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https://issues.apache.org/jira/browse/HBASE-11707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16071456#comment-16071456
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Hudson commented on HBASE-11707:
--------------------------------
SUCCESS: Integrated in Jenkins build HBase-Trunk_matrix #3294 (See
[https://builds.apache.org/job/HBase-Trunk_matrix/3294/])
HBASE-11707 Using Map instead of list in FailedServers of RpcClient (Liu
(stack: rev f1b97a6aa0206636cdfeafaad70af914e91979d3)
* (edit)
hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/FailedServers.java
> Using Map instead of list in FailedServers of RpcClient
> -------------------------------------------------------
>
> Key: HBASE-11707
> URL: https://issues.apache.org/jira/browse/HBASE-11707
> Project: HBase
> Issue Type: Improvement
> Components: Client
> Reporter: Liu Shaohui
> Assignee: Liu Shaohui
> Priority: Minor
> Fix For: 2.0.0
>
> Attachments: HBASE-11707.master.001.patch, HBASE-11707-trunk-v1.diff,
> HBASE-11707-trunk-v2.diff
>
>
> Currently, FailedServers uses a list to record the black list of servers and
> iterate the list to check if a server is in list. It's not efficient when the
> list is very large. And the list is not thread safe for the add and iteration
> operations.
> RpcClient.java#175
> {code}
> // iterate, looking for the search entry and cleaning expired entries
> Iterator<Pair<Long, String>> it = failedServers.iterator();
> while (it.hasNext()) {
> Pair<Long, String> cur = it.next();
> if (cur.getFirst() < now) {
> it.remove();
> } else {
> if (lookup.equals(cur.getSecond())) {
> return true;
> }
> }
> {code}
> A simple change is to change this list to ConcurrentHashMap.
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