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https://issues.apache.org/jira/browse/HBASE-5329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13200479#comment-13200479
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Lars Hofhansl commented on HBASE-5329:
--------------------------------------
Even if you get 1000 scanners per second you'd have to do that for 1 trillion
(1.000.000.000) years to come into the ballpark of 2^64.
The laws of big numbers are not intuitive.
It is billions times more likely that your power fails, there're random bit
errors, your harddrive dies, or datacenter is hit my a meteorite :).
>From that viewpoint this is in fact not possible, because your hardware is not
>going to live long enough to experience this.
I really think we do not have to change this.
> addRowLock() may allocate duplicate lock id, causing the client to be blocked
> -----------------------------------------------------------------------------
>
> Key: HBASE-5329
> URL: https://issues.apache.org/jira/browse/HBASE-5329
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.90.3
> Environment: Red Hat Enterprise Linux Server release 5.4
> Reporter: liaoxiangui
> Assignee: Zhihong Yu
> Priority: Critical
>
> {code}
> protected long addRowLock(Integer r, HRegion region) throws
> LeaseStillHeldException
> {
> long lockId = -1L;
> lockId = rand.nextLong(); //!!!may generate duplicated
> id，bug?
> String lockName = String.valueOf(lockId);
> rowlocks.put(lockName, r);
> this.leases.createLease(lockName, new RowLockListener(lockName,
> region));
> return lockId;
> }
> {code}
> In addRowLock(),rand may generate duplicated lock id, it may cause
> regionserver throw exception(Leases$LeaseStillHeldException).The client will
> be blocked until old rowlock is released.
> {code}
> 2012-02-03 15:21:50,084 ERROR
> org.apache.hadoop.hbase.regionserver.HRegionServer: Error obtaining row lock
> (fsOk: true)
> org.apache.hadoop.hbase.regionserver.Leases$LeaseStillHeldException
> at
> org.apache.hadoop.hbase.regionserver.Leases.createLease(Leases.java:150)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.addRowLock(HRegionServer.java:1986)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.lockRow(HRegionServer.java:1963)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 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)
> {code}
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