[jira] [Created] (HBASE-21651) when splitting hlog，occurred exception

["Bo Cui (JIRA)" <ji...@apache.org>]

Bo Cui created HBASE-21651:
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             Summary: when splitting hlog，occurred exception 
                 Key: HBASE-21651
                 URL: https://issues.apache.org/jira/browse/HBASE-21651
             Project: HBase
          Issue Type: Bug
    Affects Versions: 2.1.0, 1.3.1
            Reporter: Bo Cui


if hlog contains too many regions,when hlog splits, WALSplitter will open a discovered.edits(FSDataOutputStream) for each region, 
{code:title=WALSplitter.java|borderStyle=solid}
protected Map<byte[], SinkWriter> writers = Collections
        .synchronizedMap(new TreeMap<byte[], SinkWriter>(Bytes.BYTES_COMPARATOR));
{code}
but datanode has a limit (dfs.datanode.max.transfer.threads), which will cause splithlog to be very slow,even failed.


solution:add an max openEdits value（a configuration）, when openEdits exceeds this value, the oldest FSDataOutputStream will be closed



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