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https://issues.apache.org/jira/browse/HBASE-2208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832639#action_12832639
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Kay Kay commented on HBASE-2208:
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Thanks stack for commiting hbase-2209. Will revisit this with the signature
changes to prevent the copy. Sorry for the separate jira - me just gets nervous
by big patches .
> TableServers # processBatchOfRows - converts from List to [ ] -
> Expensive copy
> ------------------------------------------------------------------------------------
>
> Key: HBASE-2208
> URL: https://issues.apache.org/jira/browse/HBASE-2208
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: Kay Kay
> Fix For: 0.21.0
>
>
> With autoFlush to false and a large write buffer on HTable, when we write
> bulk puts - TableServer # processBatchOfRows , convert the input (List) to
> an [ ] , before sending down the wire.
> With a write buffer as large as 20 MB , that becomes an expensive copy when
> we do - list.toArray(new T[ ] ).
> May be - should we change the wire protocol to support List as well , and
> then revisit this to prevent the bulk copy ?
> {code}
> Batch b = new Batch(this) {
> @Override
> int doCall(final List<Row> currentList, final byte [] row,
> final byte [] tableName)
> throws IOException, RuntimeException {
> *final Put [] puts = currentList.toArray(PUT_ARRAY_TYPE);*
> return getRegionServerWithRetries(new
> ServerCallable<Integer>(this.c,
> tableName, row) {
> public Integer call() throws IOException {
> return server.put(location.getRegionInfo().getRegionName(),
> puts);
> }
> });
> }
> {code}
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