrieriq.com

From: saint.ack@gmail.com [saint.ack@gmail.com] On Behalf Of Stack [stack@duboce.net]
Sent: Wednesday, November 02, 2011 2:56 PM
To: dev@hbase.apache.org
Subject: Re: HBase 0.90.4 missing data in production

On Wed, Nov 2, 2011 at 1:24 PM, Vladimir Rodionov
<vrodionov@carrieriq.com> wrote:
> We can confirm that by running  our own internal tool.

Whats this tool doing Vladimir?  Is it running against HBase API?

> It seems, that we loose only during first restart

How are you doing the restart?  You killing regionservers?  On
restart, are we splitting wal logs or is it a 'clean' restart where no
wals are split?

Can you figure what the missing data is?  Is it all from same one or
two regions?

> Table's TTL = 1 year. There is a slim chance that we load data with timestamps more than
one year behind, but it does not explain the difference
> between total number of rows before and after cluster's restart.

I'd think that if your 'internal tool' found the stuff before the
restart, then this is probably ok (a year could have elapsed over the
restart I suppose but that be odd...)

> All RS are time synched.
> In Master log I do not see any WARN or ERRORs during cluster re-start. In RS logs I see
a lot of:
> 2011-11-02 00:16:07,620 INFO org.apache.hadoop.hbase.regionserver.wal.HLog: Roll /hbase/.logs/us01-ciqps1-grid01.carrieriq.com,60020,1320187507171/us01-ciqps1-grid01.carrieriq.com%3A60020.1320192949451,
entries=76, filesize=68053806. New hlog /hbase/.logs/us01-ciqps1-grid01.carrieriq.com,60020,1320187507171/us01-ciqps1-grid01.carrieriq.com%3A60020.1320192967380
> 2011-11-02 00:16:07,621 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new compressor
> 2011-11-02 00:16:07,621 FATAL org.apache.hadoop.hbase.regionserver.wal.HLog: Could not
append. Requesting close of hlog
> java.io.IOException: Reflection
>        at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:147)
>        at org.apache.hadoop.hbase.regionserver.wal.HLog.sync(HLog.java:1002)
>        at org.apache.hadoop.hbase.regionserver.wal.HLog.append(HLog.java:955)
>        at org.apache.hadoop.hbase.regionserver.HRegion.doMiniBatchPut(HRegion.java:1483)
>        at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1392)
>        at org.apache.hadoop.hbase.regionserver.HRegionServer.multi(HRegionServer.java:2591)
>        at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>        at java.lang.reflect.Method.invoke(Method.java:597)
>        at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:570)
>        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1039)
> Caused by: java.lang.reflect.InvocationTargetException
>        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>        at java.lang.reflect.Method.invoke(Method.java:597)
>        at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:145)
>        ... 10 more
> Caused by: java.lang.NullPointerException
>        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.closeThreads(DFSClient.java:3306)
>        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.sync(DFSClient.java:3216)
>        at org.apache.hadoop.fs.FSDataOutputStream.sync(FSDataOutputStream.java:97)
>        at org.apache.hadoop.io.SequenceFile$Writer.syncFs(SequenceFile.java:944)
>        ... 14 more

Perhaps a newer CDH would have fix for this?

> This is probably not all ERRORS and FATALs I am continuing investigation and will post
my other findings later.

Let us know.


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