[HBASE-17344] The regionserver web UIs miss the coprocessors of RegionServerCoprocessorHost.

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.3.0, 1.3.1, 2.0.0
• Fix Version/s: 1.4.0, 2.0.0
• Hadoop Flags: Reviewed
• Assignee: Chia-Ping Tsai
• Reporter: Chia-Ping Tsai
• Created: 20/Dec/16 09:17
• Updated: 20/Dec/16 20:13
• Resolved: 20/Dec/16 16:55

Description

The critical code is shown below.

HRegionServer.java

  public String[] getRegionServerCoprocessors() {
    TreeSet<String> coprocessors = new TreeSet<String>();
    try {
      coprocessors.addAll(getWAL(null).getCoprocessorHost().getCoprocessors());
    } catch (IOException exception) {
      LOG.warn("Exception attempting to fetch wal coprocessor information for the common wal; " +
          "skipping.");
      LOG.debug("Exception details for failure to fetch wal coprocessor information.", exception);
    }
    Collection<Region> regions = getOnlineRegionsLocalContext();
    for (Region region: regions) {
      coprocessors.addAll(region.getCoprocessorHost().getCoprocessors());
      try {
        coprocessors.addAll(getWAL(region.getRegionInfo()).getCoprocessorHost().getCoprocessors());
      } catch (IOException exception) {
        LOG.warn("Exception attempting to fetch wal coprocessor information for region " + region +
            "; skipping.");
        LOG.debug("Exception details for failure to fetch wal coprocessor information.", exception);
      }
    }
    return coprocessors.toArray(new String[coprocessors.size()]);
  }

A case is that the the JMXListener always disappears on the rs web.